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2.
A new μ 3-oxo trinuclear chromium(III) propionate cluster, [Cr 3(μ 3-O)(O 2CCH 2CH 3) 6(pyr) 3]NO 3·0.25(H 2O) ( 1), has been synthesized by reaction of a μ 3-oxo trinuclear chromium(III) propionate precursor [Cr 3(μ 3-O)(O 2CCH 2CH 3) 6(H 2O) 3]NO 3 with a pyrazol ligand (pyr) and characterized by IR spectroscopy, single-crystal X-ray structure determination, and thermal analysis. Magnetic susceptibility and magnetization studies revealed antiferromagnetic exchange interactions within the trinuclear Cr(III) cluster ( J = ?11.9 cm ?1) and determined the electronic ground state ( S = ½) of the compound. 相似文献
3.
CuLCl, CuL 1Cl, PdLCl 2, and PdL 1Cl 2 complexes [L and L 1 being (+)-camphor and (–)-carvone thiosemicarbazones, respectively] have been synthesized. The structure of binuclear [Pd 2L 22Cl 4] complex has been determined by means of X-ray diffraction. The L 2 ligand (dehydrogenated (–)-carvone thiosemicarbazone) is coordinated via the bridging S atom to two Pd atoms. The complexes of Cu(I) and Pd(II) presumably have polynuclear and binuclear structure, respectively. These facts are in good agreement with IR and NMR spectroscopy as well as mass spectrometry data which indicate the coordination of L and L 1 ligands via the S atom. The influence of L 1 and PdL 1Cl 2 on viability of the Hep2 cell line has been studied. The PdL 1Cl 2 complex is more cytotoxic than L 1 ligand. 相似文献
4.
Naphthalene diimides (NDIs) are promising candidate for electron acceptors due to their low-lying HOMOs and LUMOs. The functinalization of soluble NDIs at the 2,6-position affects the absorption and electrochemical properties. In this study, NDI-based hybrid dyes NDI-SQ-A, B fused with squaraine chromophore were designed and synthesized in order to elucidate the effects of the substitution on their optical and electrochemical properties. These dyes were successfully synthesized by Stille coupling reactions using 3-stannylcyclobutenediones and brominated NDI derivative, followed by a condensation reaction. DFT calculation predicts that the present dyes adopt distorted structures coming from a steric hindrance between semisquaraine and NDI moieties. The hybrid dyes show low-lying LUMOs due to the introduction of electron-deficient NDI moiety and broad absorption spectra in the far-red region. The absorption spectra of their thin films were bathochromically shifted relative to those in solution, indicating that hybrid dyes formed J aggregates. 相似文献
5.
From a reaction system including benzoic acid and Mn(NO3)2 in alkali medium, two hexanuclear manganese benzoate cluster compounds have been synthesized. A compound [Et4N]2[Mn6(PhCOO)14] has been structurally characterized, which contains hexanuclear Mn11 moieties extending unlimitedly to form one-dimensional linear structure. Carboxyl oxygen atoms are bridged in variety of modes to the Mn atoms, forming an arrangement like a sinusoid for the Mn atoms. The structural parameters of these compounds were compared with the data obtained from EXAFS determination for the Mn cluster in the OEC of PS11, supporting that the coordination sphere of the Mn site in the OEC may contain carboxyl bridges. The possible combination modes between the carboxyl group and the Mn atoms have been suggested. The NMR signals exhibit widening and shift produced by the influence of the paramagnetic Mn" sites. The red-shift of the absorption in IR spectrum was observed to be attributed to the coordination of the carboxyl group to the Mn 相似文献
6.
A nonanuclear Cu4^ⅡTi5^Ⅳheterometallic cluster,[Ti5 Cu4 O6(ba)(16)](1,Hba=benzoic acid)was synthesized in one-pot reaction under the solvothermal condition.The metallic skeleton 1 contains a Ti5 core constructed from two vertex-shared Ti3 triangles and four separated Cu atoms outside which are connected together byμ3-O^2- ions.Total 16 ba ligands adoptμ2-η^1:η^1 coordination mode to protect the overall hetero metallic co re.Due to the unique d-d transitions of Cu^Ⅱion,the reflectance spectrum of 1 displays broad and strong absorption towards visible light extending to the near-infrared region.Moreover,1 shows almost purely paramagnetic behavior with the presence of weak antiferromagnetic interactions at low temperatures. 相似文献
7.
A 2-D coordination polymer, [Co(OBA) 2] ∞ (OBA?=?4,4′-oxy bis(benzoate)), where OBA ligands bridge cobalt in a terminal fashion to build up a 2-D layer structure with strong hydrogen-bonding interaction was isolated and structurally characterized from the reaction of OBA with Co(OAc) 2?·?4H 2O. Magnetic data indicate the Co(II) centers in 1 are negligibly magnetically coupled to each other and the single-ion magnetic behavior of Co(II) in octahedral environment is dominated at low temperature to give an effective S?′?=?1/2 ground state from S?=?3/2 state due to spin–orbit coupling. 相似文献
8.
A series of oxovanadium(IV) complexes: TpVO(pzH)(2,4-Cl–C 6H 3–OCH 2COO) ( 1), TpVO(pzH)(C 6H 5–OCH 2COO) ( 2), TpVO(pzH)( p-Cl–C 6H 4–COO) ( 3), TpVO(pzH)(3,5-NO 2–C 6H 3–COO) ( 4), Tp∗VO(pzH∗)( p-Cl–C 6H 4–COO) ( 5) and Tp∗VO(pzH∗)( p-Cl–C 6H 4–COO) · CH 3OH ( 6) (Tp = hydrotris(pyrazolyl)borate, pzH = pyrazole, Tp∗ = hydrotris(3,5-dimethylpyrazolyl)borate, pzH∗ = 3,5-dimethylpyrazole) were synthesized and their crystal structures were determined by X-ray diffraction. In all the complexes, the vanadium ions are in a distorted-octahedral environment with a N 4O 2 donor set. Hydrogen bonding interaction exists in each complex. Complexes 1 and 2 are hydrogen-bonded dimers. Dimeric units of 2 are connected to one another via weak inter-molecular C–H···O interactions to form a 2D network on the bc-face. In 3– 6 there exist intramolecular N–H···O hydrogen bonds between the neutral pyrazole/3,5-dimethylpyrazole and the uncoordinated carboxyl oxygen atom. In addition, the catalytic activity of complex 2 in a bromination reaction in phosphate buffer with phenol red as a trap was evaluated by UV–Vis spectroscopy. Furthermore, the elemental analyses, IR spectra and thermal stabilities were recorded. 相似文献
9.
An organic–inorganic hybrid Cu II–Er III heterometallic arsenotungstate Na 3[Cu(en) 2(H 2O)][Cu(en) 2] 1.5[H 3Er(α-AsW 11O 39) 2]·4H 2O ( 1) (en = ethylenediamine) has been hydrothermally synthesized and structurally characterized by elemental analyses, IR and UV spectra, X-ray photoelectron spectroscopy (XPS), cyclic voltammetry and single-crystal X-ray diffraction. 1 displays an organic–inorganic 2-D sheet structure constructed by sandwich-type [H 3Er(α-AsW 11O 39) 2] 8− fragments and [Cu(en) 2] 2+ connectors. From the topological viewpoint, if the [H 3Er(α-AsW 11O 39) 2] 8− fragments are viewed as 3-connected nodes and [Cu(en) 2] 2+ connectors are considered as linkers, the 2-D sheet can be simplified into a 2-D (6,3)-network topology. 相似文献
10.
The current study reports the synthesis of a curcumin–silver(I) complex and its preliminary tests against four bacterial strains viz. Staphylococcus aureus, Escherichia coli, Bacillus subtilis, and Bacillus cereus using agar well diffusion method. The results were compared with curcumin by testing it in parallel with the sample. Curcumin showed zones of inhibition against all tested strains of bacteria. Among all bacterial strains, S. aureus was the most sensitive to curcumin with zone of inhibition of 12.2 mm. However, the curcumin–Ag(I) complex did not show the expected enhanced activity against all bacteria. This is perhaps due to the replacement of curcumin phenolic protons by silver ions which might have suppressed the antibacterial property of curcumin. The current research findings suggest that while synthesizing curcumin–metal complexes, the phenolic heads may either be left unaltered or need to be replaced by better substituents than hydroxy groups. Based on the current findings, biologically enhanced models have been provided as future recommendations. 相似文献
11.
In this study, a mononuclear CuL complex was prepared by the use of bis-N,N′-(salicylidene)-1, 3-propanediamine (LH2) and Cu2+ ion. NiCl2 and NiBr2 salt were treated with this complex in dioxanewater medium and two new complexes [(CuL)2NiCl2(H2O)2] and [(CuL)2NiBr2(H2O)2)] with Cu(II)–Ni(II)–Cu(II) nucleus structure were obtained. In addition to this bis-N,N′-(2-hydroxybenzyl)-1,3-diaminopropane (LHH2) was prepared by the reduction of LH2 with NaBH4 in MeOH medium. The treatment of this reduced complex with Cu2+ ion resulted a complex [(CuLH)2CuCl2] with a structure of Cu(II)–Cu(II)–Cu(II). The complexes prepared were characterized by the use of elemental analysis, IR spectroscopy, thermogravimetric and X-ray diffraction methods. The crystal structures of [(CuL)2NiBr2(H2O)2] (СIF file CCDC 1448402) and [(CuLH)2CuCl2] (СIF file CCDC 1448401) complexes were elucidated. It was found that halogen ions are coordinated to terminal Cu2+ ions which are in a distorted square pyramid coordination sphere. It was determined that the central Cu(II), which joins terminal square pyramidal Cu(II), was coordinated only by the phenolic oxygens of the ligand while the central Ni(II) was coordinated by two phenolic oxygens of the organic ligand and two water molecules. These complexes were investigated by XPS and it was found that the terminal and central Cu2+ ions were different in Cu(II)–Cu(II)–Cu(II) complex. Also, the thermal degradation of the CuLH complex unit was observed to exothermic in contrast to the expectations. 相似文献
12.
The amantadinium iodoacetatobismuthate(III) [C 10H 15NH 3·(CH 3) 2CO] 2[BiI 3.67(CH 3COO) 1.33] is a new hybrid halometallate with iodide ions partially replaced by oxygen-containing acetates to form stronger interaction between the anionic and cationic substructures. The title compound as well-shaped orange-red crystals was synthesized by a facile reaction in acetone solution in the presence of glacial acetic acid. The crystal structure of the compound consists of the infinite anionic chains [BiI 3.67(CH 3COO) 1.33] 2– and the countercations [C 10H 15NH 3·(CH 3) 2CO]+; according to the optical absorption data, the test compound is a semiconductor with a band gap of 2.06 eV. 相似文献
13.
A new Keggin-type polyoxometalate-based inorganic–organic hybrid, [Cu(H 2O) 2(daphen)] 2[SiW 12O 40]·9H 2O ( 1) (daphen?=?5,6-diamino-1,10-phenanthroline), was hydrothermally synthesized, and characterized by single-crystal X-ray diffraction, elemental analysis, infrared spectroscopy, fluorescence spectra, and thermal analysis. Single-crystal X-ray diffraction analysis reveals that in 1, [SiW 12O 40] 4? is a tetradentate ligand with its four terminal oxygens coordinating to four Cu(II)–daphen fragments to form a 2D sheet with (4,4) topology. On the basis of the insolubility of 1 in water and common organic solvent and its reversible multielectron redox processes, 1 was used to fabricate a bulk-modified carbon paste electrode ( 1-CPE) by direct mixing. Electrochemistry indicated that 1-CPE is stable over hundreds of cycles and possessed electrocatalytic activity toward the reduction reactions of nitrite. 相似文献
16.
Reaction of [( 3-C 4H 7) 2Rh(CH 3CN) 2]PF 6( 3-C 4H 7 = -methallyl) with [ n-Bu 4N](VO 3) gives a new 3-allyl cluster [ n-Bu 4N] 2[{( 3-C 4H 7) 2Rh} 2 (V 4O 12)] ( I) which is readily converted into a diene cluster, [ n-Bu 4N] 2 [{( 4-C 8H 14)Rh} 2(V 4O 12)] ( II) (C 8H 14=2,5-dimethyl-1,5-hexadiene) by reacting with CO or P(OEt) 3; I and II have been characterized crystallographically. 相似文献
17.
A new Cd(Ⅱ) coordination polymer, namely {Cd_2(L)(biimpy)(H_2O)}_n(1, H4 L = 3-(3?,5?-dicarboxylphenoxy)phthalic acid, biimpy = 2,6-bis(1-imdazoly)pyridine), has been successfully synthesized via the hydrothermal reactions of Cd(Ⅱ) ions, H_4L and biimpy. The crystal structure is of triclinic, space group P1 with a = 7.7874(5), b = 9.9716(5), c = 18.5278(6) ?, α = 91.327(4), β = 96.689(4), γ = 111.896(5)o, V = 1322.39(12) ?~3, C_(27)H_(17)Cd_2N_5O_(10), M_r = 796.26, Z = 2,D_c = 2.000 g/cm~3, F(000) = 780, μ = 1.679 mm~(-1), R = 0.0345 and wR = 0.0767 for 3890 observed reflections(I 2s(I)). Single-crystal X-ray structural analysis reveals that compound 1 features a three-dimensional(3D) framework based on two different dinuclear [Cd_2(COO)_2] building subunits, and topological analysis shows that it can be simplified into a binodal(4,6)-connected topological network with the point symbol of {3.4~2.5~2.6}{3~2.4~2.5~2.6~4.7~4.8}. Moreover, the thermal stability and luminescent property of compound 1 were also studied. 相似文献
19.
An effective synthesis of the multi ring-fused benzoindoloquinolizines has been accomplished by Cu(I)-mediated and MW-assisted C–N amide bond formation of benzo[ a]quinolizin-4-ones. The deamination of tetrahydro-2 H-pyrido[2,1- a]isoquinolines was also studied and was found to give benzoquinolizines. The benzo[ a]quinolizin-4-ones were prepared based on the annulations of C-1 substituted 3,4-dihydroisoquinolines and azlactones. 相似文献
20.
The trinuclear copper complex, [Cu 3(μ 3-OH)(CTMB) 3(NO 3) 2(CH 3CN) 2]·5CH 3CN·H 2O ( 1) {CTMB = cyclohexotriazole-3-(4-methoxybenzamide)}, has been prepared by mixing Cu(NO 3) 2·2.5H 2O and CHMBH {CHMBH = N,N′-cyclohexane-1,2-diylidene-bis(4-methoxybenzoylhydrazide)} in acetonitrile under ambient conditions. Compound 1 was characterized by IR and UV–visible spectroscopies as well as elemental analyses. X-ray crystallography shows that the cluster contains a {Cu 3(μ 3-OH)} core supported by three triazole-based Schiff base ligands. Each Cu is bound to the 2-N of one triazole ring and the 1-N of another. However, the coordination sphere of each Cu is different, one is five-coordinate and the other two are six-coordinate and bridged by a NO 3 group. The six-coordinate sites are different, one has a terminal NO 3 and the other a MeCN ligand. Magnetic measurements revealed the presence of isotropic and antisymmetric exchange between the copper(II) centers. The data were analyzed using the Hamiltonian containing isotropic exchange for an isosceles triangle together with antisymmetric exchange: H = – J1( S1S2 + S2S3)? J2S1S3 + G[ S1 × S2 + S2 × S3 + S3 × S1]. Compound 1 exhibits strong antiferromagnetic coupling with J1 = ?180 and J2 = ?118 cm ?1 and antisymmetric exchange with Gz = 15 cm ?1. Stopped flow spectrophotometric studies show that the formation of 1 occurs in three distinct phases and the kinetics of each phase has been determined. 相似文献
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