含N—取代乙二胺类配体的钴(Ⅲ)配合物的研究 Ⅰ.配合物[Co(acac)_2L]^+(L=N—甲基和苯基取代乙二胺类)的合成、稳定性及配体的配位场强度的研究

STUDIES OF THE COBALT (III) COMPLEXES CONTAINING N-SUBSTITUTED ETHYLENEDIAMINE LIGANDSI .PREPARATION AND STABILITY OF THE COMPLEXES[Co(acac)_2L)+(L = N-METHYL OR PHENYL-SUBSTITUTED ETHYLENEDIAMINE) AND STUDIES OF LIGAND FIELD STRENGTHS

利用原料配合物[Co(acac)_3]和N-甲基和苯基取代乙二胺类配体在甲醇溶媒和活性炭的存在下进行反应,合成了一系列新的八面体型[Co(acac)_2L]^+(L=N-甲基和笨其取代乙二胺类配体,acac=2,4-戊二酮离子)配合物。本文合成的七种配合物的分离和纯化都是采用以SP—SephadcxC 阳离子交换树脂为填充剂的柱型色谱技术进行的。所有配合物的紫外可见吸收光谱的第吸收带都在16600-18300cm^(-1)范围,表明~1A_(1g)→T_(2g)(O_h)的跃迁。并对N-甲基和苯基取代乙二胺配体的配位场强度进行了研究。

A scries of complexes of the type [Co(acac)2L]+where acac-2,4-pentanedianate non and L denotes R1R2NCH2CH2NR3R4(RI-R4= H, CH3, C6H5, ) were prepared from complex [Co (acac)3] and N-methyl or phcnyl-substituted ethylcnediamine ligands in methanol in the presence of active charcoal. All the complexes prepared in the present study were purified and isolate by column chromatography on SP-Sephadex C-25 exchanger. The absorption spectra of these complexes show the first absorption band, 1A -T2g(Oh) in the region or 16600cm-1to 18300cm-1. The ligands' ligand field strengths and stability of complexes were studied.