Structural characterization of bis(pyrazolyl)hydroborato thallium complexes: Monomeric "two-coordinate" thallium derivatives supplemented by [Tl ⋯ H-B] interactions

Polyhedron

Volumn 16, Issue 19, 1997, Pages 3469-3473

  Dowling, Conor ^a   Ghosh, Prasenjit ^a   Parkin, Gerard ^a  

^a Och Spine at New York Presbyterian Hospitals   (United States)

Author keywords

Coordination number; Pyrazolylborate; Thallium

Indexed keywords

EID: 0000628932     PISSN: 02775387     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0277-5387(97)00120-4     Document Type: Article

References (71)

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30. 4N)} is 4.13 Å.
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55. For a recent discussion of the interactions of C-H and N-H bonds with metal centers, See: Yao, W., Eisenstein, O., Crabtree, R. H., Inorg. Chim. Acta, 1997, 254, 105 and references therein.
56. Huber, K. P., Herzberg, G., Molecular Spectra and Molecular Structure. IV. Constants of Diatomic Molecules, p. 652 Van Nostrand Reinhold, New York (1979).
57. The sum of the covalent radii of Tl (1.55 Å) and H (0.30 Å) is 1.85 Å. See: Pauling, L. The Nature of the Chemical Bond (3rd. Edn.): Cornell University Press, Ithaca (1960).
58. + also commonly experience additional weak interactions with the counteranion. See: (a) Canty, A. J., Mills, K., Skelton, B. W., White, A. H., J. Chem. Soc., Dalton Trans., 1986, 939;
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66. (i) Hughes, D. L., Truter, M. R., Acta Crystallogr., 1983, B39, 329.
67. + moiety listed in the Cambridge Structural Database (Version 5.12, October 1996) is 2.67 Å (with a range of 2.50-2.88 Å).
68. 2 exhibits a Tl ⋯ H separation of 2.6(2) Å. See reference [11].
69. Data taken from Cambridge Structural Database (Version 5.12, October 1996)
70. It must, however, also be recognized that the greater Tl ⋯ B separations for tris(pyrazolyl)hydroborato derivatives may be a consequence of strain introduced by incorporation of a third pyrazolyl group.
71. -1 (reference [14]). In this regard, Trofimenko has also noted that pyrazabole has a complex set of absorptions in both the solid state and solution. See: Trofimenko, S., J. Am. Chem. Soc., 1967, 89, 3165.