Bis(mercaptoimidazolyl)methane complexes of copper and silver


Tiffany A. Pinder, tpinder@mail.chem.tamu.edu1, Kevin A. Kreisel2, Glenn P. A. Yap2, and Daniel Rabinovich, drabinov@uncc.edu1. (1) Department of Chemistry, The University of North Carolina at Charlotte, 9201 University City Boulevard, Charlotte, NC 28223, (2) Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716
The bis(mercaptoimidazolyl)methanes (BmmR) are sulfur-donor ligands that can be regarded as neutral analogues of the anionic bis(mercaptoimidazolyl)borates [BmR]-. The methyl-substituted derivative BmmMe, introduced by Williams in 1989, was until now the only known member of this family of ligands, with its coordination chemistry limited to a few main group (Pb, Sb, Bi) and transition metal (Re, Rh, Ag) complexes. We describe in this presentation the synthesis and characterization of the first complexes of copper(I) with both BmmMe and the new tert-butyl substituted ligand BmmtBu, including (BmmR)CuX, (BmmR)Cu(PPh3)X, [Cu(BmmR)2]X and dinuclear [Cu2(BmmR)3]X2 derivatives. The (BmmMe)CuX compounds cleanly react with bis(pyrazolyl)borates (BpRR') (R = R' = H or Me) to produce the mixed-donor complexes (BmmMe)Cu(BpRR'). These neutral complexes contain unusual [CuS2N2] cores where both sulfur donor groups are heterocyclic thiones and, as such, are excellent structural models for the copper-binding site in methanobactin, a recently-reported protein present in methane-oxidizing bacteria such as pMMO. In addition, we describe the preparation and characterization of several new silver complexes of these ligands.

General Inorganic Chemistry
9:00 AM-1:00 PM, Sunday, April 6, 2008 Morial Convention Center -- Rm. 219, Oral

Division of Inorganic Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008