spectra of the new complexes are described. A secondary 13C/12C isotope effect on the 31P NMR chemical shifts of ca. 0.025 ppm is noted in several compounds. Comparisons of these osmium(II) compounds with analogous ruthenium species suggests that the former have stronger metal−ligand bonds, are slower to undergo nucleophilic substitution reactions, and are stronger reducing agents.
描述了由from(III)化合物(C 5 Me 5)2 OS 2 Br 4制备几种新的(五
甲基环戊二烯基)OS (II)配合物的方法。其中包括
化学计量为(C 5 Me 5)OSL 2 Br和(C 5 Me 5)OSL 2 H的膦和烯烃配合物,以及亚
硝酰基配合物(C 5 Me 5)OS(NO)Br 2。用PPh 3处理(C 5 Me 5)2 OS 2 Br 4在
乙醇中或在
二氯甲烷中的PMe 3中提供afford (II)络合物(C 5 Me 5)OSL 2 Br,其中L = PPh 3或PMe 3;1,5-
环辛二烯配合物(C 5 Me 5)OS(cod)Br可以在
乙醇中类似地制备。的治疗要么PPH 3(C:或在回流的
正庚烷,得到这个类的几个其它化合物鳕复杂与其它叔膦5我5)OSL 2 BR,其中L = PET 3,1 / 2我2 PCH 2 PME 2,1 / 2我2 PCH 2 CH 2 PME