N- 2-(4-methoxyphenyltelluro)ethyl benzamide (L-1) and N- 2-(4-methoxyphenyl telluro)propyl phthalimide (L-2): synthesis and ligation with palladium(II), platinum(II) and ruthenium(II). Crystal structures of L-1 and L-2, the latter as a mixed crystal with (LH2)-H-2

Singh, A. K., Sooriyakumar, J., Kadarkaraisamy, M., Drake, J. E., Hursthouse, M. B., Light, M. E. and Butcher, R. J. (2002) N- 2-(4-methoxyphenyltelluro)ethyl benzamide (L-1) and N- 2-(4-methoxyphenyl telluro)propyl phthalimide (L-2): synthesis and ligation with palladium(II), platinum(II) and ruthenium(II). Crystal structures of L-1 and L-2, the latter as a mixed crystal with (LH2)-H-2. Polyhedron, 21 (5-6), 667-674. (doi:10.1016/S0277-5387(02)00831-8).

Abstract

yThe reactions of N-(2-chloroethyl)benzamide and N-[3-bromopropyl]phthalimide with ArTe- Na+ generated in situ by borohydride reduction of Ar2Te2, 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 H-1 and C-13 NMR spectra. The single crystal structures of L-1 and L-2, the latter as a mixed crystal with (LH2)-H-2 are determined by X-ray diffraction (XRD). The Te-C(alkyl) bond length is 2.140(8)/2.149(4) Angstrom and longer than Te-C(aryl), 2.107(8)/2.123(5) Angstrom. The complexes having stoichiometries [PdCl2(L-1)] (1), [PtCl2(L-1)](2), [(Phen)Pd(L-1)](ClO4)(2) (3), [(DPPE)Pd(L-1)](ClO4), (4) and [RuCl2(L-2)(2)] (5) were synthesized and characterized by elemental analyses, conductance and molecular weight measurements, NMR (H-1 and C-13) and FT-IR spectra. The deshielding of CH2Te ( similar to 0.2 ppm in H-1 NMR and up to 22 ppm in C-13{H-1} NMR) and NH signals (upto 0.8 ppm in H-1 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 CH2Te/CH2N signals in H-1 and C-13 NNIR spectra of 5 appear deshielded (0.8/0.14 and 20/8 ppm, respectively), when compared with those of free L2, indicating ligation of L-2 via Te and N.

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Contributors

Author: M. E. Light

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