Exclusive selectivity of multidentate ligands independent on the oxidation state of cobalt: influence of steric hindrance on dioxygen binding and phenoxazinone synthase activity
作者:Anangamohan Panja
DOI:10.1039/c3dt53546k
日期:——
the acyclic Schiff dibasic form of the ligands over the heterocyclic analogues, and this selectivity is found to be insensitive to the oxidation state of cobalt. Other first row transition metals have been characterized in either form of the ligands in their complexes but it is specific for cobalt established in the present study. The pronounced effect of the methyl substitutions is observed from their
本报告描述了合成,表征,晶体结构和两个过氧桥接羰基二钴的phenoxazinone合酶活性的研究(III)络合物,[CO 2(L 1)2(μ-O 2)](CLO 4)4 · 2CH 3 CN(1)和[CO 2(L 2)2(μ-O 2)](CLO 4)4(2),以及三个单核钴(II)配合物,[CO(L 3)(CH 3 CN )](ClO 4)2(3),[Co(L 4)(H 2 O)](ClO 4)2(4)和[Co(L 5)(H 2 O)](ClO 4)2(5),来自五齿形配体L 1 –L 5,它们是三胺与2-乙酰基吡啶或2-吡啶甲醛(6-甲基-2-吡啶甲醛)的1:2缩合产物。X射线晶体学揭示了配体的非环状席夫二价基形式对杂环类似物的唯一选择性,并且发现该选择性对钴的氧化态不敏感。其他第一排过渡金属已经以其配合物中的任何一种配体形式进行了表征,但它对本研究中建立的钴具有特异性。从它们的晶体结构