New soft scorpionate complexes of vanadium

CHED 1197

Kevin J. Robbins, krobbins2@ksc.mailcruiser.com and Colin D. Abernethy. Department of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435-2001

Scopionates are an important class of tridentate ligands that have been used to form a wide array of complexes containing both transition metals and main group elements.  Trismethimazolylborate, Tm, (1) and its substituted derivative (2) are soft scorpionate ligands, which bind to metal centers via their three sulfur atoms.  To date, most of the reported complexes of Tm have featured soft Lewis acid centers such as late transition metals and low-valent main group elements.  We are interested in exploring the coordination chemistry of these soft scorpionates towards early transition metals; the combination of soft ligands and hard metal centers will give rise to complexes with new structures and reactivity.  Accordingly, we have prepared complexes of 1 and 2 with vanadium centers in a variety of different oxidation states.  The physical and chemical properties of these complexes will be described.