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Hybrid (Te, N) and (N, Te, N) ligands having pyrrolidine ring and their palladium(II) and mercury(II) complexes: synthesis and crystal structures

Singh, G., Singh, A. K., Sharma, P., Drake, J. E., Hursthouse, M. B. and Light, M. E. (2003) Hybrid (Te, N) and (N, Te, N) ligands having pyrrolidine ring and their palladium(II) and mercury(II) complexes: synthesis and crystal structures Journal of Organometallic Chemistry, 688, (1-2), pp. 20-26. (doi:10.1016/j.jorganchem.2003.08.024).

Record type: Article


Reactions of (2-choroethyl)pyrrolidine hydrochloride with ArTe- or Te2- generated in situ by borohydride reduction of Ar2Te2 or elemental tellurium give N-{2-(4-methoxyphenyltelluro)ethyl}pyrrolidine (L-1) or bis{2-(pyrrolidine-N-yl)ethyl} telluride (L-2), respectively, as viscous liquids, which are characterized by H-1- and C-13 {H-1}-NMR spectroscopy. The potentially bidentate hybrid organotellurium ligand (L-1) reacts with HgBr2 and Na2PdCl4 to give complexes [HgBr2.L-1] (1) and [PdCl2.L-1] (2) respectively. The potentially tridentate ligand (L-2) also forms a complex [HgBr2.L-2] (3). All three complexes give characteristic H-1- and C-13{H-1}-NMR spectra, although the deshielding of carbon atoms linked to Te/N as well as protons attached to them is small in the case of both Hg complexes. The single crystal structures of 1-3 have been solved. In 1 and 2 the ligand L-1 coordinates via Te and N both with metal indicating that the pyrrolidine N has good ligating strength. The Pd-Te and Hg-Te bond lengths are 2.4781(3) and 2.747(1) Angstrom, respectively. The Pd-Cl trans to Te (2.3915(7) Angstrom) is longer than other Pd-Cl bond length. There are two independent molecules in the asymmetric unit of 3 that have essentially the same bidentate molecular structures. There is no evidence of significant intermolecular Hg-Br bonding. The Hg-Te bond in 3 (ave. 2.686(2) Angstrom) is shorter than in 1. The potentially tridentate ligand L 2 in complex 3 coordinates only as a bidentate donor. The molecular weights of 1 and 2 are close to double the formula weight indicating strong molecular association in solution. Te-C(alkyl) is somewhat longer than Te-C(aryl) for complexes 1 and 2.

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Published date: 15 December 2003
Keywords: n-{2-(4-methoxyphenyltelluro)ethyl}pyrrolidine, bis{2-(pyrrolidine-n-yl)ethyl}telluride, mercury, palladium, hybridorganotellurium ligand, complexes, crystal structuren-(2-(4-methoxyphenyltelluro)ethyl)morpholine l-1, chemistry, ruthenium(ii), platinum(ii), ligation, chloride


Local EPrints ID: 20082
ISSN: 0022-328X
PURE UUID: 39026946-693e-4f8a-a4f2-12d91865f116
ORCID for M. E. Light: ORCID iD

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Date deposited: 23 Feb 2006
Last modified: 17 Jul 2017 16:29

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Author: G. Singh
Author: A. K. Singh
Author: P. Sharma
Author: J. E. Drake
Author: M. E. Light ORCID iD

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