Ten solid complexes of zinc nitrate with L-α-leucine(Leu), L-α-valine(Val), L-α-tryptophan(Try) and L-α-threonine(Thr) were prepared in water. The compositions of these complexes are determined by chemical analysis and elemental analysis, which are identified as Zn(Leu)(NO3)2·2H2O(A), Zn(Leu)2(NO3)2·H2O(B), Zn(Val)(NO3)2·2H2O(C), Zn(Val)2(NO3)2·H2O(D), Zn(Val)3(NO3)2·H2O(E), Zn(Try)(NO3)2·2H2O(F), Zn(Try)2(NO3)2·H2O(G), Zn(Thr)(NO3)2·2H2O(H), Zn(Thr)2(NO3)2·H2O(I) and Zn(Thr)3(NO3)·H2O(J). The constant-volume combustion energies of the complexes, ΔcU(complex), were determined by a precise rotating bomb calorimeter at 298.15K. Standard enthalpies of combustion,ΔcHm?(complex, s, 298.15K), and standard enthalpies of formation, ΔfHm?(complex,s,298.15K) for these complexes were calculated as (4523.22±2.08), (7208.86±4.28), (3442.21±1.85), (5971.21±3.32), (9007.26±4.24), (5802.35±2.14), (10891.58±3.01), (2147.40±1.28), (4120.83±0.99), (6444.68±3.85)kJ·mol-1 and (615.67±2.27), (1863.16±4.60), (1017.34±2.00), (1742.93±3.61), (2245.70±4.73), (1161.18±2.61), (1829.71±4.20), (1632.82±1.43), (1885.55±1.50), (2770.25±4.21)kJ·mol-1, respectively. 相似文献
The title complex [Mg(H2O)6]·(L)·(H2O) [L=2-formyl-benzenesulfonate-hydrazine] was synthesized by the reaction of magnesium chloride hexahydrate with 2-formyl-benzenesulfonic acid sodium-hydrazine in the CH3CH2OH/H2O. It was characterized by elemental analysis, IR and X-ray single crystal structure analysis. The crystal of the title complex [Mg(H2O)6]·(C14H12N2O7S2)·(H2O) belongs to triclinic, space group P1 with a=0.781 09(12) nm, b=0.781 27(13) nm, c=0.995 68(19) nm, α=102.054(2)°, β=92.331 0(10)°, γ=105.500(2)°, V=0.569 59(17) nm3, Z=1, Dc=1.559 Mg·m-3, μ=0.334 mm-1, F(000)=280, and final R1=0.033 9, wR2=0.091 6. The complex comprises a six-coordinated magnesium(Ⅱ) center, with a O6 distorted octahedron coordination environment. The molecules are connected by hydrogen bonds to form two dimensional network structures. CCDC: 716601. 相似文献
The layered CuII coordination polymer {[Cu(tib)2(H2O)2](NO3)2} ( 1 ) based on the rigid tripodal 1,3,5‐tris(1‐imidazolyl)benzene (tib) ligand was synthesized by hydrothermal methods. By introducing different polycarboxylate coligands from linear 4,4′‐biphthalic acid (H4L1) to V‐shaped thiophene‐2,5‐dicarboxylic acid (H2L2), two new copper(II) compounds were obtained, namely, {Cu(tib)(H2L1)(H2O) · 3H2O} ( 2 ) and {Cu(tib)(L2) · 3H2O} ( 3 ). X‐ray diffraction analyses reveal that compound 2 displays a hydrogen‐bonded three‐dimensional (3D) supramolecular structure, in which protonated {H2L1}2– ligands occupy some coordination sites around the metal atoms to form one‐dimensional (1D) chain by blocking the formation of two‐dimensional (2D) Cu‐tib layer as in compound 1 . Interestingly, compound 3 features a rare twofold interpenetrating binodal seh ‐3,5‐P43212 topological network by synergistic effect of V‐shaped carboxylate group and functionally complementary N‐donor ligand. These compounds were characterized by elemental analyses, thermogravinetric analyses, and photoluminescent spectroscopy. 相似文献
The first organic–inorganic hybrid compound based on the Keggin polyoxometalate and alkali-N-heterocycle ligand [Na4(tib)2(H2O)2(α-HBW12O40)]·2H2O (1) (tib = 1,3,5-tris(1-imidazoly)benzene) was hydrothermally synthesized by utilizing a pH-dependent approach in the POM/Cu/tib reaction systems. X-ray structural analyses reveal that compound 1, formed in pH 5.2, possesses a (3,4,6)-connected 2D net with the (42·5)(46)(33·46·52·64) topology. In addition, electrochemical and electrocatalytic properties of compound 1 were studied by cyclic voltammograms. Compound 1 displayed electrocatalytic activities toward reduction of nitrite. 相似文献
AbstractThree new polyoxometalate-based organic-inorganic hybrid compounds (POIHCs), [Cu(PBI)2(H2O)][{Cu(PBI)(OH)(H2O)}{PW12O40}]·5H2O (1), [Cu(PBI)2(H2O)][{Cu(PBI)2(H2O)}{SiW12O40}]·4H2O (2) and [Cu4(HPO4)(PO4)(H2O)2(PBI)4][PMo12O40]·H2O (3) (PBI =2-(pyridin-2-yl)-1H-benzo[d]imidazole), have been synthesized under hydrothermal conditions. All three compounds were characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis, powder X-ray diffraction and single-crystal X-ray diffraction. In 1 and 2, the Keggin-type polyoxometalate (POM) units are decorated by the {Cu/PBI} metal-organic fragments, together with additional {Cu/PBI} isolated cations, which further stack into 3-D supramolecular frameworks with porous structural features. Compound 3 consists of a rare cationic cluster [Cu4(HPO4)(PO4)(H2O)2(PBI)4]3+ and the Keggin-type POM anion, forming a 3-D supramolecular framework with limited interspaces for the entry of guest molecules. Comparable photocatalytic properties of 1–3 were investigated by the use of methylene blue (MB) and Rhodamine B (RhB) degradation under UV light. All compounds showed good catalytic activity for the degradation of MB in contrast to RhB. The possible catalytic mechanism was discussed based on the size of dye molecules, the low adsorption ability and crystal packing mode of the as-synthesized compounds. Additionally, the electrochemical properties of 1–3 have also been investigated, exhibiting good electrocatalytic performance for nitrite reduction. 相似文献
A dinuclear copper(II) complex, [CuII2(L)2] is afforded by the reaction of CuCl2 · 2H2O with a triazenido ligand, 1-[(2-carboxymethyl) benzene]-3-[2-carboxybenzene] triazene (H2L). Structural investigation shows that the copper-copper distance [2.3985(7) Å] is significantly shorter than the sum of the van der Waals radii of Cu (1.40 Å), suggesting that there are metal-metal bonds in [CuII2(L)2]. In solid, there is a strong antiferromagnetic interaction between copper(II) ions (J = –135.6 cm–1). In homogeneous environment, [CuII2(L)2] shows electrocatalytic activities for hydrogen generation both from acetic acid with a turnover frequency (TOF) of 32 mol of hydrogen per mole of catalyst per hour [mol(H2) · mol–1(catalyst) · h–1] at an overpotential (OP) of 941.6 mV, and neutral buffer with a TOF of 512 mol(H2) · mol–1(catalyst) · h–1 at an OP of 836.7 mV. 相似文献
The coordination polymers {[Zn2(HIDC)2(tib)] · H2O}n ( 1 ) and {[Cd(HIDC)(tib)] · H2O}n ( 2 ) [H3IDC = 1H‐imidazole‐4, 5‐dicarboxylic acid, tib = 1, 3,5,‐tris(1‐imidazolyl) benzene] were obtained under hydrothermal conditions. Their structures were determined by single‐crystal X‐ray diffraction analysis and further characterized by elemental analysis and IR spectroscopy. Complex 1 exhibits a two‐dimensional layer structure with a 63‐hcb topology. Complex 2 has a three‐dimensional structure with a pcu topology. It is shown that the carboxylate ligand can bear diverse structures regulated by metal ions. Additionally, the photoluminescence behaviors of complexes 1 and 2 are discussed. 相似文献
By using an asymmetric ligand with triazole and imidazole groups, three Keggin-based complexes were obtained, [Cu(HMET)4(H2O)2](PMo12O40)2·2H2O (1), [Cu3(HMET)4Cl2(H2O)2(XM12O40)2]·4H2O (X?=?Si, M?=?W 2, X?=?Ge, M?=?Mo 3) (MET?=?4-(2-imidazol-1-yl-ethyl)-4H-[1,3,4]triazole). Complex 1 contains discrete Keggin anions and mono-nuclear [Cu(MET)4(H2O)2]2+ clusters. Complexes 2 and 3 are isostructural with tri-nuclear Cu clusters linked by Keggin anions to construct a 1D chain. The 1- to 3-CPEs show electrocatalytic properties and can also act as nitrite amperometric sensors. Complexes 1–3 exhibit photocatalytic activities for degradation of MB. Complexes 1–?3 own fluorescence sensing properties for detecting Hg2+ ions.
Graphical abstract
By using an asymmetric ligand three POM-based complexes were constructed. The 1– to 3–CPEs exhibit good electrocatalytic activities and can be used as nitrite amperometric sensors. The title complexes show good photocatalytic activities for degradation of MB. Moreover, complexes 1–3 can act as fluorescence sensors to selectively detect Hg2+.