共查询到20条相似文献,搜索用时 15 毫秒
1.
K.-H. Mittenzwey A. A. Gitel'Son A. A. Lopatchenko B. L. Sukhorukov T. Voigt 《International Review of Hydrobiology》1988,73(1):61-72
When using in-situ methods such as the use of spectrometers aboard a ship, aircraft or satellites to estimate suspended matter (especially phytoplankton concentrations) in waters it is necessary to know the corresponding correlations between the matter concerned and the spectral reflectance R(Λ) or colour indices R(Λi)/R(Λj). Therefore, ship-borne experiments were carried out on mesotrophic and eutrophic waters. The following parameters were measured: reflectance at the wavelengths 450, 550, 670, 705 nm, Secchidisk transparency, chlorophyll-a concentration, fluorescence, extinction, and scattering. Significant correlations (0.92<r2<0.99) were found between chlorophyll-a concentration (10 to 360 μg/l) and the reflectance ratios R(705)/(670), R(705)/R(550), (R(705) -R(670))/R(550). At these concentrations the estimation of chlorophyll-a by means of R(705)/R(670) appears to be more accurate than by the fluorescence method. When developing methods for estimating seston concentrations the use of R(705) is recommended. 相似文献
2.
Roderick C. Jones Michael G. Gardiner Vicki-Anne Tolhurst 《Inorganica chimica acta》2010,363(1):77-295
Ligands containing the 2-organochalcogenomethylpyridine motif with substituents in the 4- or 6-position of the pyridyl ring, R4,R6-pyCH2ER1 [R4 = R6 = H, ER1 = SMe (1), SeMe (2), SPh (6), SePh (7); R4 = Me, R6 = H, ER1 = SMe (3), SPh (8), SePh (9); R4 = H, R6 = Me, ER1 = SMe (4), SPh (10), SePh (11); R4 = H, R6 = Ph, ER1 = SMe (5), SPh (12), SePh (13)] are obtained on the reaction of R4,R6-pyMe with LiBun followed by R1EER1. On reaction with PdCl2(NCMe)2, the ligands with a 6-phenyl substituent form cyclopalladated species PdCl{6-(o-C6H4)pyCH2ER1-C,N,E} (5a, 12a, 13a) with the structure of 13a (ER1 = SePh) confirmed by X-ray crystallography; other ligands form complexes of stoichiometry PdCl2(R4,R6-pyCH2ER1). Complexes with R6 = H are monomeric with N,E-bidentate configurations, confirmed by structural analysis for 3a (R4 = Me, ER1 = SMe), 7a (R4 = H, ER1 = SePh) and 9a (R4 = Me, ER1 = SePh). Two of the 6-methyl substituted complexes examined by X-ray crystallography are oligomeric with trans-PdCl2(N,E) motifs and bridging ligands, trimeric [PdCl2(μ-6-MepyCH2SPh-N,S)]3 (10a) and dimeric [PdCl2(μ-6-MepyCH2SePh-N,Se)]2 (11a). This behaviour is attributed to avoidance of the Me···Cl interaction that would occur in the cis-bidentate configuration if the pyridyl plane had the same orientation with respect to the coordination plane as observed for 3a, 7a and 9a [dihedral angles 8.0(2)-16.8(2)°]. When examined as precatalysts for the Mizoroki-Heck reaction of n-butyl acrylate with aryl halides in N,N-dimethylacetamide at 120 °C, the complexes exhibit the anticipated trends in yield (ArI > ArBr > ArCl, higher yield for electron withdrawing substituents in 4-RC6H4Br and 4-RC6H4Cl). The most active precatalysts are PdCl2(R4-pyCH2SMe-N,S) (R = H (1a), Me (3a)); complexes of the selenium containing ligands exhibit very low activity. For closely related ligands, the changes SMe to SPh, 6-H to 6-Me, and 6-H to 6-Ph lead to lower activity, consistent with involvement of both the pyridyl and chalcogen donors in reactions involving aryl bromides. The precatalyst PdCl2(pyCH2SMe-N,S) (1a) exhibits higher activity for the reaction of aryl chlorides in Bun4NCl at 120 °C as a solvent under non-aqueous ionic liquid (NAIL) conditions. 相似文献
3.
The repellent activity of the essential oil of the catmint plant, Nepeta cataria (Lamiaceae), and the main iridoid compounds (4aS,7S,7aR) and (4aS,7S,7aS)-nepetalactone, was assessed against (i) major Afro-tropical pathogen vector mosquitoes, i.e. the malaria mosquito, Anopheles gambiae s.s. and the Southern house mosquito, Culex quinquefasciatus, using a World Health Organisation (WHO)-approved topical application bioassay (ii) the brown ear tick, Rhipicephalus appendiculatus, using a climbing repellency assay, and (iii) the red poultry mite, Dermanyssus gallinae, using field trapping experiments. Gas chromatography (GC) and coupled GC-mass spectrometry (GC-MS) analysis of two N. cataria chemotypes (A and B) used in the repellency assays showed that (4aS,7S,7aR) and (4aS,7S,7aS)-nepetalactone were present in different proportions, with one of the oils (from chemotype A) being dominated by the (4aS,7S,7aR) isomer (91.95% by GC), and the other oil (from chemotype B) containing the two (4aS,7S,7aR) and (4aS,7S,7aS) isomers in 16.98% and 69.83% (by GC), respectively. The sesquiterpene hydrocarbon (E)-(1R,9S)-caryophyllene was identified as the only other major component in the oils (8.05% and 13.19% by GC, respectively). Using the topical application bioassay, the oils showed high repellent activity (chemotype A RD50 = 0.081 mg cm−2 and chemotype B RD50 = 0.091 mg cm−2) for An. gambiae comparable with the synthetic repellent DEET (RD50 = 0.12 mg cm−2), whilst for Cx. quinquefasciatus, lower repellent activity was recorded (chemotype A RD50 = 0.34 mg cm−2 and chemotype B RD50 = 0.074 mg cm−2). Further repellency testing against An. gambiae using the purified (4aS,7S,7aR) and (4aS,7S,7aS)-nepetalactone isomers revealed overall lower repellent activity, compared to the chemotype A and B oils. Testing of binary mixtures of the (4aS,7S,7aR) and (4aS,7S,7aS) isomers across a range of ratios, but all at the same overall dose (0.1 mg), revealed not only a synergistic effect between the two, but also a surprising ratio-dependent effect, with lower activity for the pure isomers and equivalent or near-equivalent mixtures, but higher activity for non-equivalent ratios. Furthermore, a binary mixture of (4aS,7S,7aR) and (4aS,7S,7aS) isomers, in a ratio equivalent to that found in chemotype B oil, was less repellent than the oil itself, when tested at two doses equivalent to 0.1 and 0.01 mg chemotype B oil. The three-component blend including (E)-(1R,9S)-caryophyllene at the level found in chemotype B oil had the same activity as chemotype B oil. In a tick climbing repellency assay using R. appendiculatus, the oils showed high repellent activity comparable with data for other repellent essential oils (chemotype A RD50 = 0.005 mg and chemotype B RD50 = 0.0012 mg). In field trapping assays with D. gallinae, addition of the chemotype A and B oils, and a combination of the two, to traps pre-conditioned with D. gallinae, all resulted in a significant reduction of D. gallinae trap capture. In summary, these data suggest that although the nepetalactone isomers have the potential to be used in human and livestock protection against major pathogen vectors, intact, i.e. unfractionated, Nepeta spp. oils offer potentially greater protection, due to the presence of both nepetalactone isomers and other components such as (E)-(1R,9S)-caryophyllene. 相似文献
4.
Adriana Lorenzotti Claudio Pettinari Brian W. Skelton 《Inorganica chimica acta》2005,358(11):3190-3200
New silver(I) acylpyrazolonate derivatives [Ag(Q)], [Ag(Q)(PR3)]2 and [Ag(Q)(PR3)2] (HQ = 1-R1-3-methyl-4-R2(CO)pyrazol-5-one, HQBn = R1 = C6H5, R2 = CH2C6H5; HQCHPh2 = R1 = C6H5, R2 = CH(C6H5)2; HQnPe = R1 = C6H5, R2 = CH2C(CH3)3; HQtBu = R1 = C6H5, R2 = C(CH3)3; HQfMe = R1 = C6H4-p-CF3, R2 = CF3; HQfEt = R1 = C6H5, R2 = CF2CF3; R = Ph or iBu) have been synthesized and characterized in the solid state and solution. The crystal structure of 1-(4-trifluoromethylphenyl)-3-methyl-5-pyrazolone, the precursor of proligand HQfMe and of derivatives [Ag(QnPe)(PPh3)2] and [Ag(QnPe)(PiBu3)]2 have been investigated. [Ag(QnPe)(PPh3)2] is a mononuclear compound with a silver atom in a tetrahedrally distorted AgO2P2 environment, whereas [Ag(QnPe)(PiBu3)]2 is a dinuclear compound with two O2N-exotridentate bridging acylpyrazolonate ligands connecting both silver atoms, their coordination environment being completed by a phosphine ligand. 相似文献
5.
Bimetallic copper(II) and zinc(II) complexes of acyclic Schiff base ligands derived from amino acids
Abdessamad Arbaoui Noelia M. Sanchez-Ballester David L. Hughes 《Inorganica chimica acta》2011,365(1):96-102
The acyclic Schiff-base ligands (2-(OH)-5-(R3)C6H2-1,3-(HCNC(R1)(R2)CO2H), derived from the dialdehyde 2-hydroxy-5-R-1,3-benzenedicarboxaldehyde (R = Me or t-Bu) and two equivalents of the amino acids glycine, 2,2-diphenylglycine or phenylalanine, have been reacted with the metal acetates M(OAc)2 (M = Cu, Zn) in the presence of triethylamine, affording the complexes [HNEt3][M2(CH3CO2)2(2-(O)-5-(t-Bu)C6H2-1,3-(HCNC(R1)(R2)CO2)2] (M = Cu, R1 = R2 = C6H5, R3 = Me (1); M = Zn, R1 = R2 = H, R3 = t-Bu (2); M = Zn, R1 = R2 = C6H5, R3 = t-Bu (3); M = Zn, R1 = H, R2 = CH2C6H5, R3 = t-Bu (4)) in good yields. The crystal structures of 1·MeCN, 2·, 3·2MeOH, and 4·3MeOH have been determined. 相似文献
6.
Sergey S. Karlov Anastasia A. Selina Yuri F. Oprunenko Victor A. Tafeenko Judith A.K. Howard 《Inorganica chimica acta》2007,360(2):563-578
A new series of mono- and diphenylsubstituted silatranes and boratranes N(CH2CH2O)2(CHR3CR1R2O)MZ (M = Si, Z = CH2Cl, CCPh, H, OMenth, R1, R2, R3 = H, Ph; M = B, Z = nothing, R1, R2, R3 = H, Ph) have been synthesized. Both transalkoxylation and stepwise modification of a preformed metallatrane skeleton were used. The chloromethyl derivatives N(CH2CH2O)2(CHRCHRO)SiCH2Cl (R = H, Ph) react with tert-BuOK under intramolecular cycle expansion to give 1-tert-butoxy-2-carba-3-oxahomosilatranes N(CH2CH2O)(CH2CH2OCH2)(CHRCHRO)SiOtBu (R = H, Ph). The treatment of boratranes N(CH2CH2O)2(CH2CR1R2O)B (R1,R2 = H, Ph) with triflic acid and trimethylsilyl triflate results in the products of electrophilic attack at the nitrogen atom. The molecular structures of four silatranes and one boratrane bearing phenyl groups in the atrane skeleton were determined by the X-ray structure analysis. 相似文献
7.
The reaction between pyridine-4-hydroxy-2,6-dicarboxylic acid (cdaH2) and Cu(NO3)2 · 3H2O afford products that depend on the reaction conditions applied. In presence of excess of aqueous pyridine (1:2 v/v), equimolar amounts of the reactants form {[Cu(cda)(py)3]2 · 5H2O}n (1). In this complex, dimeric water clusters are H-bonded to carboxylate O atoms forming both left- and right-handed helices. These helices are further H-bonded to form a tubular coordination polymer. It crystallizes in the monoclinic space group P21/a with a = 14.235(5), b = 23.097(4), c = 15.542(6) Å, β = 114.392(5)°, V = 4654(2) Å3, Z = 4, R1 = 0.0422, wR2 = 0.0992, S = 0.899. When pyridine is used in place of aqueous pyridine, a new coordination polymer, {Cu(cda)(py)}n(2) is formed that crystallizes in the monoclinic space group P21/c with a = 12.391(5), b = 12.770(5), c = 7.135(5) Å, β = 95.155(5)°, V = 1124(1) Å3, Z = 4, R1 = 0.0415, wR2 = 0.0882, S = 1.190. The structure of 2 consists of carboxylate-bridged [Cu(cda)(py)] units extending as a zigzag infinite chain where each metal ion shows square-pyramidal geometry. Variable temperature magnetic susceptibility measurements in the temperature range, 2-300 K for 2 is also reported. 相似文献
8.
Two new one-dimensional azido-bridged chiral copper(II) coordination polymers, [(μ-1,1,3-N3)2{Cu2(R-L)2(N3)2}]n (1) (R-L = R-2-(N-(2-hydroxybutyl)carbaldimino) pyridine) and [(μ-1,1,3-N3)2{Cu2(S-L)2(N3)2}]n (2) (S-L = S-2-(N-(2-hydroxybutyl)carbaldimino)pyridine) have been synthesized and structurally characterized. Complexes 1 and 2 crystallize in the monoclinic chiral space group P21. For 1, with a = 6.9565(17) Å, b = 20.675(5) Å, c = 9.859(2) Å, β = 105.944(5)° and Z = 2. In the case of compound 2, a = 6.9650(17) Å, b = 20.705(5) Å, c = 9.878(2) Å, β = 105.941(4)° and Z = 2. Both complexes consist of one-dimensional chiral structures in which the copper(II) ions with a distorted octahedral geometry are interlinked by the unusual μ-1,1,3 azido ligands. Circular dichroism spectra demonstrate that 1 and 2 are a pair of enantiomers. Their magnetic properties have been studied. Fitting of the susceptibility data for 1 and 2 using the Bleany-Bowers expression derived from the isotropic spin-exchange Hamiltonian H = −2JS1S2 leads to the parameters g = 2.21, J = −2.06 cm−1, zJ′ = −0.0309 cm−1 and R = 4.0 × 10−4. 相似文献
9.
Three kinds of copper(II) azide complexes have been synthesised in excellent yields by reacting Cu(ClO4)2 · 6H2O with N,N-bis(2-pyridylmethyl)amine (L1); N-(2-pyridylmethyl)-N′,N′-dimethylethylenediamine (L2); and N-(2-pyridylmethyl)-N′,N′-diethylethylenediamine (L3), respectively, in the presence of slight excess of sodium azide. They are the monomeric Cu(L1)(N3)(ClO4) (1), the end-to-end diazido-bridged Cu2(L2)2(μ-1,3-N3)2(ClO4)2 (2) and the single azido-bridged (μ-1,3-) 1D chain [Cu(L3)(μ-1,3-N3)]n(ClO4)n (3). The crystal and molecular structures of these complexes have been solved. The variable temperature magnetic moments of type 2 and type 3 complexes were studied. Temperature dependent susceptibility for 2 was fitted using the Bleaney-Bowers expression which led to the parameters J = −3.43 cm−1 and R = 1 × 10−5. The magnetic data for 3 were fitted to Baker’s expression for S = 1/2 and the parameters obtained were J = 1.6 cm−1 and R = 3.2 × 10−4. Crystal data are as follows. Cu(L1)(N3)(ClO4): Chemical formula, C12H13ClN6O4Cu; crystal system, monoclinic; space group, P21/c; a = 8.788(12), b = 13.045(15), c = 14.213(15) Å; β = 102.960(10)°; Z = 4. Cu(L2)(μ-N3)(ClO4): Chemical formula, C10H17ClN6O4Cu: crystal system, monoclinic; space group, P21/c; a = 10.790(12), b = 8.568(9), c = 16.651(17) Å; β = 102.360(10)°; Z = 4. [Cu(L3)(μ-N3)](ClO4): Chemical formula, C12H21ClN6O4Cu; crystal system, monoclinic; space group, P21/c; a = 12.331(14), b = 7.804(9), c = 18.64(2) Å; β = 103.405(10)°; Z = 4. 相似文献
10.
Substituted salicylaldehydes [C6HR1R2R3(CHO)(OH)] react with CoMe3(PMe3)3 to afford 6-coordinate (cis-dimethyl)(2-formyl-phenolato)trans-bis(trimethylphosphine)cobalt(III) compounds Co[C6HR1R2R3(CHO)(O)Me2](PMe3)2 (1: R1 = H; R2 = Me; R3 = tert-Bu; 2: R1, R2 = C6H4; R3 = H). Accordingly, substituted enolated malonic dialdehydes (CHO-CR4CR5-OH) react with CoMe3(PMe3)3 to afford 6-coordinate (cis-dimethyl)(2-formyl-enolato)trans-bis(trimethylphosphine)cobalt(III) compounds Co[(CHO-CR4CR5-O)(Me)2](PMe3)2 (3: R4, R5 = (CH2)2C6H4; 4: R4 = R5 = C6H5). In the molecular structure of 4, the cobalt atom is centred in an octahedral coordination geometry brought about by a six-membered chelate ring (O:O-ligand), cis-dimethyl and trans-trimethylphosphine groups. A reaction mechanism is suggested. 相似文献
11.
Mu L Aguiar J Ardati A Cao B Gardner CJ Gillespy T Harris K Lim S Marcus R Morize I Parkar A Stefany D Li Y Vaz RJ Cirovic DA 《Bioorganic & medicinal chemistry letters》2011,21(1):66-75
A Comparative Molecular Similarity Indices Analysis (CoMSIA) was performed for 2,6-substituted-4-monosubstituted aminopyrimidine antagonists of prostaglandin D2 receptor (DP). Both two-component (Q2 = 0.63, R2 = 0.82, SEE = 0.47 pIC50) and three-component (Q2 = 0.70, R2 = 0.91, SEE = 0.36 pIC50) CoMSIA models were established. Two hydrogen-bond acceptors with spatial separation of about 8 Å are shown as optimal for binding. A large hydrophobic center that separates the two acceptors confers to the potency of the 2,6-substituted-4-monosubstituted aminopyrimidine. The models were used to predict IC50 values for compounds which had functional groups different from those in the training set. 相似文献
12.
Ring coupled bimetallic derivatives (μ-η5:5-C5H4C5H4)[Nb(CO)4]2 and [μ-CH2(η5-C5H4)2][M(CO)4]2, where M = Nb and Ta have been prepared. The molecular structures of the latter two compounds have been determined: , triclinic, , a = 8.028(2) Å, b = 11.414(1) Å, c = 12.711(2) Å, α = 75.020(8)°, β = 80.34(2)°, γ = 79.46(2)°, V = 1097.3(4) Å3, Z = 2, R(F) = 2.79%; [μ-CH2(η5-C5H4)2][Ta(CO)4]2, triclinic, , a = 7.815(3) Å, b = 10.275(4) Å, c = 13.135(4) Å, α = 104.25(3)°, β = 100.26(4)°, γ = 96.86(3)°, V = 991.2(6) Å3, Z = 2, R(F) = 3.00%. 相似文献
13.
Stefanus Otto 《Inorganica chimica acta》2010,363(13):3316-3320
The substitution behaviour of [PtCl(R)(COD)] (R− = Me and Fc) complexes, by the stepwise addition of phosphine ligands, L (L = PPh3, PEt3 and P(NMe2)3), were investigated in situ by 1H and 31P NMR spectroscopy. Addition of less than two equivalents of the phosphine ligand results in the formation of dimeric molecules with the general formula trans-[Pt(R)(μ-Cl)(L)]2 for the sterically demanding systems where R− = Me/L = P(NMe2)3 and R− = Fc/L = PEt3, PPh3 and P(NMe2)3 while larger quantities resulted in cis- and trans mixtures of mononuclear complexes being formed. In the case of the relatively small steric demanding, strongly coordinating, PEt3 ligand the trans-[PtCl(R)(PEt3)2] mononuclear complexes were exclusively observed in both cases. The crystal structures of the two substrates, [PtCl(R)(COD)] (R− = Me or Fc), as well as the cis-[PtCl(Fc)(PPh3)2] substitution product are reported. 相似文献
14.
Reaction of the rhenium(IV) compound, [Bu4N]2ReCl4ox, with the highly unsaturated tetraazabismacrocyclic copper(II) complex cation [CuCuL]4+ (L = 6,13-Bis(dodecylaminomethylidene)-1,4,8,11-tetraazacyclotetradeca-4,7,11,14-tetraene) produced a new kind of heterobimetallic compound: [CuCuL][ReCl4ox]2 · 2DMF in which [ReCl4ox]2− anions and [CuCuL]4+ cations are linked by electrostatic forces. The crystal structure of this compound was determined at 173(2) K. It crystallizes triclinic, space group , with a = 9.441(4), b = 11.032(5), c = 15.261(7) Å, α = 89.05(1)°, β = 88.93(1)°, γ = 77.09(1)°, Z = 1, R1 = 0.0557, wR2 = 0.1332. The magnetic behavior of this compound has been investigated over the temperature range 1.72-300 K. The compound behaves as a ferrimagnetic CuIIReIV bimetallic, chain with intrachain antiferromagnetic coupling. 相似文献
15.
Maximilian N. Kopylovich Vadim Yu. Kukushkin Matti Haukka 《Inorganica chimica acta》2009,362(9):2994-2998
The reaction between Zn(OAc)2 · 2H2O (1) and the 3-iminoisoindolin-1-ones H2NCNC(O)C6R1R2R3R4 (R1-R4 = H 2; R1, R4 = H, R2, R3 = Cl 3; R1, R3, R4 = H, R2 = Me 4) in EtCN at 70 °C for ca. 12 h affords the novel family of complexes [Zn{H2NCNC(O)C6R1R2R3R4}2(OAc)2] (R1-R4 = H 5; R1, R4 = H, R2, R3 = Cl 6; R1, R3, R4 = H, R2 = Me 7) in excellent (90% and 93% for 5 and 6, correspondingly) to good (64% for 7) yields. The isolated compounds were characterized by elemental analyses (C, H, N), IR, NMR and ESI+-MS. X-ray diffraction data for 2 and 5 indicate that both free (2) and ligated (5) 3-iminoisoindolin-1-ones exist in the zwitterionic form. 相似文献
16.
Hicham El Bakouri José Usero José Morillo Abdelhamid Ouassini 《Bioresource technology》2009,100(18):4147-4155
The adsorption behavior of drin pesticides from aqueous solution onto acid treated olive stones (ATOS) was investigated using stir bar sorptive extraction and gas chromatography coupled with mass spectroscopy. The effects of sorbent particle size, adsorbent dose, contact time, concentration of pesticide solution and temperature on the adsorption processes were systematically studied in batch shaking sorption experiments. Maximum removal efficiency (94.8%) was reached for aldrin (0.5 mg L−1) using the fraction 63–100 μm of ATOS (solid/liquid ratio: 1 g L−1). Experimental data were modeled by Langmuir, Freundlich and Dubinin–Radushkevich (D–R) isotherms. The Freundlich isotherm model (R2 = 0.98–0.99) fitted the equilibrium data better than the Langmuir and D–R isotherm models, with low sum of error values (SE = 1.4–9.2%). The mean adsorption free energy derived from the D–R isotherm model (R2 = 0.95–0.99) showed that the adsorption of drin pesticides was taken place by weak physical forces, such as van der Waals forces and hydrogen bonding. The calculated thermodynamic parameters, ΔH, ΔS and ΔG prove that drin pesticides adsorption on ATOS was feasible, spontaneous and exothermic under examined conditions. The pseudo first order, pseudo second order kinetic and the intra-particle diffusion models were used to describe the kinetic data and rate constants were evaluated. 相似文献
17.
Hyuck Hee Lee Young Soo Gyoung Kyung-Eun Lee Soon W. Lee 《Inorganica chimica acta》2011,378(1):174-185
Bis(azido)bis(phosphine)-Pd(II) and -Pt(II) complexes, [M(N3)2L2] {L = PMe3, PEt3, PMe2Ph, dppe = 1,2-bis(diphenylphosphino)ethane}, underwent 1,3-dipolar cycloaddition with organic chiral isothiocyanates (R∗-NCS: R∗ = (S)-(+)-1-phenylethyl, (R)-(−)-1-phenylethyl, (±)-1-phenylethyl, (S)-(+)-1-indanyl) to give the corresponding tetrazole-thiolato Pd(II) and Pt(II) complexes, trans-[M{S[CN4(R∗)]}2L2] or [M{S[CN4(R∗)]}2(dppe)]. Spectroscopic (IR and NMR) and X-ray structural analyses of the products showed that the absolute configuration of the starting organic isothiocyanates is retained throughout the reaction. Further treatments of the isolated tetrazole-thiolato complexes with electrophiles such as HCl or benzoyl chloride produced heterocyclic compounds containing a tetrazole thione or a tetrazolyl sulfide group. In addition, organic tetrazole thiones, [S = {CN4H(R∗)}] containing a chiral moiety, were prepared from NaN3 and R∗-NCS in the presence of water. 相似文献
18.
Yi-Shan Song 《Inorganica chimica acta》2005,358(1):191-195
A novel chain-like luminescent samarium coordination polymer {Sm3(C8H4O4)4(C12N2H8)2(NO3)}n (C8H4O4 = phthalate, C12N2H8 = 1,10-phenanthroline) has been assembled by hydrothermal process. The title complex crystallizes in the monoclinic system, space group P2(1)/c, with lattice parameters a = 22.56(3) Å, b = 11.155(15) Å, c = 20.32(3) Å, β = 96.70(2)°, V = 5078(12) Å3, F(000) = 2964, GOF = 0.857, R1 = 0.0358, wR2 = 0.0597, Z = 4. Samarium ions exhibit different coordination modes from each other and lead to the unexpected high asymmetrical structure. To our knowledge, it is the first example of lanthanide coordination polymers comprising the three asymmetrical central Sm3+ fragments. The photophysical properties have been studied with excitation and emission spectra. 相似文献
19.
André Tuchscherer Alexander Jakob Mohammed Al-Anber Tobias Rüffer Ramona Ecke Thomas Gessner 《Inorganica chimica acta》2011,365(1):10-11022
Consecutive synthesis methodologies for the preparation of a series of copper(I) formates [LmCuO2CH] (L = nBu3P: 4a, m = 1; 4b, m = 2; 5, L = [Ti](CCSiMe3)2, m = 1, [Ti] = (η5-C5H4SiMe3)2Ti) and [LmCuO2CH·HO2CR] (L = nBu3P: 7a, m = 1, R = H; 7b, m = 2, R = H; 7c, m = 2, R = Me; 7d, m = 2, R = CF3; 7e, m = 2, R = Ph. L = (cC6H11)3P, R = H: 8a, m = 2; 8b, m = 3. L = (CF3CH2O)3P, R = H: 9a, m = 2; 9b, m = 3. L = (CH3CH2O)3P, R = H: 10a, m = 2; 10b, m = 3. L = [Ti](CCSiMe3)2; m = 1: 11a, R = H; 11b, R = Ph) is reported using [CuO2CH] (1) and L (2a, L = nBu3P; 2b, L (cC6H11)3P; 2c, L = (CF3CH2O)3P; 2d, L = (CH3CH2O)3P; 3, L = [Ti](CCSiMe3)2) as key starting materials. Addition of formic acid (6a) or carboxylic acid HO2CR (6b, R = Me; 6c, R = CF3; 6d, R = Ph) to the afore itemized copper(I) formates 4 and 5 gave metal-organic or organometallic 7-11. The molecular structures of 8a and 11a in the solid state are reported showing a threefold coordinated copper(I) ion, setup by either two coordinatively-bonded phosphorus atoms and one formate oxygen atom (8a) or two π-bonded alkyne ligands and one oxygen atom (11a). A formic acid molecule is additionally hydrogen-bonded to the CuO2CH moiety. The use of 7b as suitable precursor for the deposition of copper onto TiN-coated oxidized silicon wafers by the spin-coating process below 300 °C is described. Complex 7b offers an appropriate transformation behavior into metal phase by an elimination-decarboxylation mechanism. The morphology of the copper films strongly depends on the annealing conditions. A closed grain network densified by a post-treatment is obtained (8 °C min−1, N2/H2 carrier gas). Hydrogen post-anneal to 420 °C after film deposition gave a copper film showing resistivities from 2.5 to 3.7 μΩ cm. This precursor was also used for gap-filling processes. 相似文献
20.
Sharma P Chauhan PS Dutt P Amina M Suri KA Gupta BD Suri OP Dhar KL Sharma D Gupta V Satti NK 《Steroids》2011,76(4):358-364
A new steroidal sapogenin molecule 1 having unique characteristics, 21-nor and unusual C19 carboxylic acid has been isolated from the roots of Asparagus racemosus. On the basis of chemical evidence, extensive spectroscopic analysis including two dimensional (2D) NMR and X-ray studies of single crystal, the structure of 1 was determined as (1S,2R,3S,8S,9S,10S,13S,14S,16S,17R,22R,25R)-21-nor-18β,27α-dimethyl-1β,2β,3β-trihydroxy-25-spirost-4-en-19β-oic acid. 1 crystallizes in monoclinic space group P21 with a = 9.295(2), b = 11.238(2), c = 11.376(2) Å; β = 91.993(4)°, Z = 2, Dcal = 1.344 Mg/m3. The structure was solved by direct methods and refined by full-matrix least-squares procedure to a final R-value of 0.0561 for 4064 observed reflections. 1 was tested against the type of immune responses generated during treatment in normal and immune-suppressed animals and detailed biological activity evaluation suggests it to be a potent immunostimulator. 相似文献