A supramolecular motif in the solid-state structure of a difunctional thallium(i) amide defined by weak Tl···Tl attractions

Abstract

The crystal structure of the difunctional thallium(I) amide CH₂ [CH₂N(Tl)SiMe₃]₂ 1 reveals a pattern of aggregation based on weak attractive metal–metal interactions, a situation which appears to be influenced by the degree of exposure of the thallium centres; this is evidenced by the solid-state structure of the more shielded analogue CH₂[CH₂N(Tl)SiBu^tMe₂]₂ 2 which features no significant Tl···Tl contacts.

References

1. J.-M. Lehn, Angew. Chem., Int. Ed. Engl., 1988, 27, 89; 1990, 29, 1304; F. Vögtle, Supramolecular Chemistry, Wiley, Chichester, 1991: ed. H.-J. Schneider and H. Dürr, Frontiers in Supramolecular Organic Chemistry and Photochemistry, VCHWeinheim, 1991.
2. See for example: J. A. Zerowski, C. T. Seto and G. M. Whitesides, J. Am. Chem. Soc., 1992, 114, 5473; J.-M. Lehn, M. Mascal, A. DeCian and J. Fischer, J. Chem. Soc., Chem. Commun., 1990, 479; Y.-L. Chang, M.-A. West, F. W. Fowler and J. W. Lauher, J. Am. Chem. Soc., 1993, 115, 5991 and references cited.
3. Unkonventionelle Wechselwirkungen in der Chemie metallischer Elemente, ed. B. Krebs, VCHWeinheim, 1992.
4. Examples: J. S. Casas, A. Castineiras, I. Haiduc, A. Sanchez, J. Sordo and E. M. Vasques-Lopez, Polyhedron, 1994, 13, 1805; H. Pritzkow and P. Jennische, Acta Chem. Scand., Ser. A, 1975, 29, 60; R. Atencio, J. Barbera, C. Cativiela, F. J. Lahoz, J. L. Serrano and M. M. Zurbano, J. Am. Chem. Soc., 1994, 116, 11558; P. Jutzi, D. Wegener and M. B. Hursthouse, Chem. Ber., 1991, 124, 295; P. Jutzi, J. Schnittger and M. B. Hursthouse, Chem. Ber., 1991, 124, 1693; K. W. Klinkhammer and S. Henkel, J. Organomet. Chem., 1994, 480, 167 and references therein.
5. C. Janiak and R. Hoffmann, J. Am. Chem. Soc., 1990, 112, 5924.
6. P. Schwerdtfeger, Inorg. Chem., 1991, 30, 1660 and references therein G. Treboux and J.-C. Barthelat, J. Am. Chem. Soc., 1993, 115, 4870.
7. M. Veith, A. Spaniol, J. Pöhlmann, F. Gross and V. Huch, Chem. Ber., 1993, 126, 2625; K. W. Hellmann, L. H. Gade, A. Steiner, D. Stalke and F. Möller, Angew. Chem., Int. Ed. Engl., 1997, 36, 160.
8. K. W. Hellmann, L. H. Gade, I. J. Scowen and M. McPartlin, Chem. Commun., 1996, 2515.
9. W. B. Pearson, Handbook of Lattice Spacings and Structures of Metals, Pergamon Press, Oxford 1967, vol. 2.
10. Cited in ref. 5 (as personal communication, ref. 132).
11. T. Kottke, R. J. Lagow and D. Stalke, J. Appl. Crystallogr., 1996, 29, 465.
12. G. M. Sheldrick, Acta Crystallogr., Sect. A, 1990, 46, 467.
13. G. M. Sheldrick, SHELXL-96 program for crystal structure refinement, University of Göttingen, 1996.