6-Me2DBT < 4-MeDBT < DBT < 2,8-Me2DBT. Kinetics studies of the substitution of the DBTh in [CpRu(CO)2(η1(S)-DBTh)]+ by phosphorus donor ligands establish the following order of DBTh lability, 4,6-Me2DBT > 4-MeDBT > DBT > 2,8-Me2DBT, which is consistent with the trend in K‘ values. The most labile DBTh ligand in both series of complexes is 4,6-Me2DBT in [Cp*Ru(CO)2(η1(S)-4,6-Me2DBT)]+, where both steric
的类型的几个络合物的结构研究[CP'Ru(CO)2(η 1(小号)-DBTh)] +,其中CP” = CP或的CP *和DBTH = DBT,4- MeDBT,4,6-我2 DBT,或2,8--ME 2 DBT,显示,仅在的[CP *的Ru(CO)2(η 1(小号)-4,6--ME 2 DBT)] +是有CP之间空间拥挤证据和DBTh
配体。然而,在CP和CP *配合物中DBTh
配体结合的相对平衡常数(K ')在包含4-MeDBT和4,6-Me 2 DBT作为K '的那些中显示出空间效应的证据。值按4,6-Me 2 DBT <4-MeDBT 4 MeDBT> DBT> 2,8-Me 2 DBT,这与K '值的趋势一致。最不稳定的
配体DBTH在两个系列复合物的是4,6--ME 2 DBT中的[CP *的Ru(CO)2(η 1(小号)-4,6--ME 2 DBT)] +,其中CP *
配体的空间拥挤和电子给体都加速了4