and 6+PF6- are isolated, H+ being the oxidizing agent. The X-ray structures of 4+PF6-.CH2Cl2, 5+PF6-.H2O, and 6+PF6- have been determined. In the monoradical 4+ the azo N-N bond lengths in the two chelate rings are 1.284(6) and 1.336(6) A, showing that the radical electron is localized in the latter ring. The half-filled extended Hückel HOMO is indeed found to be so localized, and it has a large azo
二
氢化物[RuII(H)2(CO)(PPh3)3],3与过量的偶氮-
2,2'-联吡啶(abp)在沸腾的干燥苯中的反应提供了双自由基双螯合物[RuII(abp.- )2(CO)(PPh3)],4和氢化单螯合物单自由基[RuII(abp .-)(H)(CO)(PPh3)2],5。3和2-(对
氯苯基偶氮)之间的相似反应)
吡啶(Clpap)没有生成双螯合物,但已分离出羟基单自由基[RuII(Clpap .-)(H)(CO)(PPh3)2] 6。在湿的
二氯甲烷-
乙腈介质中用NH 4 PF 6处理4-6时,分离出单电子氧化的盐4 + PF 6-,5 + PF 6-和6 + PF 6-,其中H +为氧化剂。已确定4 + PF6-.
CH2Cl2、5 + PF6-.
H2O和6 + PF6-的X射线结构。在单自由基4+中,两个螯合环中的偶氮NN键长为1.284(6)和1.336(6)A,说明自由基电子位于后一