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[(HEt2DTO)PhPt(Me2SO)] reacts with diphenylphosphinomethane and provides the metalloligand [(HEt2DTO)PhPt(dppm‐κP)] (1) (HEt2DTO−, N,N'‐diethyldithiooxamidate; Ph=phenyl; dppm=bis(diphenylphosphino)methane). The uncoordinated phosphorous of the dangling dppm in 1 reacts with complexes as metal [(HEt2DTO)PhPt(Me2SO)] (equimolar quantity) and cis‐[Pt(Me2SO)2Ph2] (half molar quantity) leading to the homobinuclear [(HEt2DTO)PtPh]2(μ‐dppm) (2) and the homo‐trinuclear [(HEt2DTO)PtPh]2(cis‐[PtPh2(μ‐dppm)2]) (3) complexes. 31P and 195Pt NMR analysis was particularly useful for the characterization of these complexes. In the multinuclear complexes 2 and 3 the terminal N‐H...N moieties of the S,S‐coordinated dithioxamidates may also be exploited to coordinate further metal fragments. The metalloligand 1 react with the equimolar quantity of the monofuncionalized complex as metal [(HEt2DTO)PtPh(Me2SO)] or with the half molar quantity of the bifunctionalized complex as metal cis‐[Pt(Me2SO)2Ph2] giving rise to binuclear or trinuclear complexes 2 and 3, respectively. [ABSTRACT FROM AUTHOR]