作者机构:
[Zhang Chun-Hua] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.;Hunan Inst Technol, Dept Chem Engn, Hengyang 421008, Hunan, Peoples R China.
通讯机构:
[Zhang Chun-Hua] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
关键词:
锰配位聚合物;水热法;晶体结构
摘要:
A manganese coordination polymer [Mn(3,5-Me2PhCO2)(2)(phen)](n)(phen=1,10-phenanthroline) has been synthesized by hydrothermal methods. The crystal structure was determined by single-crystal X-ray diffraction. The crystal is of triclinic, space group P1 with a=0.7703(4) nm, b=1.1452(6) nm, c=1.5370(9) nm, alpha=78.182(9)degrees, ss= 77.170(9)degrees, gamma=89.784(9)degrees, V=1.2928(12) nm(3), Z=2, M-r=533.47,D-c=1.370g center dot cm(-3), mu=0.549 mm(-1), F(000)=554, R-int= 0.0434, R=0.0608 wR=0.148 4. In the crystal the manganese atom is six-coordinated by two nitrogen atoms from phen and four oxygen atoms from four 3,5-dimethylbenzolate molecules, completing an octahedral geometry. And the title complex forms one-dimensional chain structure through bridging 3,5-dimethylbenzolate molecules.
摘要:
Based on hydrophobic and electrostatic interactions, a norfloxacin (NOF) imprinted polymer (PI) was prepared by the combined use of bismethacryloyl-beta-cyclodextrin (BMA-beta-CD) and 2-(diethylamino)ethylmethacrylate (DEAEM) as functional monomers. Compared with the molecularly imprinted polymers (MIPs) using only BMA-P-CD or DEAEM as a functional monomer, P-2 and P-3, respectively, P, showed higher binding affinity and specificity for NOF in aqueous media. Scatchard plot analysis revealed that two classes of binding sites were formed in the imprinted polymer with dissociation constants of 0.32 mu mol/ml and 1.19 mu mol/ml, respectively. It demonstrated that the combination of hydrophobic effect and electrostatic interaction in molecular imprinting was essential for the improvement of the selective ability of the imprinted polymer. Factors that influenced rebinding of the imprinted polymer including pH, water content in the adsorbed solution were explored. (C) 2007 Elsevier B.V. All rights reserved.
摘要:
A novel manganese(Ⅱ) coordination polymer [Mn(L~1)_2(H_2O)]·2H_2O (HL~1 = 2,6-dichlorobenzoic acid) 1 has been synthesized and structurally characterized. X-ray diffraction analyses reveal that 1 is a one-dimensional chain structure bridged by water molecules and 2,6-dichlorobenzoic acid. The crystal is of monoclinic, space group P2_1/c with a = 12.9701(19),b =20.592(3),c = 7.3759(10) (A),β = 102.660(2)°,V = 1.9221(5) nm~3,Z = 4,C_(14)H_(12)Cl_4MnO_7,M_r=488.98,D_c = 1.690 g/cm~3,μ = 1.275 mm~(-1),F(000) = 980,R_(int) = 0.0348,R = 0.0350,and wR =0.0755.In the crystal the manganese atom is six-coordinated by two oxygen atoms from water and four oxygen atoms from four 2,6-dichlorobenzolate molecules, completing an octahedral geometry.
摘要:
The title compound, [Mn(2,4,6-TMBA)2(H2O) 3]n·2nH2O (1), where 2,4,6-TMBA=2,4,6-trimethylbenzoic acid, was synthesized and its crystal structure was determined by X-ray diffraction analysis. The crystal is of monoclinic, space group C2/c with a=2.9299(6) nm, 6=1.0364(2) nm, c=8.22204(17) nm, V=2.4947(9) nm3, Z=4, M=471.40, Dc=1.255 g·cm-3, μ=0.571 mm-1, F(000)=996, R int=0.0294, R=0.0376 and wR=0.0949. The Mn atoms are octahedrally coordinated by two O atoms of two ligands and four O atoms of water. The carboxyl group coordinates to Mn(II) in the mode of monodentate, while the O atoms of water molecules coordinates in bridging mode. The complex shows a one-dimensional chain structure bridged by water molecules.
摘要:
A novel complex tri(o-bromobenzyl)tin ferrocenecarboxylate has been synthesized and its crystal structure was determined by X-ray diffraction. It belongs to orthorhombic, space group Pbca with a = 1.1340(3), b = 1.7823 (4), c = 3.0119(8) nm, V = 6.088(3) nm~3, M_r = 857.81, Z = 8, D_c = 1.872 g/cm~3, μ(MoKα) = 52.63 cm~(-1), F(000) = 3328, R = 0.0683 and wR = 0.1057. The tin atom adopts a distorted tetrahedral coordination geometry. Further studies on the title com- plex have been performed with quantum chemistry calculation at the Lanl2dz basis set level using G98W package. The stability of the complex, some frontier molecular orbital energies and com- position characteristics of some frontier molecular orbitals have been investigated.
作者机构:
[Deng, YF; Feng, YL; Chen, MS; Kuang, DZ; Zhang, CH] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
通讯机构:
[Kuang, DZ] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
关键词:
二丁基锡配合物;席夫碱;合成;晶体结构
摘要:
The title complex {[nBu2Sn(2-OHC6H 4CH=NC6H4COO)]20} 2·2H2O was synthesized by the reaction of N-(4-carboxyphenyl)-salicylideneimine with dibutyltin(IV) oxide in 1:1 molar ratio. The compound has been characterized by elemental analysis, IR, 1H NMR spectra and X-ray single crystal diffraction. It crystallizes in triclinic system with space group P1̄. The crystal data are: a=1.2429(2) nm, b=1.261 3(2) nm, c=1.5949(3) nm, α=102.06(2)°, β= 92.884(3)°, γ=95.939(3)°, Z=2, Dc=1.342 g·cm-3, F(000)=1 000, V=2.425 2(7) nm3, R 1=0.041 5, wR2=0.1044. The compound is in centro-symmetric dimer structure mode with a four-member central endo-cyclic Sn 2O2 unit in which the bridging oxygen atoms are tri-coordinated. All the tin atoms are five-coordinated with geometry of distorted trigonal bipyramid. CCDC:286105.