The present study includes important findings relating to the number of donor atoms, species of ligands, and stabilities of complexes. Stabilities of complexes between Cu(II) ion and NO-, NS-, ONS-, and ONO-type Schiff bases were compared. Acid-base properties of the Schiff bases were explained at 25 \pm 0.1 °C and ionic strength (I) of 0.1 M supported by NaCl. The Hyperquad computer program was used for calculation of dissociation and stability constants. The overall stability constants of their Cu(II) complexes were calculated and the various formed complexes between the Schiff bases with Cu(II) ion formulated as CuL_2, CuHL_2, CuH_2L_2, and CuH_-1}L_2 (Cu (OH) L_2). The complexes of ONS- and ONO-type tridentate ligands were more stable than those of NO- and NS-type bidentate ligands.
Conversion of Azomethine Moiety to Carboxamido Group at Cobalt(III) Center in Model Complexes of Co-Containing Nitrile Hydratase
作者:Laurie A. Tyler、Marilyn M. Olmstead、Pradip K. Mascharak
DOI:10.1021/ic0100572
日期:2001.10.1
previously reported bis carboxamido/sulfinatocomplex Na[Co(PyPepSO(2))(2)] (4). The reaction conditions for the various transformation reactions for complexes 1-4 and the structure of 3 are also reported. The mechanism of the -CH=NR + [O] --> -C(=O)NHR transformation has been discussed. The reactions reported here provide convenient alternate routes for the syntheses of Co(III) complexes with coordinated
通过改进的方法合成了席夫碱配体N-2-巯基苯基-2'-吡啶基甲基-亚胺(PyASH)的Co(III)配合物,即[Co(PyAS)(2)] Cl(1)。并且其结构已经通过X射线晶体学确定。两个去质子化的配体围绕Co(III)中心以mer构型排列,整体配位几何形状为八面体。与OH(-)反应后,1中的配偶氮甲胺功能迅速转化为羧酰胺基。该产品是我们先前报告的bis羧酰胺配合物(Et(4)N)[Co(PyPepS)(2)](2)。H(2)O(2)与1在DMF中的反应提供[Co(PyASO(2))(PyPepSO(2))](3),一种具有亚胺和羧酰胺-N供体中心以及S-结合亚磺酸盐。在NaClO(4)存在下与H(2)O(2)进一步反应将3转化为先前报道的双羧酰胺/磺胺基络合物Na [Co(PyPepSO(2))(2)](4)。还报道了配合物1-4的各种转化反应的反应条件和3的结构。讨论了-CH = NR
Synthesis, crystal structure and antibacterial activities of mixed ligand copper(II) and cobalt(II) complexes of a NNS Schiff base
Two new copper(II) complexes of different nuclearities, viz. mononuclear [CuL2(H2O)](ClO4)2 (1), binuclear [Cu2L2(NCS)2(NO3)2] (2) and a mononuclear cobalt(II) complex, [CoL2(NCS)2] (3), whereHL = 2-[pyridin-2-ylmethylidene]amino}benzenethiol, a tridentate Schiff base derived from 2-aminothiophenol and pyridine-2-al have been prepared. The complexes have been characterized by microanalytical, spectroscopic
Spectral Studies of Some Coordination Complexes of Pt(II) and Rh(I) with Benzothiazolines
作者:Archana Garg、Jagdish Prasad Tandon
DOI:10.1246/bcsj.62.3760
日期:1989.11
The present paper describes the synthesis and structural features of platinum(II) and rhodium(I) complexes of some benzothiazolines derived by the condensation of various heterocyclic aldehydes viz. 2-pyridinecarbaldehyde, 2-furancarbaldehyde, and 2-thiophenecarbaldehyde. The resulting complexes have been characterized by elemental analyses, conductance measurements and molecular weight determination
本文描述了由各种杂环醛缩合得到的一些苯并噻唑啉的铂 (II) 和铑 (I) 配合物的合成和结构特征。2-吡啶甲醛、2-呋喃甲醛和2-噻吩甲醛。所得复合物已通过元素分析、电导测量和分子量测定进行表征。这些配合物的键合模式和几何形状已根据 IR、1H NMR、电子光谱和磁性研究提出。