94138-23-5Relevant academic research and scientific papers
Addition of Di-p-tolylcarbodiimide to ditungsten hexa-tert-butoxide. Preparation and structure of [W(OCMe3)3]2(μ-C7H 7NCNC7H7)
Cotton, F. Albert,Schwotzer, Willi,Shamshoum, Edwar S.
, p. 461 - 465 (2008/10/08)
Ditungsten hexa-tert-butoxide reacts readily with di-p-tolylcarbodiimide, CH3C6H4NCNC6H4CH 3, in toluene at 25°C to afford in about 80% yield the moderately air-sensitive red-black adduct [W-(OCMe3)3]2(M-C7H 7NCNC7H7). This product has been identified and characterized by NMR and X-ray crystallography. The molecule has the carbodiimide group bridging the W-W bond (2.482 (1) A?) and three OCMe3 groups on each W atom, with effective symmetry C2. The 13C NMR indicates that in solution the molecule is either actually or effectively more symmetrical since the OCMe3 groups form only two sets in 4:2 ratio. The crystalline compound belongs to space group Pbca with unit-cell dimensions a = 18.693 (4) A?, b = 17.739 (7) A?, c = 26.685 (8) A?, V = 8849 (3) A?3, and Z = 8. The structure was refined to R = 0.045 and Rw = 0.058. The bonding of the carbodiimide molecule to the W-W unit is discussed, and a simple formulation that leaves a W-W double bond is proposed.
