Pentamethylmolybdenum

Pentamethylmolybdenum

Identifiers
CAS Number	287715-39-3
3D model (JSmol)	Interactive image
ChemSpider	63001354
PubChem CID	15520647
InChI InChI=1S/5CH3.Mo/h5*1H3;/q5*-1;+5 Key: ILRMVGULUOSRQX-UHFFFAOYSA-N
SMILES C[Mo](C)(C)(C)C
Properties
Chemical formula	C5H15Mo
Molar mass	171.13 g·mol−1
Appearance	turquoise blue crystals
Boiling point	decomposes at −10°C
Structure [1]
Crystal structure	tetragonal
Space group	I4
Lattice constant	a = 7.680, b = 7.680, c = 6.490
Lattice volume (V)	382.80
Formula units (Z)	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

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]

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 4d_z² and one third 4d_x²−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]

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.