N-2-(4-methoxyphenyltelluro)ethylbenzamide (L-1) and N-2-(4-methoxyphenyl telluro)propylphthalimide (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
yThe reactions of N-(2-chloroethyl)benzamide and N-3-bromopropylphthalimide with ArTe- Na+ generated in situ by borohydride reduction of Ar2Te2, have resulted in N-2-(4-methoxyphenyltelluro)ethylbenzamide (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. (C) 2002 Elsevier Science Ltd. All rights reserved. References: 34
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