Synthesis and properties of a novel polyester containing bithiazole

A novel Schiff base type polyester containing 2,2’-diamino-4,4’-bithiazole(DABT) was prepared by low-temperature interface polycondensation of 1,4-benzenedicarbonyl dichloride with 4,4’-(4,4’-bithiazole-2,2’-diylbis(imine-2,1-diyl)diphenol(BDDP), which is derived from a 2,2’-diamino-4,4’-bithiazole(DABT) Schiff base reacted with a 4-hydroxybenzaldehyde monomer.The newly generated polyester was evaluated based on characterization of its solubility,FTIR spectroscopy,elemental analysis,X-ray diffraction measurements and thermogravimetric analysis(TGA) studies.     

Synthesis and Crystal Structure of a Cadmium(II) Complex with 2,2′-diamino-4,4′-bis-1,3-thiazole

Crystals of the title complex with diaminobithiazole (DABT) were obtained by a solution diffusion method. X-ray diffraction analysis shows the complex to be monoclinic, space group P2₁/c with cell dimensions a=11.684(2), b=13.625(2), c=14.859(1) Å and β=109.970(7)°; R=0.026. The Cd(II) atom lies in a distorted octahedral environment with two DABT and two Cl ligands in a cis arrangement. The average internal dihedral angle of 9.3° between thiazole rings of DABT shows the twisted structure of the ligand in the complex. The Cd(II) atom deviates by some -0.570 Å from the mean plane of the thiazole ring containing N(4), but the Cd-N(4) bond is the shortest among four Cd-N bonds in the structure. Intramolecular H-bonds between Cl atoms and amino groups stabilize the cis-configuration of the complex.     

含双噻唑基聚合物的合成及电流变性能研究

采用2，2’-二氨基-4，4’-双噻唑与联苯胺合成一种含有双噻唑基的共轭聚合物，通过红外、扫描电镜、热重分析等测试了该物质的结构及热稳定性等，并通过将聚合物分别分散在硅油和溴代二苯甲烷中制备电流变体，测试其电流变性能。结果表明：含双噻唑基的共轭聚合物作为电流变体的分散相表现出了良好的电流变性能，同时发现分散相和分散介质的密度相近时有利于电流变性能的提高。     

Nanoparticles of a new zinc(II) coordination polymer: synthesis,characterization, thermal,and structural studies

Nanoparticles of a Zn(II) coordination polymer {[Zn(DADMBTZ)(CH₃COO)₂] _n , DADMBTZ?=?2,2′-diamino-5,5′-dimethyl-4,4′-bithiazole} were synthesized by reaction of Zn(NO₃)₂?·?4H₂O, CH₃COONH₄ and DADMBTZ by a sonochemical method. The nanoparticles were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), and Fourier transform infrared (FT-IR) spectroscopy. [Zn(DADMBTZ)(CH₃COO)₂] _n was structurally characterized by single-crystal X-ray diffraction. In this four-coordinate compound with nearly C₂ symmetry, DADMBTZ is bidentate. The metal lies in a pseudo-tetrahedral environment and is ligated by the two bithiazole ring nitrogen atoms and an oxygen from each of the two monodentate acetates; 2-D networks are formed via N–H···O hydrogen bonds. Thermal stability of [Zn(DADMBTZ)(CH₃COO)₂] _n was studied by thermal gravimetric and differential thermal analyses. A ZnO nanostructure was obtained by direct thermolyses at 500°C under air. The ZnO nanostructure was characterized by SEM, XRD, and FT-IR spectroscopy.     

Indium(III) complexes containing bithiazole derivatives,chloride, methanol,and dimethyl sulfoxide: X‐ray studies,spectroscopic characterization,and thermal analyses

[In(dm4bt)Cl₃(MeOH)]?·?0.5dm4bt (1) (dm4bt is 2,2′‐dimethyl‐4,4′‐bithiazole) and [In(4bt)Cl₃(MeOH)] (2) (4bt is 4,4′‐bithiazole) were prepared from the reaction of 4,4′‐bithiazole and 2,2′‐dimethyl‐4,4′‐bithiazole with InCl₃?·?4H₂O in methanol, respectively. [In(4bt)Cl₃(DMSO)] (3) was also prepared from recrystallization of 2 in DMSO. These complexes were characterized by IR, UV‐Vis, ¹H NMR, ¹³C{¹H} NMR, and luminescence spectroscopy and their structures were studied by single‐crystal X‐ray crystallography. The thermal stabilities of 1 and 3 were studied by thermogravimetric and differential thermal analyses.     

Complexation of 4,4′-di(tert-butyl)-5-ethynyl-2,2′-bithiazole with mercury(II) ion: Synthesis, structures and analytical applications

Two new mononuclear mercury(II) alkynyl complexes containing substituted bithiazole unit [R-CC-HgMe] (2) and [R-CC-Hg-CC-R] (3) (R = 4,4′-di(tert-butyl)-2,2′-bithiazol-5-yl) were prepared in good yields by mercuration of 4,4′-di(tert-butyl)-5-ethynyl-2,2′-bithiazole (1) at room temperature via the dehydrohalogenation reaction of MeHgCl and HgCl₂ with terminal acetylene R-CCH. The structures of the title compounds were characterized by NMR and IR spectroscopy, FAB mass spectrometry, X-ray crystallography and luminescence spectra. A new protocol for derivatization of inorganic and organic mercury(II) ions to mono- and dialkynyl mercury(II) compounds followed by extraction into dichloromethane is suggested, which can be effectively analyzed by HPLC technique using UV detection. The proposed procedure can offer a new opportunity for the simultaneous determination of inorganic Hg(II) and MeHg(II) in aqueous solutions.     

含双噻唑高分子及其螯合物的制备和磁性能研究进展

设计和合成有机及高分子磁性材料是当前国内外十分关注的课题,本课题组在先前研究的基础上,以电子理论和磁性理论为指导,从分子设计出发,合成出含双噻唑新型芳杂环聚合物及其过渡金属离子或稀土离子螯合物,测定了它们的磁性能,研究高分子结构、螯合物组成与磁性能的关系,探索产生磁性的机理.发现本研究体系的高分子螯合物具有顺磁居里温度(Tp)高,剩余磁场(Mr)少,矫顽力(Hc)低,是一类很好的软磁性材料,呈现出有一定特色的磁性能.本文综述了含双噻唑高分子过渡金属螯合物、稀土金属螯合物、纳米碳管接枝高分子及其螯合物的制备和磁性能研究,以及典型螯合物的非常规磁性现象的发现和机理探索研究.     

CNDO/S Method Interpretation of Ultraviolet Spectra of Bithiazoles

Abstract

The uv spectra of five bithiazoles are reported. These experimental results are interpreted using CNDO/S method (Complete Neglect of Differential Overlap for Spectroscopy). Calculations show that the observed transitions are π→π? type transitions.     

PREPARATION AND MAGNETIC PROPERTIES OF POLY(SCHIFF BASE) COMPLEXES CONTAINING PHENANTHROLINE UNITS

Two poly(Schiff base)s (PDBT and PDPE) were synthesized by polycondensation of 1,10-phenanthroline-5,6- dione (PD) with 2,2′-diamino-4,4′-bithiazole (DABT) and 4,4′-diaminodiphenyl ether (DAPE),respectively.The structures of the polymers were determined by FTIR and element analysis.The metal (Fe~(2+),Ni~(2+)) complexes were prepared from the polymers with FeSO_4 or NiSO_4,and the metal contents of the complexes were measured by complexometric titration.The magnetic behaviors of the complexes were examine...