First structural example of a metal uncoordinated mesoionic imidazo[1,5-a]pyridine and its precursor intermediate copper complex: an insight to the catalytic cycle
作者:Suprakash Roy、Saleem Javed、Marilyn M. Olmstead、Apurba K. Patra
DOI:10.1039/c1dt11435b
日期:——
forms a mesoionic imidazo[1,5-a]pyridine, namely, 3-(imino-N′-2-methylthiophenyl)imidazo[1,5-a]pyridinium-1-thiolate (2) and a thiocyanato bridged Cu(I) complex, [Cu(SCN)(CH3CN)]n (3). The X-ray crystal structure of 1 confirms the presence of square-pyramidal Cu(II) and tetrahedral Cu(I) ions in N3S2 and N2S2 coordination environments, respectively, bridged to each other viathiocyanate anion. The Cu(II)
已经合成了三齿席夫碱配体2-吡啶基-N-(2'-甲硫基苯基)亚甲基亚胺L 1的四个铜配合物。所有这些种类,即[L 1 Cu 2(SCN)3 ] n(1),[Cu(SCN)(CH 3 CN)] n(3),[(L 1)Cu(N 3)(Cl) ](4)和[(L 1)Cu(N 3)(SCN)](5)已经在结构上表征。复杂1中乙腈促进了铜的环加成(II)结合的SCN -离子为L 1的是排他地和化学计量地形成介离子咪唑并[1,5-一个]吡啶,即,3-(亚氨基Ñ '-2甲硫基苯基)咪唑并[1,2 5- a ]吡啶-1-硫醇盐(2)和硫氰酸根桥连的Cu(I)络合物[Cu(SCN)(CH 3 CN)] n(3)。X射线晶体结构1证实了N 3 S 2和N 2中存在方形锥体Cu(II)和四面体Cu(I)离子。S 2配位环境分别通过硫氰酸根阴离子彼此桥接。在Cu(II)离子键合到一个三齿配体L 1和两个SCN -