Isoselenocarbonyl complexes

Abstract

The salt elimination reactions of [NEt4][Mo(CSe)(CO)2(Tp*)] ([NEt4][2], Tp* = hydrotris(3,5-dimethylpyrazol-1-yl)borate) with a range of metal halide complexes (ClMLn) have been investigated as a possible route to isoselenocarbonyl complexes [Mo(CSeMLn)(CO)2(Tp*)].

Advances in Transition Metal Seleno‐ and Tellurocarbonyl Chemistry

“…The simplest examples of these reactions involve treatment of [ 10‐Se ] − with metal halide complexes [MClL n ] such as [RuCl(η 5 ‐C 5 H 5 )(PPh 3 ) 2 ], whereby the selenocarbonylate readily displaces the chloride ligand to provide the molybdenum‐ruthenium isoselenocarbonyl [Mo{≡CSeRu(η 5 ‐C 5 H 5 )(PPh 3 ) 2 }(CO) 2 (Tp*)] ( 33 , Scheme ). Several complexes of ruthenium, 33 , 34 and 36 , and one of iron ( 35 ) were prepared in this manner . In parallel work, the ‘stretched’ isoselenocarbonyl complex [W{≡CC≡CSeRu(η 5 ‐C 5 H 5 )(PPh 3 ) 2 }(CO) 2 (Tp*)] ( 37 ) could be obtained via the fluoride‐mediated ([Bu 4 N]F) protodesilylation of the propargylidyne complex [W(≡CC≡CSiMe 3 )(CO) 2 (Tp*)]( 38 ) in the presence of selenium to provide [Bu 4 N][W(≡CC≡CSe)(CO) 2 (Tp*)] [ 39 ] − which in turn reacts with [RuCl(PPh 3 ) 2 (η‐C 5 H 5 )] via halide metathesis, allowing direct comparison with the shorter isoselenocabonyl complex 33 and the alkynylselenolato complex [Ru(SeC≡CR)(PPh) 2 (η‐C 5 H 5 )] (Scheme ) …”