¹¹⁹Sn, ³¹P and ¹⁴N NMR and other spectroscopic studies of trichlorostannato complexes of Ru(II) and Ru(III)

Abstract

Chloro- and trichloro-stannato comlexes of ruthenium (II) and ruthenium (III) have been synthesised with bis{2-(diphenylphosphino)ethylamine (DPA) and bis{2-(diphenylphosphino)ethyl}benzyl amine (DPBA) as the primary ligand and PPh₃ or Me₂SO as the secondary ligand. The complexes, characterised by IR Raman, ¹H, ¹⁴N, ³¹p and ¹¹⁹Sn PMR and UV-vis spectroscopy, have a distorted octahedral geometry. The δ Sn values in ruthenium complexes are in the range 118-200 ppm and are much downfield as compared to those in Ir(III)-SnCl₃ complexes. The SnCI<img src='/image/spc_char/3_bar.gif' border=0> group exercises <em>trans</em> effect with respect 10 the <em>trans </em> group (N, Cl, P or S) and <em>cis </em> effect with respect to the groups in the <em>cis </em> position. The ²<em>J</em>(Sn-P) coupling in ruthenium complexes is much smaller than that in Ir(III) and Pt(II) complexes.