Synthesis and reactivity of hydroxo-bridged binuclear platinum complexes. Crystal structure of [NBu4]2[{Pt(C6F5)2(µ-OH)}2]
- 1 January 1992
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 1,p. 53-58
- https://doi.org/10.1039/dt9920000053
Abstract
The reaction of [NBu4]2[{Pt(C6X5)2(µ-Cl)}2] with NBu4OH(aq) in acetone leads to the formation of the hydroxo-complexes [NBu4]2[{Pt(C6X5)2(µ-OH)}2](X = F 1 or Cl 2). These react with weak protic acids such as acetylacetone (Hacac), benzoylacetone (Hbzac) and 8-hydroxyquinoline (Hquin) yielding the mononuclear complexes [NBu4][Pt(C6X5)2(L–L)](X = F, L–L = acac 3, bzac 4, or quin 5; X = Cl, L–L = acac 6, bzac 7, or quin 8). Treatment of complexes 1 and 2 with PhCN in the presence of HBF4 gives the mononuclear compounds cis-[Pt(C6X5)2(PhCN)2](X = F 9 or Cl 10). When the benzonitrile complexes are treated with aniline the corresponding cis-[Pt(C6X5)(NH2Ph)2](X = F 11 or Cl 12) are formed. The benzamido derivatives [NBu4][Pt(C6X5)2(HNOCPh)(H2O)](X = F 13 or Cl 14) are formed when complexes 9 and 10 are treated with NBu4OH(aq) in acetone, and thermal treatment of 13 yields [NBu4]2[{Pt(C6F5)2(µ-HNOCPh)}2]15. Complexes 9 and 10 react with methanol in the presence of NBu4OH to give the corresponding imido ester derivatives [Pt(C6X5)2{HNC(OMe)Ph}2](X = F 16 or Cl 17). Spectroscopic (IR, 1H and 19F) data have been used for structural assignments, and an X-ray structure determination carried out for [NBu4]2[{Pt(C6F5)2(µ-OH)}2] has established the centrosymmetric binuclear nature of the anion [(C6F5)2Pt(µ-OH)2Pt(C6F5)2]2–. The structure has been solved and refined up to R= 0.049 and R′= 0.056 based on 2278 observed reflections. The Pt atoms are four-co-ordinated and show slight deviations from a square-planar arrangement.Keywords
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