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 ...