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1.
《Journal of Coordination Chemistry》2012,65(19):3348-3355
A new Zn(II) 2-chlorobenzoate complex, [Zn(2-ClC6H4COO)2(nad)2] (nad = nicotinamide), was synthesized and characterized by elemental analysis, infrared (IR) spectroscopy, mass spectrometry, thermal analysis, and X-ray structure determination. The mechanism of thermal decomposition of the complex was studied by TG/DTG, DTA, IR spectroscopy, and mass spectrometry. The thermal decomposition is characterized as a two-step process. Zinc oxide was found as the final product of the thermal decomposition performed up to 900°C. Mass spectrometry was used to determine the volatiles released during thermal decomposition. The IR spectrum indicates that carboxylate is coordinated to zinc in monodentate coordination. [Zn(2-ClC6H4COO)2(nad)2] crystallizes in the monoclinic system, space group Pn, a = 10.376(2) Å, b = 10.100(1) Å, c = 12.604(1) Å, β = 100.79(1)°. The zinc is tetrahedrally coordinated by two nitrogens of nicotinamide and two oxygens of 2-chlorobenzoate. 相似文献
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B. T. Tu H. L. Zhu G. He Y. Chen B. Hu J. Z. Chen 《Russian Journal of Coordination Chemistry》2011,37(9):696
A new monomolecular copper(II) complex, [Cu(Phen)2(Pda)] · 9H2O (I) (H2Pda = pyridine-2,4-dicarboxylate acid, Phen = 1,10-phenanthroline), has been prepared from H2Pda and Phen at room temperature and characterized by IR, elemental analysis, X-ray powder diffraction, and single-crystal X-ray diffraction. Structure analysis shows that each Cu(II) is coordinated by two Phen ligands and one Pda ligand to complete a octahedron CuN5O chromophore. In addition, a unique water networks paralleling to (001) composed by the crystallization water through hydrogen bonds play a important role in the stability of crystal structure. The crystal structure is found to be orthorombic with space group Pbcn and cell parameters a = 13.651(4), b = 22.516(7), c = 22.386(7) Å, R 1 = 0.0735 and wR 2 = 0. 0.1935. 相似文献
4.
Feng G Mareque-Rivas JC Williams NH 《Chemical communications (Cambridge, England)》2006,(17):1845-1847
Introducing ligand based hydrogen bond donors to increase the activity of a mononuclear Zn(II) complex for catalysing phosphate ester cleavage can be a more effective strategy than making the dinuclear analogue. 相似文献
5.
《Journal of Molecular Structure》2001,560(1-3):1-7
Four novel mixed ligand complexes of Cu(II), Co(II), Ni(II) and Zn(II) with saccharin and nicotinamide were synthesised and characterised on the basis of elemental analysis, FT-IR spectroscopic study, UV–Vis spectrometric and magnetic susceptibility data. The structure of the Cu (II) complex is completely different from those of the Co(II), Ni(II) and Zn(II) complexes. From the frequencies of the saccharinato CO and SO2 modes, it has been proven that the saccharinato ligands in the structure of the Cu complex are coordinated to the metal ion ([Cu(NA)2(Sac)2(H2O)], where NA — nicotinamide, Sac — saccharinato ligand or ion), whilst in the Co(II), Ni(II) and Zn(II) complexes are uncoordinated and exist as ions ([M(NA)2(H2O)4](Sac)2). 相似文献
6.
Feng G Mareque-Rivas JC Torres Martín de Rosales R Williams NH 《Journal of the American Chemical Society》2005,127(39):13470-13471
The activity of a Zn(II) complex of a tetradentate, tripodal ligand for catalyzing phosphodiester cleavage is enhanced 750-fold by introducing three hydrogen bond donors to the ligand. Inhibition studies show that the Zn-aqua complex is the kinetically active form and that it binds the transition state with a formal dissociation constant of 3 x 108 M-1. The effect of these ligand modifications on the transition-state affinity is comparable to the rate acceleration provided by the metal ion itself. Overall, this mononuclear complex is more active than the most reactive dinuclear Zn(II) complexes reported to date. 相似文献
7.
Udai P. Singh Preeti Babbar Pooja Tyagi Thomas Weyhermüller 《Transition Metal Chemistry》2008,33(8):931-940
A novel Co(II) hydroxo complex Co{HB(3-tBu-5-iPrpz)3}(OH) 4 {where HB(3-tBu-5-iPrpz)3 = hydrotris(3-tert-butyl-5-isopropylpyrazol-l-yl)borate} has been prepared and its molecular structure has been determined by X-ray crystallography.
This complex is mononuclear with distorted tetrahedral geometry. The reaction of CO2 with Co{HB(3-tBu-5-iPrpz)3}(OH) resulted in the formation of a μ-carbonato bridged binuclear complex [Co{HB(3-tBu-5-iPrpz)3}]2(CO3) wherein the carbonate group is bound to both metal centers in an asymmetrical manner. In order to explore the role of labile
metal complexes in promoting ester hydrolysis, complexes [Co{HB(3,5-iPr2pz)3}]2(OH)2 and Co{HB(3-tBu-5-iPrpz)3}(OH) have been used as catalysts in the hydrolysis of both carboxylate as well as phosphate esters. The product of 4-nitrophenylacetate
hydrolysis with Co{HB(3-tBu-5-iPrpz)3}(OH) was isolated as four coordinate Co{HB(3-tBu-5-iPrpz)3}(OC6H4-4-NO2) 6, whereas the reaction of 4-nitrophenyltrifluoroacetate with [Co{HB(3,5-iPr2pz)3}]2(OH)2 resulted the formation of the six coordinate Co{HB(3,5-iPr2pz)3}(OC6H4-4-NO2)(MeCN)2 species.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.
相似文献
Udai P. SinghEmail: |
8.
A. S. Antsyshkina T. V. Koksharova G. G. Sadikov I. S. Gritsenko V. S. Sergienko O. A. Egorova 《Russian Journal of Inorganic Chemistry》2006,51(6):901-907
A coordination compound of copper(II) valerate with nicotinamide, [CuL(C4H9COO)2]2 (I), has been synthesized, and its crystal structure has been determined by X-ray crystallography. The crystals of I are triclinic: a = 9.1245(9) Å, b = 9.8572(6) Å, c = 11.0944(9) Å, α = 73.51(1)°, β = 79.917(6)°, γ = 72.161(7)°, Z = 2, space group $P\bar 1$ . In the centrosymmetric binuclear molecule of I, the copper atoms (Cu...Cu′, 2.621 Å) are linked through four bidentate chelating valerate ligands (av., Cu-O 1.969 Å). The coordination polyhedron of the Cu atom is a tetragonal pyramid with the nitrogen atom of the pyridine ring in the apical position at a longer distance (Cu-N, 2.190 Å). 相似文献
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You-Wei Yao Hao-Xiang Lin Xiao-Dan Sun Hui-Zhong Kou Qiang Cai Heng-De Li Ran-Bo Yu Dan Wang 《Transition Metal Chemistry》2005,30(3):294-298
A novel polymeric complex, [Mn(phen)(pdc)]∞ (phen=1,10-phenanthroline, H2pdc=2,5-pyridinedicarboxylic acid) has been synthesized from the hydrothermal reaction system of H2pdc, phen, MnO2, and H2O. [Mn(phen)(pdc)]∞ is characteristic of an edge-sharing dinuclear MnII structure unit bridged by pdc, leading to a 2-D framework whose stacking is based on weak H-bond interaction. The temperature dependence of the magnetic susceptibility for [Mn(phen)(pdc)]∞ indicates antiferromagnetic coupling [J = −2.76(4) cm−1] between the adjacent paramagnetic MnII ions. 相似文献
11.
A. Bujacz M. Turek W. Majzner E. Lodyga-Chruscinska 《Russian Journal of Coordination Chemistry》2010,36(6):430-435
A new crystal structure of the dichloro(L-histidine)copper(II) half-hydrate is reported. In this complex, histidine acts as
a bidentate ligand to the copper(II) cation. The coordination sphere of the copper cation is created by the carboxyl oxygen
and the amine nitrogen from main chain group of histidine. Two additional chloride anions complete the square coordination
of the central Cu+2 cation. In the crystal, the copper cations are additionally surrounded by two chloride anions from neighboring complex molecules,
which are located in the distant axial position and fill up the stretched octahedral coordination sphere Cu+2. In the presented complex, the histidine molecule exists as a zwitter ion with an unprotonated negatively charged carboxyl
group and with double protonated positively charged imidazole ring. Crystallographic study was supported by IR measurements
confirming the presence of water in the crystal structure. 相似文献
12.
Reaction of 3,5-(CF(3))(2)PzLi with anhydrous RhCl(3) in THF gives [Li(THF)](2)Rh(μ-3,5-(CF(3))(2)Pz)(4) (1) as a rare example of a mononuclear, paramagnetic Rh(II) complex (Pz = pyrazolate). 相似文献
13.
E. -J. Gao T. -L. Liu W. Jiao L. -L. Jiang D. Zhang Y. -J. Zhang J. Xu G. -L. Wu 《Journal of Structural Chemistry》2013,54(5):972-977
A novel Zn(II) coordination polymer [Zn2(phen)2]L4·3H2O(1) is synthesized by the reaction of Zn(NO3)2, Phen(1,10-phenanthroline), and L(2-mercaptonicotinic acid) at room temperature and structurally characterized by X-ray single crystal diffraction along with IR spectra and elemental analysis. Title complex 1 belongs to the triclinic system with the space group (P-1), a = 10.9373(11) Å, b = 11.6201(12) Å, c = 13.1371(14) Å; α = 116.100(1)°, β = 97.717(2)°, γ = 108.652(2)°, V = 1344.4(2) Å3; Z = 2, ρcalc = 1.596 g·cm?3, F(000) = 664, R 1 = 0.0708 and wR 2 = 0.1823 independent reflections for 18523 observed ones (I > 2σ(I)), and the zinc atom is rendered five-coordinated in a distorted tetragonal pyramid coordination geometry by two nitrogen atoms from the phen molecule, two oxygen atoms from two L molecules, and an oxygen atom from the H2O molecule. Complex 1 forms a 1D chain by O-H…O hydrogen bonds from free-water, while the 2D layer structure is formed by C-H…O hydrogen bonds through the L ligand of adjacent chains. These compounds further result in a 3D network structure by the intermolecular π…π stacking interaction of the neighbouring layers. 相似文献
14.
Bontchev Panayot R. Mehandjiev Dimitar R. Ivanova Bojidarka B. Bontchev Ranko P. 《Transition Metal Chemistry》2003,28(7):745-748
The complexation processes between the calcium channel antagonist drug nifedipine (Nif) and CuII lead to the formation of a mononuclear violet complex CuNif2Cl2
(1). Monocrystals of (1) were isolated and their structure determined by X-ray diffraction. Copper is coordinated through N of the NH group of the ligand. The metal ion is coordinated also with two Cl– anions and the geometry of the CuN2Cl2 core is a near flat square. The magnetic and optical properties of (1) were also studied using electronic and i.r. spectra, e.p.r. and magnetochemical measurements. 相似文献
15.
Icbudak H. Heren Z. Kose D. Ali Necefoglu H. 《Journal of Thermal Analysis and Calorimetry》2004,76(3):837-851
The mixed-ligand p-hydroxybenzoate complexes of Ni(II), Cu(II) and Zn(II) with nicotinamide and N,N-diethylnicotinamide were synthesized and
characterized by elemental analysis, magnetic susceptibility measurements and mass spectrometry. The thermal behavior of the
complexes was studied by simultaneous TG, DTG and DTA methods in static air atmosphere. The infrared spectral characteristics
of the complexes are also discussed. The complexes contain two water molecules, two p-hydroxybenzoato (p-hba) and two nicotinamide (na) (or diethylnicotinamide (dena)) ligands per formula unit. In these complexes,
all ligands are coordinated to the metal ion as monodendate ligands. In Zn(II)-na and Cu(II)-dena complexes, thep-hydroxybenzoate behaves as bidentate chelating ligand through carboxylic oxygen atoms. The decomposition pathways and the
stability of the complexes are interpreted in the terms of the structural data. The final decomposition products were found
to be the respective metal oxides.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
16.
Eremin A. V. Gerasimova L. S. Belyaev A. N. 《Russian Journal of General Chemistry》2011,81(7):1558-1559
Russian Journal of General Chemistry - 相似文献
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Li SA Li DF Yang DX Li YZ Huang J Yu KB Tang WX 《Chemical communications (Cambridge, England)》2003,(7):880-881
[(CuimZnL-2H)(CuimZnL-H)](ClO4)3, the first imidazolate-bridged Cu(II)-Zn(II) complex of a unique single macrocyclic ligand with two flexible hydroxyethyl pendants, L (L = 3,6,9,16,19,22-hexaaza-6,19-bis(2-hydroxyethyl)tricyclo[22.2.2.2(11,14)]triaconta-1,11,13,24,27,29-hexaene) has been obtained, in which the macrocyclic ligand with two hydroxyethyl arms possesses a markedly different conformation compared to its dicopper analogue. 相似文献
19.
《Journal of Coordination Chemistry》2012,65(11):2032-2038
A Zn(II) complex with an organoselenium substituted Schiff base, bis{2-[(benzylimino)methyl]-4,6-dihydroselenophenol}Zn(II), has been synthesized and characterized by elemental analyses and X-ray diffraction. Zn(II) is four-coordinated by two phenolate O and two imine N from two organoselenium substituted Schiff-base ligands, forming a distorted tetrahedral geometry. The title complex and its ligand were tested in vitro for their antibacterial and antitumor activity with the complex showing higher antibacterial and antitumor activities. 相似文献
20.
The cobalt, nickel, copper and zinc atoms in bis(1,10-phenanthroline)bis(salicylato-O)metal(II) monomeric octahedral complexes
[M(Hsal)2(phen)2]·nH2O, (M: Co(II), n=1; Cu(II), n=1.5 and Ni(II), Zn(II), n=2) are coordinated by the salicylato monoanion (Hsal) through the carboxyl oxygen in a monodentate fashion and by the 1,10-phenanthroline (phen) molecule through the two amine
nitrogen atoms in a bidentate chelating manner. On the basis of the DTGmax, the thermal stability of the hydrated complexes follows order: Ni(II) (149°C)>Co(II) (134°C)>Zn(II) (132°C)>Cu(II) (68°C)
in static air atmosphere. In the second stage, the pyrolysis of the anhydrous complexes takes place. The third stage of decomposition
is associated with a strong exothermic oxidation process (DTA curves: 410, 453, 500 and 450°C for the Co(II), Ni(II), Cu(II)
and Zn(II) complexes, respectively). The final decomposition products, namely CoO, NiO, CuO and ZnO, were identified by IR
spectroscopy.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献