Dinuclear copper complexes: coordination of Group 14 heteroborates

Dicopper(I) complexes with the chelating dmapm ligand [dmapm = 1,1-bis{di(o-N,N-dimetylanilinyl)phosphino}methane] have been synthesized and characterized structurally. Synthesis of the acetonitrile adduct [Cu-2(mu-dmapm)(CH3CN)(2)][BF4](2) (1) has been presented and the dicopper electrophile has been used as the starting material in reaction with Group 14 heteroborates. Coordination of the c/oso-borates at the dicopper moiety resulted in different molecular structures with varying Cu center dot center dot center dot Cu distances. In the case of the side on coordinated stanna-closo-dodecaborate the tin vertex has been characterized by Sn-119 Mossbauer spectroscopy and the nucleophiticity at the tin was established in reaction with a molybdenum carbonyl complex.