2-Azaallenylidene complexes: syntheses and structures of chromium and tungsten complexes with a (cyclopropenylidene)-2-azaethenylidene ligand
作者:Matthias Tamm、Thomas Bannenberg、Alexander Grzegorzewski、Roland Fröhlich
DOI:10.1016/s0022-328x(00)00714-2
日期:2001.1
The reactions of NEt4[(CO)5M(CN)] (M=Cr, W) with chloro-bis(diisopropylamino)cyclopropenylium salts [ClC3(NiPr)2]X, (1)X (X=ClO4, OSO2CF3), afford cationic 2-azaallenylidene complexes [(CO)5M=C=N=C3(NiPr)2]+A↔[(CO)5MCNC3(NiPr)2]+B} (M=Cr, 2a; M=W, 2b), in which C3(NiPr)2 represents the bis(diisopropylamino)cyclopropenylidene or bis(diisopropylamino)cyclopropenylium moiety, respectively. The IR
净的反应4 - [(CO)5 M(CN)](M =的Cr,W)与氯二(二异丙氨基)cyclopropenylium盐[ClC 3(N我PR)2 ] X,(1)X( X = CLO 4,OSO 2 CF 3),得到阳离子2- azaallenylidene络合物[(CO)5 M = C = N = C 3(N我PR)2 ] +甲↔[(CO)5 MC NC 3(N我PR)2 ] +乙}(M =铬,2A ; M = W,2B),其中C 3(N i Pr)2分别代表双(二异丙氨基氨基)环丙烯基或双(二异丙氨基氨基)环丙烯基部分。铬配合物(2a)X(X = ClO 4,OSO 2 CF 3)和钨配合物(2b)[(CO)5 W(CN)]的IR和NMR光谱表征显示出异常高的π受体2-杂氮烯基亚基配体的能力和金属异杂异丙苯体系中的高度电子离域化。(2b) [(CO)5的X射线结构测定W(CN)]