共查询到20条相似文献,搜索用时 15 毫秒
1.
Renata Galvão de Lima Daniella Bonaventura Renata Fonseca Vianna Lopez Roberto Santana da Silva 《Inorganica chimica acta》2005,358(9):2643-2650
Preliminary pharmacological studies of various nitric oxide (NO) photo-releasing agents are reported based on the flash-photolysis studies of the nitro ruthenium complexes cis-[RuII(NO2)L(bpy)2]+ (bpy = 2,2′-bipyridine and L = pyridine, 4-picoline and pyrazine) and [RuII(NO2)(bpy)(terpy)]+ (terpy = terpyridine) in physiological medium. The net photoreactions under these conditions are two primary photoproducts, in (I) there is RuII-NO2 photoaquation, where the photoproducts are RuII-H2O plus and (II) homolytic dissociation of NO from a coordinated nitrito to derive the RuII-OH2 specie and NO. Based on photochemical processes, the nitro ruthenium complexes were incorporated in water in oil (W/O) microemulsion and used in the vasorelaxation induced experiment. Denuded rat aortas were contracted with KCl and nitro ruthenium complexes in microemulsion were added. Perfusion pressures were recorded while arteries were irradiated at 355 nm The time to reach maximum relaxation was longer for [RuII(NO2)(bpy)(terpy)]+ complex (ca. 50 min, n = 6) than for cis-[Ru(NO2)L(bpy)2]+ with L = py and 4-pic complex (ca. 28 min, n = 6) and cis-[Ru(NO2)(bpy)2 (pz)]2+ complex (ca. 24 min, n = 5). 相似文献
2.
Six lanthanide two-dimensional network coordination polymers with the general formula of [Ln(pmida)(NO3)(H2O)]n, where Ln = La (1), Nd (2), Sm (3), Gd (4), Dy (5), Er (6) and pmida2− = N-(2-pyridylmethyl)iminodiacetate, have been synthesized by hydrothermal process and characterized by elemental analysis, Infrared spectroscopy, thermogravimetric analysis and single-crystal X-ray diffraction. All crystals are isostructural and crystallize in the monoclinic space group P21/a. The lanthanide(III) ion is nine-coordinated in a geometry of distorted tricapped trigonal prism by two N atoms and two O atoms from one pmida2− ligand, two bridging carboxylate O atoms from other two pmida2− ligands, two O atoms of a bidentate chelating nitrate and a O atom of a coordinated water molecule. The luminescent properties of [Sm(pmida)(NO3)(H2O)]n (3) and [Dy(pmida)(NO3)(H2O)]n (5) were investigated. 相似文献
3.
Gómez-Saiz P Gil-García R Maestro MA Pizarro JL Arriortua MI Lezama L Rojo T González-Alvarez M Borrás J García-Tojal J 《Journal of inorganic biochemistry》2008,102(10):1910-1920
New complexes of formulae [Cu(HL2)(H2O)(NO3)](NO3) (1), [{Cu(L1)(tfa)}2] (2), [{Cu(L1)}2(pz)](ClO4)2 (3) and {[{Cu(L1)}2(dca)](ClO4)}n (4), where HL1 = pyridine-2-carbaldehyde thiosemicarbazone, HL2 = pyridine-2-carbaldehyde 4N-methylthiosemicarbazone, Htfa = trifluoroacetic acid (CF3COOH), pz = pyrazine (C4H4N2) and dca = dicyanamide [N(CN)2]−, have been synthesized and characterized. The crystal structures of these compounds are built up of monomers (1), dinuclear entities with the metal centers bridged through the non-thiosemicarbazone coligand (2 and 3) and 1D chains of dimers (4). In all the cases, square-pyramidal copper(II) ions are present, except for the square-planar ones in 3. Magnetic measurements show antiferromagnetic couplings in 2, 3 and 4. The susceptibility data were fitted by the Bleaney-Bowers’ equation for copper(II) dimers derived from H = -2JS1S2 being the obtained J/k values −4.8, −4.3 and −5.1 K for compounds 2-4, respectively. The magnetic susceptibility of the already known [{Cu(HL1)(tfa)}2](tfa)2 compound has been also measured for the first time. The J/k value is -0.3 K, lower than that in 2. The nuclease activity of 3 and 4 has been analyzed. 相似文献
4.
Xiao-Ju Lin You Song Hai-Jun Xu Yi-Zhi Li Xiao-Zeng You 《Inorganica chimica acta》2005,358(6):1963-1969
An asymmetric single EO azido bridged dinuclear copper(II) complex, [Cu2(dmterpy)2(μ-1,1-N3)(N3)2] · NO3 · (H2O)21 [dmterpy = 5,5″-dimethyl-2,2′:6′,2″-terpyridine], and a double EO azido bridged dinuclear nickel(II) complex, [Ni2(pbdiim)4(μ-1,1-N3)2] · 2(N3) · 6(H2O) 2 [pbdiim = 2-(2′-pyridyl)benzo[1,2-d:4,5-d′]diimidazole], have been synthesized and characterized structurally and magnetically. Compound 1 consists of a single EO azido bridged CuII dimer in which each CuII ion is five-coordinated in the form of a distorted square-based pyramid. The N(μ−1,1) atom holds on the apical position of one CuII pyramid with an elongated bond length of 2.305 Å and on the basal plane of another distorted CuII pyramid with a bond length of 1.991 Å. The Cu-N(μ−1,1)-Cu angle is 117.4 (2)°. The copper(II) dimer forms a 1 D zig-zag chain via hydrogen bondings between azide ions, water molecules and the nitrate anion. Compound 2 consists of a double EO azido bridged NiII dimer with the Ni-N(μ−1,1)-Ni bond angle of 102.96 (13)°. The coordination geometry of NiII is octahedral. Their magnetic properties have been measured in the range from 300 to 2 K and correlated with the molecular structures. Compound 1 shows weak ferromagnetic interactions within the copper(II) dimer (J = 2.88 cm−1), despite the large EO azide bridge angle (117.4 (2)°). The intramolecular coupling between the NiII (S = 1) ions in compound 2 was found to be ferromagnetic (J = 27.87 cm−1). 相似文献
5.
Chatkaew Chailuecha Chaveng Pakawatchai Gerard A. van Albada 《Inorganica chimica acta》2006,359(13):4168-4178
Three new triply bridged dinuclear copper(II) compounds containing carboxylato bridges, [Cu2(μ-CH3COO-κ-O1,O2)2(μ-CH3COO-κ-O1)(dpyam)2](BF4) (1), [Cu2(μ-CH2CH3COO-κ-O1,O2)(μ-OH)(μ-OH2)(bpy)2](ClO4)2 (2) and [Cu2(μ-CH3COO-κ-O1,O2)(μ-OH)(μ-OH2)(phen)2](ClO4)2 (3) (in which dpyam = di-2-pyridylamine, bpy = 2,2-bipyridine, phen = phenanthroline), have been synthesized in order to investigate the magnetic super-exchange pathway between coupled copper(II) centres. All three compounds display a distorted square-pyramidal arrangement around each copper(II) ion with a CuN2O3 chromophore. Compound 1 has three acetato bridges, two of which connect each square pyramid at two equatorial sites in a triatomic bridging mode and the third acetato bridge acts at the apical site in the monoatomic bridging mode. The structures of compounds 2 and 3 are mutually similar. In each dinuclear unit, both copper(II) ions are linked at two equatorial positions through a hydroxo bridge and a triatomic carboxylato bridge and at the axial position through a water molecule.The magnetic susceptibility measurements, measured from 5 to 300 K, revealed an antiferromagnetic interaction between the Cu(II) ions in compound 1 and a ferromagnetic interaction for compounds 2 and 3 with singlet-triplet energy gaps (J) of −56, 149 and 120 cm−1, for compounds 1, 2 and 3, respectively. 相似文献
6.
Chandan Adhikary Jean-Pierre Tuchagues Sandra Ianelli Subratanath Koner 《Inorganica chimica acta》2009,362(15):5211-5218
Two mixed-ligand copper(II) complexes [{Cu(L1)(μ1,3-N3)}{Cu(L)(μ1,3-N3)(μ1,1-N3)}]n (1) [HL1 = 1-(N-ortho-hydroxyacetophenimino)-2,2-dimethyl-aminoethane; L = 2-(dimethylamino)-ethylamine] and [{Cu(L2)(μ1,3-N3)}{Cu(L)(μ1,3-N3)(μ1,1-N3)}]n (2) [HL2 = 1-(N-5-methoxy-ortho-hydroxyacetophenimino)-2,2-dimethyl-aminoethane] have been formed upon addition of aqueous solution of sodium azide to a methanolic solution of copper nitrate trihydrate and corresponding Schiff-base ligands. The ligands, HL1 and HL2 undergo partial hydrolysis of their imine bond during the course of reaction. Both the complexes contain single end-to-end (μ1,3) azido bridged 1D infinite chains (rail) which propagate parallel to the crystallographic b-axis; neighboring chains are interconnected by pairs through double asymmetric end-on (μ1,1) azido bridges (rung) to yield a ladder-like structure. In both complexes, rungs (end-on azido bridges) do not connect copper centers of the chains like in a regular ladder; instead they connect only the alternating copper sites of the 1D chain. In a chain the coordination environment around copper(II) ions are not the same: while the {Cu(L1)(μ1,3-N3)} and {Cu(L2)(μ1,3-N3)} moieties have a penta-coordinated copper(II) center, the copper(II) ion of the neighboring {Cu(L1)(μ1,3-N3)(μ1,1-N3)} or {Cu(L2)(μ1,3-N3)(μ1,1-N3)} moiety has an octahedral coordination environment. The variable temperature (2-300 K) magnetic susceptibility measurements showed that the magnetic interaction between the metal centers in complexes 1 and 2 is dominantly antiferromagnetic. The results of magnetic model are in good agreement with the experimental data. 相似文献
7.
Some zinc (II) complexes having formula [Zn(PziPr2H)(μ-PziPr2)(RCOO)]2 [(PziPr2H = 3,5-diisopropylpyrazole, RCOO− = carboxylate ligands with R is CH3 for 1, CF3 for 2, CH3(CH2)2 for 3, CH3(CH2)4 for 4 and CH3(CH2)5 for 5] were prepared and structurally characterized by different techniques including single crystal X-ray. The X-ray studies suggested that all these complexes are centrosymmetric dinuclear with tetrahedral geometry around each zinc center. The pyrazole ligand is coordinated in both terminal as well as a bridging fashion whereas the carboxylates behave as monodentate ligand. All the complexes show hydrogen bonding between hydrogen atom of pyrazole (N-H of terminal pyrazole) and nonbonded oxygen atom of carboxylate. Out of these complexes only 5 [Zn(PziPr2H)(μ-PziPr2)(CH3(CH2)5COO)]2 exhibited emission at room temperature. 相似文献
8.
Tobias Rüffer Björn Bräuer Bernhard Walfort Annie K. Powell Lorenzo Sorace 《Inorganica chimica acta》2007,360(12):3777-3784
The new mononuclear bis(oxamato) complex [n-Bu4N]2[Cu(obbo)] (1) (obbo=o-benzyl-bis(oxamato)) has been synthesized as a precursor for trinuclear oxamato-bridged transition metal complexes. Starting from 1 the homotrinuclear complexes [Cu3(obbo)(pmdta)2(NO3)](NO3)·CH2Cl2·H2O (2) and [Cu3(obbo)(tmeda)2(NO3)2(dmf)] (3) have been prepared, where pmdta = N,N,N′,N″,N″-pentamethyldiethylenetriamine, tmeda = N,N,N′,N′-tetramethylethylenediamine and dmf = dimethylformamide. The crystal structures of 1-3 were solved. The magnetic properties of 2 and 3 were studied by susceptibility measurements versus temperature. For the intramolecular J parameter values of −111 cm−1 (2) and −363 cm−1 (3) were obtained. 相似文献
9.
Two novel dinuclear nickel(II) complexes [Ni2(ntb)2(μ-tp)(H2O)1.61(CH3OH)0.39](NO3)2·5.13CH3OH·2.25H2O (1) and [Ni2(ntb)2(μ-fum)(H2O)(CH3OH)](NO3)2·6CH3OH·H2O (2) (tp = terephthalate dianion, fum = fumarate dianion, ntb = tris(2-benzimidazolylmethyl)amine) containing tetradentate poly-benzimidazole ligand were synthesized and structurally characterized by IR spectra, UV-Vis, elemental analysis and X-ray crystallography. The Ni(II) ions in 1 and 2 have distorted octahedral geometry with four nitrogen atoms of ntb, one oxygen atom of water and one oxygen atom supplied by the carboxylate group of the bridged dicarboxylato ligand. Complexes 1 and 2 consist of terephthalato- and fumarato-bridged dinickel(II) centers in bis(monodentate) bonding fashion. The Ni?Ni distances are 11.333 Å for 1 and 8.966 Å for 2. The magnetic susceptibility measurements at variable temperature show that two complexes exhibit weak antiferromagnetic interactions between nickel(II) ions with J values of −0.25 cm−1 and −0.36 cm−1, respectively. 相似文献
10.
In [PtX(PPh3)3]+ complexes (X = F, Cl, Br, I, AcO, NO3, NO2, H, Me) the mutual cis and trans influences of the PPh3 groups can be considered constants in the first place, therefore the one bond Pt-P coupling constants of P(cis) and P(trans) reflect the cis and trans influences of X. The compounds [PtBr(PPh3)3](BF4) (2), [PtI(PPh3)3](BF4) (3), [Pt(AcO)(PPh3)3](BF4) (4), [Pt(NO3)(PPh3)3](BF4) (5), and the two isomers [Pt(NO2-O)(PPh3)3](BF4) (6a) and [Pt(NO2-N)(PPh3)3](BF4) (6b) have been newly synthesised and the crystal structures of 2 and 4·CH2Cl2·0.25C3H6O have been determined. From the 1JPtP values of all compounds we have deduced the series: I > Br > Cl > NO3 > ONO > F > AcO > NO2 > H > Me (cis influence) and Me > H > NO2 > AcO > I > ONO > Br > Cl > F > NO3 (trans influence). These sequences are like those obtained for the (neutral) cis- and trans-[PtClX(PPh3)2] derivatives, showing that there is no dependence on the charge of the complexes. On the contrary, the weights of both influences, relative to those of X = Cl, were found to depend on the charge and nature of the complex. 相似文献
11.
The synthesis and spectroscopic characterization of the new symmetric, ligand bis(salicylaldehyde)methyliminodiacetylhydrazone (H4MeImds) is reported. The reactions of H4 MeImds with copper(II) chloride, nitrate and sulfate give trinuclear metal complexes of formula Cu3(MeImds)Cl2 · CHCl3 · H2O, Cu3(MeImds)(NO3)2 · 2H2O and Cu3(MeImds)(SO4) · 8H2O; the trinuclear species are obtained in spite of the used metal:ligand molar ratio. The X-ray crystal structure of [Cu3(MeImds)(SO4)(H2O)3] · 5H2O is determined; it consists of linear units, with the nonadentate ligand bound to three copper ions. The trimetallic units are bridged via sulfate anions to give hexanuclear dimers with an imposed centre of symmetry. The magnetic properties of [Cu3(MeImds)(SO4)(H2O)3] · 5H2O are characterized by a significant antiferromagnetic coupling within the trimetallic units and by a weak antiferromagnetic coupling between them. The analogous trinuclear copper(II) complexes Cu3(HImds)Cl2 · H2O and Cu3(HImds)(SO4) · 4H2O (H5Imds, bis(salicylaldehyde)iminodiacetylhydrazone) were also prepared and spectroscopically characterized. 相似文献
12.
The monoclinic structural isomers with molecular formula of [M(Pic)2(EO5)](Pic) where EO5 = pentaethylene glycol, Pic = picrate anion, and M = Gd, Tb, Er, Tm, Yb, and Y have been synthesized and characterized. The current study was conducted in the solid state to evaluate the coordination pattern of the central metal ion with the EO5 ligand in the presence of Pic anion. The photoluminescence (PL) spectra of the Tb and Yb complexes have the typical 4f-4f transition emissions of Tb(III) and Yb(III) ions. The Gd, Er, Tm, and Y complexes had broad bands resulting from the ligands. The counteranion factor influenced the emission intensity in the Tb-Pic-EO5 and Tb-NO3-EO5 complexes in several solvents also were studied. The Pic anion acts as a quencher in the [Tb(Pic)2(EO5)](Pic) complex due to the nitro withdrawing groups was clearly observed both in solution and the solid state. 相似文献
13.
Hybrid scorpionate/cyclopentadienyl titanium and zirconium complexes with alkoxide and imido ligands
Antonio Otero Juan Fernández-Baeza Antonio Antiñolo Agustín Lara-Sánchez Margarita Sánchez-Molina Manuel Urbano-Cuadrado 《Inorganica chimica acta》2009,362(8):2909-2789
The reactivity of hybrid scorpionate/cyclopentadienyl ligand-containing trichloride zirconium complexes [ZrCl3(bpzcp)] (1) [bpzcp = 2,2-bis(3,5-dimethylpyrazol-1-yl)-1,1-diphenylethylcyclopentadienyl] and [ZrCl3(bpztcp)] (2) [bpztcp = 2,2-bis(3,5-dimethylpyrazol-1-yl)-1-tert-butylethylcyclopentadienyl] toward several lithium alkoxides has been carried out. Thus, alkoxide-containing complexes [ZrCl2(OR)(bpzcp)] (R = Me, 3; Et, 4; iPr, 5; (R)-2-Bu, 6), [ZrCl2(OR)(bpztcp)] (R = Me, 7; Et, 8; iPr, 9; (R)-2-Bu, 10) and [Zr(OR)3(bpztcp)] (R = Et, 11; iPr, 12) were prepared by deprotonation of the appropriate alcohol group with BunLi followed by reaction with 1 or 2. In addition, the imido-complex [Ti(NtBu)Cl(bpztcp)(py)] (13) were also prepared. The structures of these complexes have been proposed on basis of spectroscopic and DFT methods. 相似文献
14.
By using the hindered tris(pyrazolyl)borate ligand TpiPr2 (hydrotris(3,5-diisopropyl-1-pyrazolyl))borate, both mono- and binuclear complexes of cobalt [TpiPr2Co](X) (X = NO3 and OBz) and [TpiPr2Co]2(μ-X)(μ-OBz) (X = OH, N3) were synthesized. The nitrato complex, [TpiPr2Co](NO3) (1), which could be converted to (2), was prepared by reaction of KTpiPr2 with hydrated Co(NO3)2 and its molecular structure was determined by X-ray crystallography. The dinuclear di(μ-hydroxo) complex, [TpiPr2Co]2(μ-OH)2 (2), which was obtained by treatment of 1 with aqueous NaOH, reacted with one equivalent of benzoic acid to give the (μ-benzoato)(μ-hydroxo) complex, [TpiPr2Co]2(μ-OH)(μ-OBz) (3). X-ray crystallography shows the presence of both hydroxy and carboxylate group as bridging ligands and both cobalt metals are in five coordination environment in 3. The μ-azido complex, [TpiPr2Co]2(μ-N3)(μ-OBz) (5), was prepared by reaction of 3 with one equivalent of aqueous sodium azide. The spectroscopic studies suggested μ-1,1-bridging nature of group in this complex. The reaction of 2 with excess amount of benzoic acid resulted in the destruction of the bimetallic core to give the mononuclear carboxylato complex, [TpiPr2 Co](OBz) (4), which was characterized by X-ray crystallography. 相似文献
15.
Jinkwon Kim Sujin Han Kwang-Yong Choi Hiroyuki Nojiri Byoung Jin Suh 《Inorganica chimica acta》2007,360(8):2647-2652
The octanuclear cyano-bridged cluster [(Tp)8Fe4Ni4(CN)12] · H2O · 24CH3CN (1) (Tp = hydrotris(1-pyrazolyl)borate) showing magnetic properties of single-molecule magnet has been synthesized by reaction of [fac-Fe(Tp)(CN)3]− with {(Tp)Ni(NO3)} species formed from an equimolar reaction mixture of Ni(NO3)2 · 6H2O and KTp in MeCN. The X-ray analysis of 1 shows molecular cube structure in which FeIII and NiII ions reside in alternate corners. The average intramolecular Fe?Ni distance is 5.124 Å. Out-of-phase ac susceptibility and reduce magnetization measurements show that 1 is a single molecule magnet with ground spin state S = 6 and spin reversal energy barrier U = 14 K. Magnetic hysteresis loops were also observed by applying fast sweeping field. 相似文献
16.
The new cluster Li[Fe3(μ3,η1-SCCFc)(CO)9] reacts with ClAuPPh3 to afford compound [Fe3Au(μ4,η2-CCFc)(CO)9(PPh3)], which exhibits an isomeric equilibrium in solution with the cluster [Fe3Au(μ3,η2-CCFc)(CO)9(PPh3)].The rupture of C-S bonds in the thioethers Me3SiCCSCCR (R = Fc, SiiPr3) in the presence of Fe3(CO)12, yields to the clusters [Fe3(μ-SCCSiiPr3)(μ-CCSiMe3)(CO)9] and [Fe3(μ,η2-(SiiPr3)CCCCSiMe3)(μ3-S)(CO)9] together with the unexpected compounds [Fe2(μ-SCC(H)R)(CO)6] (R = SiMe3, SiiPr3).Additionally, the dinuclear derivatives [Fe2(μ-SCCR)(μ-CCR′)(CO)6] (R = Fc, R′ = SiMe3; R = SiMe3, R′ = Fc; R = SiMe3; R′ = SiiPr3) have also been obtained. These compounds have been spectroscopically characterized and the crystal structure of some of them has been solved. 相似文献
17.
Dasarath Mal Chandan Adhikary Philipp Gütlich Ken-Ichi Okamoto 《Inorganica chimica acta》2008,361(1):183-187
Reaction of Ni(NO3)2 · 6H2O and sodium dicyanamide (Nadca) yields a 1D infinite chain complex {[Ni(dien)(μ1,5-dca)(H2O)](NO3)}n (1) (where dien = diethylenetriamine). The coordination environment in complex 1 around the nickel(II) ions is distorted octahedron. Three nitrogen atoms of the ligand diethylenetriamine and an oxygen atom of H2O molecule constitute the four coordination sites of the basal plane of the octahedron. Of two axial positions of the octahedron, one position is occupied by the nitrogen atom of a μ1,5-dca anion the remaining coordination site is occupied by a nitrogen atom of another end-to-end bridging dca from an adjacent [Ni(dien)(μ1,5-dca)(H2O)] moiety, yielding 1D infinite chains which propagate parallel to crystallographic a-axis. No measurable magnetic interaction was evidenced through variable temperature magnetic susceptibility measurements (4-300 K). However, the magnetic susceptibility of the compound can be explained in terms of single-ion anisotropic model with zero-field splitting for nickel(II) ions. 相似文献
18.
Two new molecular magnets, [BzPyN(CH3)2][Ni(mnt)2] (1) and [NO2BzPyN(CH3)2][Ni(mnt)2] (2)([BzPyN(CH3)2]+ = 1-benzyl-4-dimethylaminopyridinium, [NO2BzPyN(CH3)2]+ = 1-(4′-nitrobenzyl)-4-dimethylaminopyridinium, and mnt2− = maleonitriledithiolate) have been prepared and characterized by elemental analyses, IR, MS spectra, single crystal X-ray diffraction and magnetic susceptibility. The Ni(III) ions of both 1 and 2 form a 1D zigzag alternating magnetic chain within a column through Ni?S, Ni?Ni, Ni?N, S?S, or π?π interactions. Magnetic susceptibility measurements in the temperature range 1.8-300 K show that 1 exhibits antiferromagnetic behavior, while 2 shows a spin gap transition around 170 K, and antiferromagnetic interaction in the high-temperature phase (HT) and spin gap in the low-temperature phase (LT). The phase transition for 2 is second-order by determination of DSC analyses. 相似文献
19.
Sujittra Youngme Pongthipun Phuengphai Gerard A. van Albada Jan Reedijk 《Inorganica chimica acta》2005,358(11):3267-3271
The synthesis, X-ray structure, spectroscopic and magnetic properties of a zig-zag formato-bridged chain complex with the formula [Cu(dpyam)(μ-O2CH)(OH2)]n(NO3)n (1) (in which dpyam = di-2-pyridylamine) is described.The geometry of the copper(II) ion is distorted square pyramidal with a basal plane consisting of two nitrogen atoms of the dpyam ligand (Cu-N distances 1.987(3) and 2.010(3) Å) and two oxygen atoms of two different formato ligands (Cu-O distances 1.974(2) and 1.975(2) Å). A coordinated water molecule occupies the axial position at a distance of 2.222(3) Å. The copper atoms are bridged unsymmetrically by a formato anion in a syn-anti arrangement, resulting in a polymeric zig-zag chain structure.The magnetic susceptibility measurements (5-280 K) agree with a very weak ferromagnetic chain interaction between the Cu centres with a J value of 0.75 cm−1. 相似文献
20.
Two new neutral, binuclear CuIICuII bis(oxamato) complexes with the formula [Cu2(opba)(pmdta)(MeOH)] · 1/2MeOH · dmf (3) and [Cu2(nabo)(pmdta)(MeOH)] (4), with opba = o-phenylene-bis(oxamato), nabo = 2,3-naphthalene-bis(oxamato), pmdta = N,N,N′,N″,N″-pentamethyldiethylenetriamine and dmf = dimethylformamide have been synthesized and their crystal structures have been determined. The structure of 3 consists of dimeric [Cu2(opba)(pmdta)(MeOH)] entities, joined together by mutual intermolecular Cu?O contacts of the Cu2+ ion of one [Cu(opba)]2− complex fragment and one carboxylate atom of the oxamato group of a second [Cu(opba)]2− complex fragment. The structure of 4 consists of neutral binuclear complexes joined together by hydrogen bonds and π-π interactions, giving rise to an unique supramolecular 1D-chain. The magnetic properties of 3 and 4 were studied by susceptibility measurements versus temperature. For the intramolecular J parameter, identical values of (−114 ± 2) cm−1 (3) and (−112 ± 2) cm−1 (4) were obtained. 相似文献