Pentafluorophenyl Complexes of Platinum Containing Intramolecular Pt⋯H Hydrogen Bridging Interactions. Crystal Structures of [NBu4][Pt(C6F5) 3(8-hydroxyquinaldine)] and [NBu4][Pt(C6F5)3(8-methylquinoline)]

J. M. Casas, Larry R. Falvello, Juan Forniés, Antonio Martín, Alan J. Welch

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Abstract

Anionic complexes with the molecular formula [NBu4][Pt(C6F5)L] (L = 8-hydroxyquinoline, C9H7NO, (1); 8-hydroxyquinaldine, C10H10NO, (2); 7,8-benzo[h]quinoline, C13H9N, (3); 8-methylquinoline, C10H9N (4)) were prepared by cleavage of the pentafluorophenyl bridging system in [NBu4]2[Pt2(µ-C6F 5)2(C6F5)4] with L (1-4) or by substitution of the chloride ion by the ligand L in [NBu4]2[Pt(C6F5)3L] (1 and 4). 1H NMR spectra of 1-3 show the presence of a Pt?H interaction in solution with J(Pt,H) of 69 (1), 88 (2), and 22 Hz (3). For 4, no Pt-H coupling is observed. Structures of complexes 2 and 4 were determined by single crystal X-ray diffraction. For 2 a Pt-H distance of 2.19 Å was determined, whereas for 4 the methyl hydrogen atoms were not located and a Pt-H distance in the range of 2.3-2.6 Å was calculated geometrically. Compound 2 (C44H45F15OPt) crystallizes in the monoclinic system, space group P21/c: a = 18.376(6) Å, b = 11.786(4) Å, c = 20.473(7) Å, ß= 102.88- (6)°, V = 4322(3) Å3, Z = 4. Compound 4 (C44H45F15N2Pt) crystallizes in the triclinic system, space group P1¯ a = 12.125(2) Å, b = 13.152(2) Å, c = 14.795(7) Å, a = 88.20(3)°, ß= 68.15(3)°, ? = 86.37(1)°, V= 2185.2- (5) Å3, Z = 2. The existence and nature of the Pt?H interactions both in solution and in the solid state are discussed.

Original languageEnglish
Pages (from-to)6009-6014
Number of pages6
JournalInorganic Chemistry
Volume35
Issue number21
Publication statusPublished - 1996

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