Between MOFs and molecules: organolead(IV) compounds with chain structures.

Organolead compounds are of interest mainly as catalysts and organolead halides have proved to be very efficient materials for solar cells. Two organolead(IV) dimethylarsinates, namely catena-poly[[triphenyllead(IV)]-μ-chlorido-[triphenyllead(IV)]-μ-dimethylarsinato-κO:O'], [Pb(CH)(CHAsO)Cl] or [(PhPb)Cl(OAsMe)], (1), and poly[chlorido(μ-dimethylarsinato-κO:O,O':O')diphenyllead(IV)], [Pb(CH)(CHAsO)Cl] or [(PhClPb)(OAsMe)], (2), together with the triphenyllead(IV) diphenylphosphinate catena-poly[[triphenyllead(IV)]-μ-diphenylphosphinato-κO:O'], [Pb(CH)(CHOP)] or [(PhPb)(OPPh)], (3), have been synthesized and characterized by single-crystal X-ray diffraction, IR spectroscopy and mass spectrometry. In (1), a chain structure was found with alternating chloride and Pb-O-As-O-Pb arsinate bridges between five-coordinate Pb atoms. In (2), bidentate and chelate-like bonded dimethylarsinate ligands form double chains with heptacoordinated Pb atoms. In (3), a pentacoordinated Pb atom is connected by Pb-O-P-O-Pb phosphinate bridges to form a linear chain. Obviously, the steric demand of the phenyl ligands at Pb reduces the possibility of interconnections via polydentate ligands to one dimension only. Thus, no metal-organic frameworks (MOF) are formed but instead various chain structures are observed.