Read two articles in Chemical & Engineering News in which Charlie Riordan is quoted.
SCIENCE & TECHNOLOGY
September 17, 2001
Volume 79, Number 38
Some 6,000 papers were presented at the American Chemical Society
national meeting in Chicago late last month. The items below hint at the
broad scope of the presentations.
Nickel thioether complex activates O2
The nickel(I) complex shown (below, top) reacts with molecular oxygen to form a bimetallic complex (bottom) in which the two nickel(III) atoms are bridged by two oxygen atoms derived from O2. Although complexes with such an M2(m-O)2 "diamond core" derived from hydrogen peroxide or via other routes were known for copper, manganese, iron, and nickel, this is the first example of such a nickel complex derived from O2, says Charles G. Riordan, professor of chemistry at the University of Delaware, Newark. Previous reports of such complexes have been limited to those with nitrogen-containing supporting ligands, he tells C&EN. The new complex, prepared by postdoc Beaven S. Mandimutsira, is the first with sulfur-containing ligands. Thioether sulfur atoms are prone to oxidation, Riordan points out, so it is "intriguing" that the thioether ligands in this oxidizing complex manage to resist being oxidized, at least at low temperatures. They may one day prove to be useful supporting ligands for oxidation catalysts, he suggests. Details of the characterization of the dinickel complex have just been published [J. Am. Chem. Soc.,123, 9194 (2001)].