Thermal analysis applied to the study of metal complexes: thermal behaviour of 6-amino-2-thiouracil and its complexes with several transition metal ions
摘要:
The thermal decomposition processes of 6-amino-2-thiouracil and its Co(II), Ni(II), Cu(I), Ag(I), Zn(II), Cd(II) and Hg(II) complexes ha been studied by TG and DSC techniques. Heats of dehydration have been calculated from the DSC curves. Infrared spectroscopy applied to some of these complexes heated in air has elucidated thc decomposition steps and the nature of the intermediate products. The pyrolysis of these compounds ends between 600 and 800-degrees-C with different products as final residues.
Spectral, electrical conductivity and biological activity properties of some new azopyrimidine derivatives and their complexes
作者:Mamdouh S. Masoud、Ekram A. Khalil、Ahmed M. Ramadan、Yousry M. Gohar、Amr Sweyllam
DOI:10.1016/j.saa.2006.07.047
日期:2007.7
The electronic absorption spectra of 5-(o-substituted phenylazo)-6-amino-2-thiouracils and 6-(o-substituted phenylazo)-5-aminouracils containing different substituents are studied at different pH's. The dissociation constants are evaluated and discussed. Phenomenon of tautomerism is more supported by (1)H NMR and (13)C NMRspectra. The electrical conductivity of some ligands and their Co(II), Ni(II)
在不同的pH值下研究了5-(邻取代苯基偶氮)-6-氨基-2-硫尿嘧啶和6-(邻取代苯基偶氮)-5-氨基尿嘧啶的取代基的电子吸收光谱。离解常数进行了评估和讨论。(1)1 H NMR和(13)C NMR光谱更支持互变异构现象。在293-150K的温度范围内,某些配体及其Co(II),Ni(II)和Cu(II)配合物的电导率有利于它们的半导体性能,其中金属离子形成桥以促进电流流动。测试了一些配体及其复合物对多种革兰氏阳性和革兰氏阴性细菌的生物活性。结果表明,某些化合物对某些生物具有很好的活性。
Transition metal complexes of 6-amino 2-thiouracil; crystal structure of bis(6-amino-2-thiouracilato)aquazinc(II) dihydrate
作者:M. Angustias Romero、M. Purificación Sánchez、Miguel Quirós、Francisco Sánchez、Juan Manuel Salas、Miguel N. Moreno、René Faure
DOI:10.1139/v93-004
日期:1993.1.1
Complexes of 6-amino-2-thiouracil (H2ATU) with the metal ions Ni(II), Co(II), Zn(II), Cd(II), Cu(I), Ag(I), and Hg(II) have been isolated and characterized by means of elemental analysis, infrared, NMR, and visible spectroscopies, and magnetic measurements. The crystalstructure of [Zn(HATU)2(H2O)] • 2H2O has been solved by X-ray diffraction showing that the metal atom is five-coordinated by a water