Reactions of Mo–Mo singly-bonded complexes [(η 5-RC 5H 4) 2Mo 2(CO) 6] with diphenylditelluride in the presence of nBu 4NI. Crystal structures of complexes [(η 5-C 5H 5)Mo(CO) 3Te] and cis/ae-[(η 5-C 2H 5O 2CC 5H 4) 2Mo 2(μ-Te) 2 (μ-TePh) 2

Abstract

Reactions of singly-bonded dimolybdenum complexes [(η 5-RC 5H 4) 2Mo 2(CO) 6] ( I, R=CH 3CO; II, R=C 6H 5CO; III, R=CH 3O 2C; IV, R=C 2H 5O 2C) with diphenylditelluride in the presence of n Bu 4NI were investigated. Although complex I reacted with diphenylditelluride in refluxing xylene to give both mononuclear complex 1 [(η 5-C 5H 5)Mo(CO) 3Te] and dinuclear complex 2 cis/ae-[(η 5-CH 3COC 5H 4) 2Mo 2(μ-Te) 2(μ-TePh) 2], reactions of complexes II, III and IV with diphenylditelluride under the same conditions only afforded dinuclear complexes cis/ae-[(η 5-RCC 5H 4) 2Mo 2(μ-Te) 2(μ-TePh) 2] ( 3, R=C 6H 5CO; 4, R=CH 3O 2C; 5, R=C 2H 5O 2C). All the new complexes have been characterized by elemental analyses, 1H NMR, 13C NMR and IR spectroscopies. Crystal structures of complexes 1 and 5 have been determined by X-ray diffraction analyses.