Reactivity of [WCl(SnCl 3)(CO) 3(NCMe) 2] towards tBuCCH. : X-ray crystal structure of [WCl(CO)( tBuCCH)(NCMe)(PPh 3) 2] 2[SnCl 6

Abstract

In the reaction of [WCl(SnCl 3)(CO) 3(NCMe) 2] with tert-butylacetylene the very labile bis(alkyne) complex [WCl(SnCl 3)(CO)( t BuCCH) 2(NCMe)] has been observed as the major product by means of IR and NMR spectroscopy. The latter compound in reaction with two equivalents of PPh 3 in CH 2Cl 2 solution gives very poorly soluble purple crystals of the tungsten(II) cationic complex. The crystal structure of this compound consists of the discrete [SnCl 6] 2− anion, two independent [WCl(CO)( t BuCCH)(NCMe)(PPh 3) 2] + cations and four MeCN (solvent) molecules. This is the first crystallographically characterized cationic chlorocarbonyl complex of tungsten(II) containing a terminal alkyne as ligand.