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The unique zwitterionic complexes [Pt{CloH6(NMe2)-8-C, N}{CloH6(NHMe2)-8-C}(X)] (X = Br, CI) with a hydrogen atom bridging between the platinum(tt) centre and the formerly co-ordinating nitrogen (aH NH +15.8 ppm [lJptH 180 Hzl; X-ray structure, X = Br), can be obtained from the reaction of cis-[Pt{CloH6(NMe2)-8-C,N)21 with R2SnX2 (R = Me, Ph; X = Br, CI) in CH2C12-MeOH; in non-protic solvents this reaction gives the isolable P t l V hydride complex [P~{C~OH,(NM~,)-~-C,N}~(H)(X)I ( 6 H PtH -20.35 ppm [ l J p t H 1540 Hz], X = Br).

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Stabilization and reaction behaviour of a terminal phosphido unit on a mononuclear Pt(II) centre. Synthesis and X-ray structure of a cationic diphenylphosphine complex [Pt{C6H3(CH2NMe2)2-2,6}(PHPh2)][OSO2CF3] and a diphenylphosphido-bridged Pt(II)/Pd(II) complex [Pt{C6H3(CH2NMe2)2-2,6}(/~-PPh2)Pd(C6H4CH2NMe2-2)-(HEO)][BF4]-CH2C12 *