Pentamethylmolybdenum

Pentamethylmolybdenum is an organomolybdenum compound containing five methyl groups bound to a central molybdenum atom.[2] The shape of the molecule is a square pyramid.[3]

Pentamethylmolybdenum
Identifiers
3D model (JSmol)
ChemSpider
Properties
C5H15Mo
Molar mass 171.13 g·mol−1
Appearance turquoise blue crystals
Boiling point decomposes at −10°C
Structure[1]
tetragonal
I4
a = 7.680, b = 7.680, c = 6.490
382.80
2
Related compounds
Related compounds
 Pentamethylarsenic
Pentamethylbismuth
Pentamethylantimony
pentamethyltantalum
Hexamethylmolybdenum
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

The molecule is similar to pentamethyltungsten in shape and properties.[3]

Production

Pentamethylmolybdenum can be prepared from molybdenum pentachloride and dimethyl zinc at low temperature between −70 and −20. Another possible creation route, is from molybdenum oxychloride.[2] Pentamethylmolybdenum is paramagnetic with one unpaired electron. The character of this electron is two thirds 4dz2 and one third 4dx2−y2.[2]

Properties

Pentamethylmolybdenum is unstable and sensitive to oxygen. It turns black when exposed to air, or heated over −10°C.[2] The Raman spectrum has bands at 1181, 960, 90, 882, 783, 672, 620, 565, 523, 507, 451, 366, 308, 267 and 167  cm−1.[2]

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References
  1. Vreshch V. (2018). "Crystal Structure of Pentamethylmolybdenum(V)". crystallography-online.com.
  2. Roessler, Beatrice; Kleinhenz, Sven; Seppelt, Konrad (2000). "Pentamethylmolybdenum". Chemical Communications (12): 1039–1040. doi:10.1039/b000987n.
  3. Werner, Helmut (2008). Landmarks in Organo-Transition Metal Chemistry: A Personal View. Springer Science & Business Media. p. 309. ISBN 9780387098487.
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