(1)H NMR study of monomeric chloro-rhenium(III) complexes with triarylphosphines and nitriles

Article abstract of DOI:10.1016/0020-1693(95)04657-U

ReCl3(RCN)(PR')2 complexes (R = Me, Et, Ph; R' = Ph, p-tol, m-tol) give relatively narrow (1)H NMR signals in spite of the presence of the paramagnetic Re(III) centre. The signals of one ligands are not greatly affected by changes in the other ligand. In all cases, the spectra are consistent with the mer-trans structure previously found in the solid state for ReCl3 (MeCN)(PPh3)2. For P (m-tol)3, the preparation of the ReOCl3{P(m-tol)3}2 starting complex from ReO4(1-) requiered molder condition than for PPh3 and P(p-tol)3, the standard method leading to the further reduced compound ReCl4{P(m-tol)3}2, whose crystal structure was determinated by x-ray diffraction (monoclinic, P2(1)/c, a = 11.218, b = 18.204, c = 11.192?, β = 118,63°, R = 0.042). The latter complex adopts the trans geometry with the Re atom sitting on a crystalographic inversion centre.