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Structural Studies of the Isomorphous MCl2(PMe3)4 (M = Mo, W) Complexes

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Abstract

The structure of WCl2(PMe3)4 has been determined in order to allow for a comparison with its molybdenum analogue. The complexes are isomorphous, and exhibit trans-pseudooctahedral coordination, with crystallographically imposed \(\overline{4}2m\) (D2d) symmetry. A significant distortion occurs involving the PMe3 ligands, through which one opposing pair tilts upward toward one axial chloride ligand, while the other pair tilts in an opposite manner, by 9.33°. The complex crystallizes in the tetragonal space group \(I\overline{4}2m\), with a = b = 9.4987(4) Å, c = 12.1058(5) Å, V = 1092.25(8) Å3, D calc = 1.700 at 150(1) K. For a better comparison, the structure of the molybdenum complex was redetermined, at a low temperature. Its space group is also \(I\overline{4}2m\) with a = b = 9.5193(3) Å, c = 12.1083(5) Å, V = 1097.22 Å3, D calc = 1.426 at 150(1) K. In accord with the larger cell volume, the molybdenum complex possesses slightly longer M–Cl and M–P bonds.

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Acknowledgments

The authors would like to thank the reviewers for helpful comments.

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Authors and Affiliations

  1. Department of Chemistry, University of Utah, 315 South 1400 East, Room 2020, Salt Lake City, UT, 84112-0850, USA

    Benjamin G. Harvey, Adam T. Nickel, Atta M. Arif & Richard D. Ernst

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  1. Benjamin G. Harvey
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  2. Adam T. Nickel
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  3. Atta M. Arif
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  4. Richard D. Ernst
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Correspondence to Richard D. Ernst.

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Harvey, B.G., Nickel, A.T., Arif, A.M. et al. Structural Studies of the Isomorphous MCl2(PMe3)4 (M = Mo, W) Complexes. J Chem Crystallogr 41, 1438–1441 (2011). https://doi.org/10.1007/s10870-011-0117-4

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  • DOI: https://doi.org/10.1007/s10870-011-0117-4

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