Title: A comparison of the solid-state structures of four crystallographically independent molecules of bis(pentamethylcyclopentadienyl)dioxodimolybdenum(VI) oxide, [Cp*MoO2]2O
Abstract: Two previously undisclosed polymorphs of [Cp*MoO2]2O have been crystallographically characterized: 1: monoclinic, P21/n, a 8.145(4), b 9.193(3), c 15.263(5) Å, β 93.61 (3)°, V 1140.9(8) Å3, Z = 2, R(F) = 4.78%; II, monoclinic, P21/n, a 9.434(3), b 16.872(5), c 14.157(4) Å, β 97.19 (2)°, V 2235.7 (12) Å3, Z = 4, R(F = 4.39%. A third polymorph (III, Z = 6) has recently been reported in two independent accounts [J.W. Faller and Y. Ma, J. Organomet. Chem., 340 (1980) 59; P. Leoni, M. Pasquali, L. Salsini, C. di Burgno. D. Braga and P. Sabatino, J. Chem. Soc., Dalton Trans., (1989) 155]. The existence of three polymorphs with four independent molecules containing six crystallographically independent, but chemically identical, Cp*Mo groups creates an unusual opportunity to examine the ranges of intramolecular bond parameters. Such knowledge is essential to a discussion of the extent to which intermolecular (crystal packing) factors affect these parameters. The MgOMo angle is found to vary from strict linearity (in 1 and II) to 172.7(3)° (in II). The range of terminal MoO distances exceeds the entire ranges seen in all previously known Mo(VI) structures containing MoO bonds.
Publication Year: 1991
Publication Date: 1991-02-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 25
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