Complexes of 1,3-bis(diphenylphosphino)propane (dppp) with dichloroplatinum(II) and bis(chlorogold(I)): Intramolecular versus intermolecular AuI-AuI association of (m-dppp)(AuCl)2 in catena and cyclo forms. Zeitschrift fuer Anorganische und Allgemeine Chemie, (631)8:1355--1358, 2005. [PUMA: chloro complex complex;propanediphosphine crystal dinuclear gold mononuclear platinum prepn propanediphosphine structure]