Synthesis of trifunctional ligands containing thiophosphoryl, pyridine and pyridine N-oxide donor groups

Abstract

The trifunctional mixed donor ligands 2,6-[R₂P(S)CH₂]₂C₅H₃N 1 (R = Ph 1a, Tol 1b, n-Bu, 1c) and 2,6-[R₂P(S)CH₂]₂C₅H₃NO 2 (R = Ph 2a, Tol 2b, n-Bu, 2c) have been prepared and characterized by spectroscopic (MS, IR, NMR) techniques. The coordination chemistry of one derivative 1a has been examined and the complex {[Ph₂P(S)CH₂]₂C₅H₃N}Ni(NO₃)₂ has been crystallized and characterized by single-crystal X-ray diffraction methods. The structure contains a six coordinate Ni(II) ion bonded to a tridentate ligand 1a with Ni–N_pyr 2.110(3) Å and Ni–S 2.481(1) and 2.402(1) Å, a bidentate nitrate anion and a monodentate NO₃⁻ anion.