Synthesis, structure and properties of mononuclear cobalt(II) and cobalt(III) pseudohalide complexes containing N-donor Schiff bases: Synthetic control of metal oxidation levels
作者:Sk Hafijur Rahaman、Habibar Chowdhury、Doyel Bose、Rajarshi Ghosh、Chen-Hsing Hung、Barindra Kumar Ghosh
DOI:10.1016/j.poly.2005.05.010
日期:2005.9
electron transfer study in MeCN solutions shows cobalt(III)–cobalt(II) response as oxidative in 1 and reductive in 2. Available information shows that the structures 1a, 1b, 1d–1f are cognate with 1c, whereas 2a, 2c, 2d–2f are iso-structural with 2b. All the complexes display intraligand 1(π–π*) fluorescence and intraligand 3(π–π*) phosphorescence in glassy solutions (MeOH at 77 K).
[Co(L 1)(X)2 ](1a – 1f)和[Co(L 2)(X)3 ](2a – 2f)类型的两个不同的钴(II)和钴(III)配合物系列,分别[L 1 = N,N ′-(双(吡啶-2-基)亚甲基)丙烷-1,3-二胺(pfpd)或N,N ′-(双(吡啶-2-基)亚苄基)丙烷- 1,3-二胺(pbpd); L 2 =(N,N-二乙基,N '-(吡啶-2-基)甲叉基)乙烷-1,2-二胺(pfed)或(N,N-二乙基,N '-(吡啶-2-基)亚苄基)乙烷-1,2-二胺(pbed); X = N3- ,NCS -或NCO - ]已经制备和使用微量分析,光谱,磁的,电化学的和其他物理化学特征的结果。通过X射线衍射测量可解析每个系列中一个成员的结构,即[Co(pfpd)(NCS)2 ](1c)和[Co(pbed)(N 3)3 ](2b)。协调领域的定义。结构分析显示1c中的钴(II)中心采用扭曲的八面体环境和CoN