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1.
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
2.
Aurkie Ray Guillaume Pilet Carlos J. Gómez-García Sebastián Bellú 《Inorganica chimica acta》2011,375(1):20-30
A tridentate NNO donor Schiff base ligand [(1Z,3E)-3-((pyridin-2-yl)methylimino)-1-phenylbut-1-en-1-ol = LH] in presence of azide ions coordinates with cobalt(II) and copper(II) ions giving rise to three new coordination complexes [Co2(L)2(μ1,1-N3)2(N3)2] (1), [Cu2(L)2(μ1,3-N3)]·ClO4 (2) and [(μ1,1-N3)2Cu5(μ-OL)2(μ1,1-N3)4(μ1,1,1-N3)2]n (3). The complexes have been characterized by elemental analysis, FT-IR, UV-Vis spectral studies, and single crystal X-ray diffraction studies. These complexes demonstrate that under different synthetic conditions the azide ions and the Schiff base ligand (LH) show different coordination modes with cobalt(II) and copper(II) ions, giving rise to unusual dinuclear and polynuclear species (1, 2 and 3) whose structural variations are discussed. Magneto-structural correlation for the very rare singly μ1,3-N3 bridged CuII-Schiff base dinuclear species (2) has been studied. In addition, the catalytic properties of 1 for alkene oxidation and the general catalase-like activity behavior of 2 have been discussed. 相似文献
3.
Three Cu(II)-azido complexes of formula [Cu2L2(N3)2] (1), [Cu2L2(N3)2]·H2O (2) and [CuL(N3)]n (3) have been synthesized using the same tridentate Schiff base ligand HL (2-[(3-methylaminopropylimino)-methyl]-phenol), the condensation product of N-methyl-1,3-propanediamine and salicyldehyde). Compounds 1 and 2 are basal-apical μ-1,1 double azido bridged dimers. The dimeric structure of 1 is centrosymmetric but that of 2 is non-centrommetric. Compound 3 is a μ-1,1 single azido bridged 1D chain. The three complexes interconvert in solution and can be obtained in pure form by carefully controlling the synthetic conditions. Compound 2 undergoes an irreversible transformation to 1 upon dehydration in the solid state. The magnetic properties of compounds 1 and 2 show the presence of weak antiferromagnetic exchange interactions mediated by the double 1,1-N3 azido bridges (J = −2.59(4) and −0.10(1) cm−1, respectively). The single 1,1-N3 bridge in compound 3 mediates a negligible exchange interaction. 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.
Augustin M. Madalan Mirela Neculai Marc Schmidtmann Yves Journaux 《Inorganica chimica acta》2006,359(2):459-467
Three new homopolynuclear complexes with azido bridges have been obtained by using [Cu(AA)(BB)]+ building-blocks (AA = acetylacetonate; BB = 1,10-phenanthroline or 2,2′-bipyridine). The reaction between [Cu(acac)(phen)(H2O)](ClO4) and NaN3 leads to a mixture of two compounds: a binuclear complex, [{Cu(acac)(phen)}2(μ1,3-N3)](ClO4) · 2H2O (1), and a linear tetranuclear one, [{Cu(acac)(phen)(ClO4)}2{Cu(phen)(μ1,1-N3)2}2] (2). The reaction between [Cu(acac)(bipy)(H2O)](ClO4) and NaN3 affords also a mixture of two compounds: [{Cu(acac)(bipy)}2(μ1,3-N3)]3(ClO4)3 · 3.75H2O (3) and [Cu(acac)(bipy)(N3)][Cu(acac)(bipy)(H2O)](ClO4) (4). The X-ray crystal structures of compounds 1-4 have been solved (for compound 4 the crystal structure was previously reported). In compounds 1 and 3, two {Cu(AA)(BB)} fragments are bridged by the azido anion in an end-to-end fashion. Two isomers, cis and trans with respect to azido bridge, were found in crystal 3. The structure of compound 2 consists of two Cu(II) central cations bridged by two μ1,1-azido ligands, each of them being also connected to a {Cu(acac)(phen)} fragment through another μ1,1-azido ligand. The cryomagnetic properties of the compounds 1 and 2 have been investigated and discussed. The magnetic behaviour of compound 1 shows the absence of any interactions between the metallic ions. In the tetranuclear complex 2, the magnetic interactions between the external and central copper(II) ions(J1), and between the central metallic ions (J2) were found ferromagnetic (J1 = 0.36 cm−1, J2 = 7.20 cm−1). 相似文献
6.
《Inorganica chimica acta》2006,359(7):2271-2274
Two dinuclear nickel(II) complexes, [Ni2(L-Et)(N3)(H2O)3](NO3)2 · 2H2O (1) and [Ni2(L-Et)(μ-1,3-N3)(H2O)2](NO3)2 · 4H2O (2) containing (HL-Et = N,N,N′,N′-tetrakis[(1-ethyl-2-benzimidazolyl)methyl]-2-hydroxy-1,3-diaminopropane), have been synthesized and characterized by their IR and UV–Vis spectra and magnetic susceptibilities. The crystal structures of [Ni2(L-Et)(N3)(H2O)3](NO3)2 · CH3OH (1′) and [Ni2(L-Et)(μ-1,3-N3)(H2O)2](NO3)2 · 2C2H5OH (2′) similar to 1 and 2 were determined by X-ray crystallography. In 1′, the two nickel(II) ions are bridged by only an alkoxo group of L-Et−, while an azido and an alkoxo connect two nickel(II) ions in 2′. Magnetic susceptibility measurements (2–300 K) showed a weak ferromagnetic exchange coupling between the two nickel(II) ions (2J = 10.1 cm−1) for 1. On the other hand, antiferromagnetic interactions were observed for 2 (2J = −15.8 cm−1). 相似文献
7.
M. Salah El Fallah Ramon Vicente Albert Escuer Fatima Badyine Xavier Solans Mercè Font-Bardia 《Inorganica chimica acta》2008,361(14-15):4065-4069
The syntheses, structural characterization and magnetic behaviour of two new tetranuclear copper(II) compounds with formulae [Cu4(μ2-PhCOO)2(μ-bdmap)2(μ1,3-N3)2(N3)2(H2O)2] 1, and [Cu4(μ2-PhCOO)2(μ-bdmap)2(μ1,3-N3)2(PhCOO)2(CH3OH)2] 2, in which bdmap is 1,3-bis(dimethylamino)-2-propanolato are reported herein. The magnetic behaviour of the two complexes has been checked giving a bulk antiferromagnetic coupling in the two cases with J values of ?85.4 and ?89.5 cm?1 for 1 and 2, respectively. 相似文献
8.
Four polymeric complexes [M(SCN)2(4-abaH)2]n [M=Co(II) (1) or Cd(II) (2), 4-abaH=4-aminobenzoic acid], [Zn(N3)(4-aba)]n (3) and [Cd(N3)(4-aba)(H2O)]n (4) were prepared from the reactions of 4-abaH with M(SCN)2 [M=Co(II) or Cd(II)] and M(N3)2 [M=Zn(II) or Cd(II)] at different pH values. Their crystal structures have been determined by single-crystal X-ray diffraction. Both 1 and 2 consist of one-dimensional chains [M(μ-1,3-SCN)2(4-abaH)2]n, in which each pair of the lateral carboxylic groups form double hydrogen bonds to furnish infinite two-dimensional sheets. In 3, the Zn(II) atoms are bridged by μ-1,1-azide groups and μ2-carboxylate-O,O′ groups into an infinite zigzag chain featuring six-membered (ZnNZnOCO)n rings, which are further connected by the 4-aba-N,O,O′ groups to generate a two-dimensional network. In 4, however, adjacent Cd(II) atoms are bridged by μ-1,1,3-azide groups to form an infinite chain with both four-membered Cd2(μ-1,1-N3)2 and eight-membered Cd2(μ-1,3-N3)2 rings. These chains are further connected by the 4-aba-N,O groups to generate a three-dimensional brickwall-like network. The results show significant effect of pH on the formation of the network structures. 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.
Mercury(II) acetate reacts with the 1-alkyl-2-(arylazo)imidazoles [RaaiR′ where R = H (a), Me (b); R′ = Me (1/3/5), Et (2/4/6)] and sodium azide in methanol solution to afford azido bridged polymeric complexes [Hg(RaaiR′)(N3)2]n (3/4). On setting up similar reaction condition, the reaction of Hg(OAc)2 with RaaiR′ and NH4SCN has yielded, instead of polymer, an ion-pair [Hg(RaaiR′)4][Hg(SCN)4] (5/6). The complexes are characterised by elemental analysis, IR, UV-Vis, 1H NMR spectral data and single-crystal X-ray structures of [Hg(HaaiEt)(μ-1,1-N3)2]n (4a) and [Hg(HaaiEt)4][Hg(SCN)4] (6a). The complex 4a is a coordination polymer with end-on (μ-1,1) azido bridge and 6a has tetrahedral structure. 相似文献
11.
Ivan Nemec Radovan Herchel Ingrid Svoboda ?ubor Dlháň Hartmut Fuess 《Inorganica chimica acta》2011,366(1):366-11903
Syntheses and crystal structures of nickel(II) complexes containing teta (teta = N,N′-bis(2-aminoethyl)ethane-1,2-diamine) as a tetradentate blocking ligand and cyanidometallic bridging complexes are described. The complexes [Ni(teta)(cis-μ2-Ni(CN)4)] (1) and [{Ni(teta)}3(μ6-Co(CN)6)] (ClO4)3 (2) exhibit a 1D-polymeric structure whereas the heterometallic trinuclear complex [Ni(teta)(μ1-Ag(CN)2)2] (3) forms a unique network. The weak antiferromagnetic exchange was found in polymeric species 1 and 2 by analyzing the magnetic data with several models in which either only susceptibility was treated or simultaneous fitting of temperature and magnetic field dependences of the magnetization was applied using the finite-size closed ring approach. Moreover, an effect of the zero-field splitting phenomenon (ZFS) was considered for 2 by advanced modeling of magnetic properties for varying axial ZFS parameter/isotropic exchange (D/J) ratios. 相似文献
12.
Reaction of 4,4′-di(3-pyridyl-4-pyrimidinyl) disulfide (3-PPDS) with AgNO3 leads to a unique 2D extended structure {[Ag(3-PPDS)(NO3)]}n (1) based on [Ag2(3-PPDS)2] macrocycle units, of which 1D inorganic [Ag(NO3)]n helical chains are generated. By contrast, definite Ag-S bonding interactions associated with the disulfide function have been established in {[Ag(2-PPDS)]ClO4}n (2), which is assembled of 4,4′-di(2-pyridyl-4-pyrimidinyl) disulfide (2-PPDS) with AgClO4. Solid state luminescent properties of complexes 1 and 2 are also examined. 相似文献
13.
Assembly of N,N′-bis(4-picolinoyl)hydrazine (H2L) with cadmium nitrate in the presence of dicyanamide anion (dca) affords a new coordination polymer {[Cd(HL)(dca)] · (H2O)0.5}n (1), in which the [Cd(HL)]n layers are extended by dca bridges to result in a three-dimensional (3-D) coordination framework. The network structure of 1 has unusual (3,5)-connectivity and represents a new type of (4·62)(4·66·83) topology. Two such identical and complementary networks are entangled to generate a twofold parallel interpenetrating supramolecular lattice. 相似文献
14.
Bidentate ligands 2,2′-biquinoline (biq) and 6,6′-dimethyl-2,2′-bipyridine (dmbpy) with steric hindrance substituents cis to the nitrogen atoms have been used in the synthesis of transition metal complexes. Six new doubly end-on azido-bridged binuclear complexes [M2(biq)2(μ1,1-N3)2(N3)2] (M = Ni (1), M = Co (2)), [M2(biq)2(μ1,1-N3)2Cl2] (M = Ni (3), M = Co (4)), [M2(dmbpy)2(μ1,1-N3)2(N3)2] (M = Ni (5), M = Co (6)) and one end-to-end thiocyanato-bridged polymeric [Ni(dmbpy)(μ1,3-SCN)(NCS)]n (7) have been synthesized and characterized by single crystal X-ray diffraction analysis and magnetic studies. Complexes 1-6 comprise five-coordinate M(II) ions bridged by two end-on azide ligands. The bridging M-N-M bond angles are in the small range 104.1-105.2°. Complex 7 consists of a singly thiocyanate-bridged Ni(II) chain in which Ni(II) ions are five-coordinate. This research suggests that the bulky ligands play a key role in the formation of five-coordinate coordination structure. All complexes display intramolecular intermetallic ferromagnetic coupling with JNiNi and JCoCo of ca. 23 or 13 cm−1 based on the Hamiltonian (S1 = S2 = 1 for Ni2, or 3/2 for Co2). The singly SCN−-bridged chainlike complex 7 shows intrachain ferromagnetic interaction with J = 3.96(2) cm−1 and D = −4.55(8) cm−1 (. Magneto-structural correlationship has been investigated. 相似文献
15.
Marta Estrader Carmen Diaz Joan Ribas Xavier Solans Merce Font-Bardía 《Inorganica chimica acta》2008,361(14-15):3963-3969
The synthesis, crystallographic analysis and magnetic studies of six new copper(II) complexes of formulae [Cu(μ-ala)(im)(H2O)]n(ClO4)n (1), [Cu(μ-ala)(pz)(μ-ClO4)] (2), [Cu(μ-phe)(im)(H2O)]n(ClO4)n (3), [Cu(μ-gly)(H2O)(ClO4)]n (4), [Cu(μ-gly)(pz)(ClO4)]n(5) and [Cu(μ-pro)(pz)(ClO4)]n (6) have been carried out (ala = alanine; phe = phenylalanine; gly = glycine; pro = proline; im = imidazole; pz = pyrazole). In all cases, the deprotonated aminoacid ligand acts as chelate through the N(amine) and one O(carboxylato), whereas the second O atom of the same carboxylato acts as a bridge to the neighbouring copper(II) ion. The coordination of copper(II) ions is square-pyramidal in all complexes but 2 (elongated Oh). All complexes (1–6) are uniform chains with syn–anti (equatorial–equatorial) coordination mode of the carboxylato bridging ligand, exhibiting intrachain ferromagnetic interactions. 相似文献
16.
A cyclopentadiene compound having methyl substituents on 1,3-positions, 1,3-Me2-2-CH2(OTHP)-C5H3 (3) is prepared from 2-bromo-3-methyl-2-cyclopenten-1-one ethylene ketal (1) in 48% overall yield. Addition of 2.5 equivalents of indenyllithium to 3 affords a methylene bridged 1,3-dimethylcyclopentadienyl indenyl compound, CH2(1,3-Me2C5H3)(C9H7) (5) in 72% yield. Reaction of dilithium salt of 5 with ZrCl2(NMe2)2 (DME) furnishes an ansa-zirconocene complex [CH2(1,3-Me2C5H2)(C9H6)]Zr(NMe2)2 (6), which is transformed cleanly to the dichloride complex, [CH2(1,3-Me2C5H2)(C9H6)]ZrCl2 (7), by treatment of Me3SiCl. Hydrogenation of 7 over PtO2 gives a tetrahydroindenyl complex [CH2(1,3-Me2C5H2)(C9H10)]ZrCl2 (8). Reaction of the dilithium salt of 5 with Ti(NMe2)2Cl2 does not provide the desired ansa-titanocene complex, but a dinuclear complex [(1,3-Me2C5H2)Ti(NMe2)2Cl]-CH2-[(C9H6)Ti(NMe2)Cl] (9) is obtained. The solid structures of 6 and 9 were determined by X-ray crystallography. The ethylene and ethylene/norbornene (co)polymerizations were studied with 7/MAO and 8/MAO. 相似文献
17.
2-(2′-Hydroxyphenyl) imidazoline ring grafted dinucleating diimine-diamine-tris-phenol ligand (H3aeas) has been obtained from a two-step reaction of 2-hydroxy acetophenone, N,N′-bis-(2-aminoethyl)ethylenediamine and 2-hydroxy benzaldehyde. Reaction of the ligand with Co(ClO4)2·6H2O and NEt3 in MeOH-DCM solvent mixture yielded the monometallic complex [Co(aea)]ClO4·H2O (1) of imidazolidine ring hydrolyzed hexadentate proligand H2aea. Any solvent derived MeO− bridged Co2 complex could not be obtained due to facile cobalt coordination assisted hydrolytic cleavage of substituted imidazolidine ring. When the reaction is carried out with Co(NO3)2·4H2O and CoCl2·6H2O in presence of NH4NCS and NaN3 in MeOH-DCM and MeOH under aerobic conditions, preassembly of bimetallic [Co2(μ-OMe)]5+ and [Co2(μ-N3)]5+ cores takes place on the solvent derived methoxido and azido clips through non-hydrolytic pathways in [(SCN)2Co2(μ-OMe)(μ-aeas)]·DMF (2), and cocrystals of [(N3)2Co2(μ-OMe)(μ-aeas)] (3a) and [(N3)2Co2(μ-N3)(μ-aeas)] (3b), respectively. 相似文献
18.
Two new polynuclear complexes of Cu(II), [(μ-1,1,3-N3)2{Cu2(me2tn)2(N3)2}]n (1) (me2tn=2,2-dimethylpropane-1,3-diamine) and [Cu2(μ-C2O4)(μ-N3)(ipr2en)2]n(ClO4)n (2) (ipr2en=N,N′-di-isopropylethane-1,2-diamine) have been synthesized and structurally characterized by X-ray crystallography. The crystal structure of 1 displays a 2D network in which distorted octahedral copper(II) centers, chelated by a me2tn ligand and bound to a terminal azide, are connected through μ-1,1,3 bridging azide anions. The structure of 2 shows 1D chains comprising alternating [(ipr2en)Cu-Ox-Cu(ipr2en)] units and end-to-end azide ligand. The chains on mutual H-bonding interaction through ClO4−, give rise to a 2D supramolecular architecture. The magnetic data of complexes were recorded in the temperature range, 300-2 K. In case of complex 1, the magnetic data are consistent with a ferromagnetic interaction through the end-on azide bridge (JFM=10 cm−1) and a weak antiferromagnetic interaction (zj=−0.8 cm−1) between the ferromagnetically coupled dimers and an average g-value of 2.05. The susceptibility data of 2 were fitted using an alternating AF-AF chain spin 1/2 law which leads to the following parameters Joxalate=−180 cm−1, Jazide=−43 cm−1 and g=2.25 cm−1. 相似文献
19.
Three new mercury(II) coordination polymers, [Hg2(μ-bpa)(μ-SCN)2(μ-CH3COO)2]n (1), [Hg2(μ-4-bpdb)1.5(μ-CH3COO)(μ1,1- SCN)(μ1,3-SCN)(SCN)]n · CH3CN (2) and [Hg(μ-3-bpdb)(CH3COO)2]n (3) {(bpa = 1,2-bis(4-pyridyl)ethane, 4-bpdb) = 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene and 3-bpdb = 1,4-bis(3-pyridyl)-2,3-diaza-1,3-butadiene, have been synthesized and characterized by CHN elemental analysis and IR spectroscopy. The single crystal X-ray data show the compound 1 is two-dimensional coordination polymer as a result of simultaneously bridging 1,2-bis(4-pyridyl)ethane, acetate and thiocyanate ligands. The single-crystal X-ray data of the compound 2 show that the complex to be a two-dimensional polymer, one of Hg atoms has four-coordinate and one of them has seven-coordinate. Three SCN− anions show three different coordination modes with terminal, μ1,1-bridge and μ1,3-bridge fashions. The structural studies of compound 3 show the structure may be considered a one-dimensional coordination polymer of mercury(II) consisting of linear chains formed by a bridging 3-bpdb ligand. The thermal stabilities of these compounds were studied by thermal gravimetric (TG) and differential thermal analyses (DTA). 相似文献
20.
Pedro I. da S. Maia André G. de A. Fernandes Adriano D. Andricopulo Ernesto S. Lang Victor M. Deflon 《Journal of inorganic biochemistry》2010,104(12):1276-1282
New neutral Pd(II) and Pt(II) complexes of the type [M(L)(PPh3)] (M═Pd or Pt) were prepared in crystalline form in high-yield synthesis with the S-benzyldithiocarbazates and S-4-nitrobenzyldithiocarbazates derivatives from 2-hydroxyacetophenone, H2L1a and H2L1b, and benzoylacetone, H2L2a and H2L2b. The new complexes [Pt(L1a)(PPh3)] (1), [Pd(L1a)(PPh3)] (2), [Pt(L1b)(PPh3)] (3), [Pd(L1b)(PPh3)] (4), [Pt(L2a)(PPh3)] (5), [Pd(L2a)(PPh3)] (6), [Pt(L2b)(PPh3)] (7) and [Pd(L2b)(PPh3)] (8) were characterized on the basis of elemental analysis, conductivity measurements, UV-visible, IR, electrospray ionization mass spectrometry (ESI-MS), NMR (1H and 31P) and by X-ray diffraction studies. The studies showed that differently from what was observed for the H2L1a and H2L1b ligands, H2L2a and H2L2b assume cyclic forms as 5-hydroxypyrazolinic. Upon coordination, H2L2a and H2L2b suffer ring-opening reaction, coordinating in the same manner as H2L1a and H2L1b, deprotonated and in O,N,S-tridentate mode to the (MPPh3)2+ moiety. All complexes show a quite similar planar fourfold environment around the M(II) center. Furthermore, these complexes exhibited biological activity on extra and intracellular forms of Trypanosoma cruzi in a time- and concentration-dependent manner with IC50 values ranging from 7.8 to 18.7 μM, while the ligand H2L2a presented a trypanocidal activity on trypomastigote form better than the standard drug benznidazole. 相似文献