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Variable Bonding Modes of Pyrimidine‐2‐thione in Pd II /Pt II Complexes [M(η 2 ‐N, S‐pymS)(η 1 ‐S‐pymS)(PPh 3 )] and [M(η 1 ‐S‐pymS) 2 (L‐L)] (L‐L = dppm, dppe)
Author(s) -
Lobana Tarlok S.,
Kaur Parminderjit,
Hundal Geeta,
Butcher Ray J.,
Castineiras Alfonso
Publication year - 2008
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200700482
Subject(s) - chemistry , phosphine , chelation , medicinal chemistry , nuclear magnetic resonance spectroscopy , stereochemistry , crystallography , catalysis , inorganic chemistry , organic chemistry
Abstract Reactions of pyrimidine‐2‐thione (HpymS) with Pd II /Pt IV salts in the presence of triphenyl phosphine and bis(diphenylphosphino)alkanes, Ph 2 P‐(CH 2 ) m ‐PPh 2 (m = 1, 2) have yielded two types of complexes, viz. a) [M(η 2 ‐N, S‐ pymS)(η 1 ‐S‐ pymS)(PPh 3 )] (M = Pd, 1 ; Pt, 2 ), and (b) [M(η 1 ‐S‐pymS) 2 (L‐L)] {L‐L, M = dppm (m = 1) Pd, 3 ; Pt, 4 ; dppe (m = 2), Pd, 5 ; Pt, 6 }. Complexes have been characterized by elemental analysis (C, H, N), NMR spectroscopy ( 1 H, 13 C, 31 P), and single crystal X‐ray crystallography ( 1 , 2 , 4 , and 5 ). Complexes 1 and 2 have terminal η 1 ‐S and chelating η 2 ‐N, S‐modes of pymS − , while other Pd/Pt complexes have only terminal η 1 ‐S modes. The solution state 31 P NMR spectral data reveal dynamic equilibrium for the complexes 3 , 5 and 6 , whereas the complexes 1 , 2 and 4 are static in solution state.