in each case. For tungsten, [AsCCAs]WCl3 (6) was reduced under N2 to afford [AsCCAs]WCl2}2(N2) (7), which is best described as a dinuclear π8δ4-configured μ-(η1: η1)-N2-bridged dimer. Attempts to reductively cleave the N2 unit in 7 did not lead to the expected tungsten nitride (8), which had to be prepared independently via the treatment of 7 with sodium azide. To arrive at a π10δ4-configured N2-bridged
制备带有 2,2'-( i Pr 2 As) 2 -取代的二
苯乙炔 ([AsCCA], 1-As ) 的卤化
钼、卤化
钨和卤化
铼,并在氮气气氛下还原以激活后一种底物。就
钼而言,二
碘 ( 2-As ) 和三
碘钼前体 ( 5 ) 同样适合还原 N 2分裂,从而导致 [AsCCAs]MoeqN(I) ( 3-As ) 的分离在每种情况下。对于
钨,[AsCCAs]WCl 3 ( 6 ) 在 N 2下被还原,得到 [AsCCAs]WCl 2 } 2 (N 2 ) ( 7 ),最好将其描述为双核 π 8 δ 4配置的 μ-( η 1 : η 1 )-N 2 -桥联二聚体。尝试还原裂解7中的N 2单元并没有产生预期的
氮化钨( 8 ),其必须通过用
叠氮化
钠处理7来独立制备。为了在四方扭曲
配体环境中获得π 10 δ 4构型的N 2桥联二聚体,[AsCCAs]ReCl 3 ( 9 ) 在N 2存在下被还原。 正如预期的那样,形成了