Chemistry and Biochemistry Alumni SeminarFriday, March 17, 2017 - 4:00pm
Location: Jones Physical Science Center, Room 006
Speaker: Dr. Burjor Captain, Department of Chemistry, University of Miami, Coral Gables, Florida
Topic: Small Molecule Activation by Platinum Complexes Containing Bulky Tin Groups
Abstract: A series of complexes Pt(SnR3)2(CNBut)2, (R = But, Mes, Ph or Pri) were obtained from the reaction of Pt(COD)2 with R3SnH and CNBut. Only the But analog does H2 activation and H2-D2 exchange. This is due to steric reasons imparted by the bulky But groups to distort the geometry of the complex considerably from planarity. The complex [Pt(SnBut 3)(IBut) (μ-H)]2(IBut = N,N’-di-tert-butylimidazol-2-ylidene), which contains two sterically demanding ligands, reacts with CO, C2H4, and H2 to give the corresponding mononuclear Pt complexes Pt(SnBut 3)(IBut)(CO)(H), Pt(SnBut 3)(IBut)(C2H4)(H), and Pt(SnBut 3) (IBut)(H)3, respectively. Ligand modification of the NHC from IBut to IPr [IPr = N,N’-bis-(2,6-(diisopropyl) phenyl)imidazol-2-ylidene)] in the previously reported dimeric complex [Pt(IBut)(SnBut 3)(μ-H)]2 increases steric strain to the point that only the monomeric complex Pt(IPr)(SnBut 3)(H) exists both in solution and the solid state. Complex Pt(IPr)(SnBut 3)(H) is capable of reversible inter- and intra-molecular carbon-hydrogen activation, hydrogen addition, and catalyzing hydrogenation and hydrostannylation reactions. The synthesis and reactivity of these complexes will be discussed.
Sponsored by the College of Arts and Sciences and the Department of Chemistry and Biochemistry
Chemistry and Biochemistry Seminar: March 17, 2017