Loosely bonded adducts of plumbocene; structures and solution dynamics of [(η-C5H5)2Pb·tmeda] and [(η-C5H5)2Pb·4,4′-Me2bipy](tmeda = Me2NCH2CH2NMe2, 4,4′-Me2bipy = 4,4′-dimethylbipyridine)

Abstract

The first Lewis-base adducts of a neutral p-block group metallocene, [(η-C₅H₅)₂Pb·tmeda] 1 and [η-C₅H₅)₂Pb·4,4′-Me₂bipy] 2, result from the addition of tmeda and 4,4′-Me₂bipy to [Pb(η-C₅H₅)₂](1:1 equiv.); X-ray and solution studies reveal that the Lewis bases are only loosely associated to the Pb^II centres in these complexes.