1,1'-Bis(diphenylphosphino)ferrocene (dppf) complexes of gold(I) and gold(III). Crystal structures of [(dppf)AuPPh3]ClO4.cntdot.CHCl3 and [(dppf)Au(.mu.-dppf)Au(dppf)](ClO4)2.cntdot.2CH2Cl2

Displacement of tetrahydrothiophene in gold(I) complexes such as [AuX(tht)] or [Au(tht)L]ClO 4 by the 1,1'-bis(diphenylphosphino)ferrocene ligand leads to the neutral [(dppf)(AuX) 2 ] [X=C 6 F 5 (1), Cl (2)] or cationic dinuclearcomplexes [(dppf)(AuL) 2 ](ClO 4 ) 2 [L=CH 2 PPh 3 (3),CH 2 PPh 2 Me(4), CH 2 PPhMe 2 (3)]. Otherdinuclear complexes have been prepared by substitution reactions of compound 2, namely [(dppf)(AuL) 2 ] n+ [L=SCN, n=0 (6); L=tht, n=2 (7)]