N-[2-(4-Methoxyphenyltelluro)ethyl]benzamide ( L1) and N-[2-(4-methoxyphenyl telluro)propyl]phthalimide ( L2): synthesis and ligation with palladium(II), platinum(II) and ruthenium(II). Crystal structures of L1 and L2, the latter as a mixed crystal with L2H 2

Abstract

The reactions of N-(2-chloroethyl)benzamide and N-[3-bromopropyl]phthalimide with ArTe − Na + generated in situ by borohydride reduction of Ar 2Te 2, have resulted in N-[2-(4-methoxyphenyltelluro)ethyl]benzamide ( L 1) and N-[2-(4-methoxyphenyltelluro)propyl] phthalimide ( L 2) respectively. The L 1 and L 2 both exhibit characteristic 1H and 13C NMR spectra. The single crystal structures of L 1 and L 2, the latter as a mixed crystal with L 2H 2 are determined by X-ray diffraction (XRD). The TeC(alkyl) bond length is 2.140(8)/2.149(4) Å and longer than TeC(aryl), 2.107(8)/2.123(5) Å. The complexes having stoichiometries [PdCl 2( L 1)] ( 1), [PtCl 2( L 1)]( 2), [(Phen)Pd( L 1)](ClO 4) 2 ( 3), [(DPPE)Pd( L 1)](ClO 4) 2 ( 4) and [RuCl 2( L 2) 2] ( 5) were synthesized and characterized by elemental analyses, conductance and molecular weight measurements, NMR ( 1H and 13C) and FT-IR spectra. The deshielding of CH 2Te (∼0.2 ppm in 1H NMR and up to 22 ppm in 13C{ 1H} NMR) and NH signals (upto 0.8 ppm in 1H NMR) of 1– 4, with respect to those of free L 1 indicates that L 1 coordinates with Pd–Pt(II) as a (Te, N) ligand. The CH 2Te/CH 2N signals in 1H and 13C NMR spectra of 5 appear deshielded (0.8/0.14 and 20/8 ppm, respectively), when compared with those of free L 2, indicating ligation of L 2 via Te and N.