Synthesis and characterization of cationic heteronuclear complexes of platinum(II) and silver( I) bridged by alkynyl ligands

• Published in: Journal of organometallic chemistry 1996-03, Vol.510 (1), p.63-70
• Main Authors: Ara, I., Berenguer, J.R., Forniés, J., Lalinde, E., Moreno, M.T.
• Format: Article
• Language: English
• Subjects: Alkynyl; Pentafluorophenyl; Platinum; X-ray diffraction
• ISSN: 0022-328X; 1872-8561
• DOI: 10.1016/0022-328X(95)05832-A

The dialkynyl complexes cis-[Pt(C  CR) 2L 2] [R  Ph, L 2  2PPh 3, 2PEt 3, dppe (dppe  1,2-bis(diphenylphosphino)ethane]; R  tBu, L 2  2PPh 3, dppe) react with silver perchlorate in a molar ratio 1:0.5 to give platinum-silver perchlorate salts of the type [Pt 2 Ag(C  CR) 4L 4](ClO 4) in excellent yield. The X-ray crystal structure of [Pt 2Ag(C  CPh) 4(PPh 3) 4](ClO 4) 1 shows that the cation is formed by two nearly orthogonal cis-[Pt(C  CPh) 2(PPh 3) 2] units connected through a silver cation which is unsymmetrically π-bonded to all four acetylene fragments. Similar reactions of cis-[Pt(C  CR) 2L 2] with one equivalent of AgClO 4 afford cationic complexes of general formula [PtAg(C  CR) 2L 2](ClO 4), which are believed to be salts, [Pt 2Ag 2(C  CR) 4L 4](ClO 4) 2.