Singlet Diradical Complexes of Chromium, Molybdenum, and Tungsten with Azo Anion Radical Ligands from M(CO)<sub>6</sub> Precursors
作者:Anasuya Sanyal、Sudipta Chatterjee、Alfonso Castiñeiras、Biprajit Sarkar、Priti Singh、Jan Fiedler、Stanislav Záliš、Wolfgang Kaim、Sreebrata Goswami
DOI:10.1021/ic700584x
日期:2007.10.1
diamagnetic complexes M(mer-L)(2), M = Cr, Mo,W (1a,b, 2a,b, and 4a,b), were obtained by reacting the hexacarbonyls M(CO)(6) with the tridentate ligands 2-[(2-N-arylamino)phenylazo]pyridine (HL = NH(4)C(5)N=NC(6)H(4)N(H)C(6)H(4)(H) (HL(a)) or NH(4)C(5)N=NC(6)H(4)N(H)C(6)H(4)(CH(3)) (HL(b))) in refluxing n-octane. In the case of M = Mo, the dinuclear compounds [Mo(L)(pap)](2)(mu-O) (3a,b) (pap = 2-(phenylazo)pyridine)
通过使六羰基M(CO)(6)与三齿配体2-[((2-N-芳基氨基)苯基偶氮]吡啶(HL = NH(4)C(5)N = NC(6)H(4)N(H)C(6)H(4)( H)(HL(a))或NH(4)C(5)N = NC(6)H(4)N(H)C(6)H(4)(CH(3))(HL(b) ))在回流的正辛烷中。在M = Mo的情况下,获得了双核化合物[Mo(L)(pap)](2)(mu-O)(3a,b)(pap = 2-(苯基偶氮)吡啶)作为第二产物。潮湿的溶剂。Cr(L(b))(2)(1b),Mo(L(a))(2)(2a)和W(L(a))(2)(4a)的X射线衍射分析显示相当多扭曲的八面体结构,带有转位的偶氮原子和顺式的2-吡啶基氮原子和苯胺氮原子。N(偶氮)-MN(偶氮)角大于170度,而其他两个反角较小,约为155度(M = Cr,1b)或146度(M = Mo,W; 2a,4a),由于三齿配