EPR and electrochemical studies of bimetallic seventeen-electron molybdenum species exhibiting unusually large interactions across bipyridyl bridging ligands

Abstract

The reactions between [Mo(NO){HB(Me₂pz)₃}Cl₂]^– and L–L[HB(Me₂pz)₃= hydrotris(3,5-dimethylpyrazolyl)borate and L–L = 4,4′-bipyridyl, 3,3′-bipyridyl, 1,2-bi(4-pyridyl)ethane, and trans-1,2-bi(4-pyridyl)ethene] afford the complexes [Mo(NO){HB(Me₂pz)₃}Cl(L–L)] and [{Mo(NO){HB(Me₂pz)₃}Cl}₂(µ-L–L)]; the unpaired electrons in [{Mo(NO){HB(Me₂pz)₃}Cl}₂(µ-L–L)] show large exchange interactions at 300 K.