The coordination complexes of Co(II), Ni(II) and Cu(II) with L-serine and its mixed ligand with L-aspartic acid were synthesized and characterized. The compounds were characterized using UV-visible, infrared spectra and metal analyses. Antimicrobial study of the complexes was carried out, the tested microbes included two Gram-positive and five Gram-negative bacteria and one fungus. The results suggested an octahedral geometry for the complexes with L-aspartic acid and L-serine acting as tridentate ligands. The ligands coordinated with the metal ions through N and O donor atoms respectively. The antimicrobial study showed the complexes possess activity against the micro-organisms.
合成并表征了 Co(II)、Ni(II) 和 Cu(II) 与 L-丝氨酸及其与 L-天冬氨酸的混合配体的配位配合物。利用紫外-可见光谱、红外光谱和金属分析对这些化合物进行了表征。对复合物进行了抗菌研究,受试微生物包括两种革兰氏阳性菌、五种革兰氏阴性菌和一种真菌。研究结果表明,L-天冬氨酸和 L-丝氨酸作为三叉配体的配合物具有八面体几何结构。配体分别通过 N 和 O 供体原子与金属离子配位。抗菌研究表明,这些配合物对微生物具有活性。
Reactions of a series of bis(α-amino acidato)copper(<scp>ii</scp>) complexes with formaldehyde and benzamide: aldol-type condensation versus Mannich aminomethylation
作者:Chew Hee Ng、Thiam Seong Chong、Siang Guan Teoh、Farook Adams、Seik Weng Ng
DOI:10.1039/b202955c
日期:——
In the reactions of bis(α-amino acidato)copper(II) with formaldehyde and benzamide, competing processes occur and the preferred pathway depends on the nature and number of the α-carbon substituents of the chelated amino acid, and the pH of the reaction medium. Aldol-type condensation yields complexes with oxazolidine ring(s) while Mannich aminomethylation results in the formation of complexes with N-methylbenzamido pendant arm(s). The crystal structure determination of bis(3-methylbenzamido-5-methyloxazolidine-4-carboxylato)copper(II) dihydrate establishes its formation from a combination of both processes, in which aldol condensation occurs first. The chemistry of these reactions is rationalized with a proposed reaction scheme. The synthesized compounds are characterized by infrared spectroscopy and microanalysis.
A polarimetric study of the reaction of bis(L-serinato)copper(II) with formaldehyde
作者:Soon-Beng Teo、Max J. O'Connor
DOI:10.1016/s0020-1693(00)80066-3
日期:1984.5
Abstract Polarimetric data have shown that the base-catalyzed reaction of bis(L-serinato)copper(II) with excess formaldehyde proceeds via the initial dissociation of the proton on the nitrogen atom of the amino acid chelate. A bis(oxazolidine)copper(II) complex appears as an intermediate but this species is not detected polarimetrically at 50°C and above.
Dual-Stimuli-Responsive <scp>l</scp>-Serine-Based Zwitterionic UCST-Type Polymer with Tunable Thermosensitivity
作者:Tanmoy Maji、Sanjib Banerjee、Yajnaseni Biswas、Tarun K. Mandal
DOI:10.1021/acs.macromol.5b01099
日期:2015.7.28
in this pH range, the two-phase PSA solution becomes one-phase upon heating, exhibiting distinct reversible upper criticalsolution temperature (UCST)-type phase transition. The cloud point (Tp) is found to increase with increasing molecular weights of PSAs. It is also observed that the Tp changes with changing the solution pH, exhibiting highest Tp near the isoelectric point of PSA. Addition of an
Effect of different α-substituents on the Mannich reaction of copper(II) chelated α-amino acids with formaldehyde and acetamide: X-ray structure of aquabis(3-methylacetamido-5-methyl-oxazolidine-4-carboxylato)-copper(II)
The reactions of a series of bis(alpha-substituted glycinato)copper(II) complexes, Cu(aa)(2), with formaldehyde and acetamide have been carried out. For Cu(aa)(2) with an activating alpha-alkyl or reactive alpha-hydroxyalkyl substituent, they undergo both aldol-type condensation and Mannich aminomethylation to yield complexes with an oxazolidine-ring and one methylacetamido pendant. The crystal structure of one of these complexes is reported. The Cu(aa)(2) with a non-activating alpha-alkyl substituent is diacetamidomethylated. A proposed mechanism to account for the above differences and an analysis of thermal decomposition data of the two types of complexes are further described. (C) 2003 Elsevier Science Ltd. All rights reserved.