191414-86-5Relevant academic research and scientific papers
Ligand structural factors in the establishment of intramolecular Pt ... H hydrogen-bridging interactions in pentafluorophenyl complexes of platinum
Casas, Jose Maria,Fornies, Juan,Martin, Antonio
, p. 1559 - 1563 (2007/10/03)
Anionic complexes with molecular formula [Q][Pt(C6F5)3L] [Q = NBu4+, L = diphenyl-2-pyridylmethane 1,2-benzylpyridine 2,2-(hydroxymethyl)pyridine 3 or 2-hydroxyaniline 4; Q = PPh3Me+, L = 2-isopropyIaniline 5] were prepared by cleavage of the pentafiuorophenyl bridging system in [Q]2[Pt2(u-C6F5)2(C 6F5)4] with L. The analogous complex [NBu4][Pt(C6F3)3(2-Ph 2PC6H4CHO)] 6 was prepared by substitution of the chloride ion by the ligand L in [NBu4]2[Pt(C6F5)3Cl]. The ligands L contain hydrogen atoms which are suitable, from the point of view of both their structure and acidic properties, for establishing hydrogen-bridging interactions with the platinum centre. Proton NMR spectra of some of these complexes show displacement of the signal corresponding to the hydrogen atom towards higher frequencies but no Pt-H coupling. The structure of complex 1 was determined by single crystal X-ray diffraction (Pt ... H distance 2.65 A). The decisive factors for the existence of Pt ... H hydrogen-bridging interactions in solution and in the solid state are discussed.
