Reactions of Mo?Mo singly-bonded complexes 6($eta;5-RC5H4)2Mo2(CO)69 with diphenylditelluride in the presence of nBu4NI. Crystal structures of complexes 6($eta;5-C5H5)Mo(CO)3Te9 and cis/ae-6($eta;5-C2H5O2CC5H4)2Mo2($mu;-Te)2 ($mu;-TePh)29*1

Abstract

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