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Professor Barton received his B.Sc. (Hons) from Liverpool University in 1961 and his Ph.D. in 1964. He joined the faculty at UMSL in 1966 after spending two years as a research associate at Cornell University. Dr. Barton served as chairman of the Department of Chemistry from 1980 until 1998 and then as the Interim Director of the Center for Molecular Electronics until 2006. Dr. Barton assumed Emeritus status in 2007 and is no longer taking graduate students. |
lbarton@umsl.edu Office: M302 |
Research Interests
Our most recent studies involved the reactions of metallaboranes with Lewis bases. We discovered that the reaction between the metallahexaborane (PPh3)2(CO)OsB5H9 and phosphines results in the formation of a metallapentaborane with a pendent BH2 group to which the added phosphine is attached. The species (PPh3)2(CO)OsB4H7-BH2PR3 degrades thermally to the corresponding osmapentaborane and BH3-PR3. The overall scheme is given below:
This work was extended to bidentate phosphines and such processes as shown in the following scheme are observed.
On the basis of the success seen in the latter study, the reactions of larger metallaboranes with bidentate phosphines provided us with a new area of study. Some of the earlier results are summarized in the scheme below, and they show how one can access range of linked cluster systems.
Selected Publications
"Another look at the nido-undecaborate system," O. Volkov, K. Radacki, R. Ll. Thomas, N. P. Rath and L. Barton, J. Organomet. Chem, 2005, 6100/11, 2736.
"Degradation and Modification of Metallaboranes Part 4: Synthesis and Characterization of a series of hybrid bimetallaborane clusters of the type [2,2,2-(PPh3)2(CO)-nido-2-OsB4H7-3-(BH2PPh2)CxHyPPh2RuCl2(p-cym)]," P. McQuade, R. E. K. Winter, N. P. Rath and L. Barton. Inorg. Chim. Acta, 2005, 358/5, 1545.
"Degradation and Modification of Metallaboranes Part 3, Reactions of the Hexaborane(10) Analogue nido-(PPh3)2(CO)OsB5H9 with Bidentate Phosphines Containing a Rigid Backbone: Formation of Linked Cluster Systems," P. McQuade, R. E. K. Winter and L. Barton. J. Organomet. Chem., 2003, 688, 82.
"Metal insertion into the open face of an isonido-metallathiaborane cluster: Formation and characterization of [2-PPh3-2,3-Cl2-2,3-(μ-Cl)-3,7-(μ-dppm)-closo-2,3,1-Rh2SB9H8] from [1-PPh3-{1,3(μ-dppm)} closo-2,3,1-Rh2SB9H8]." O. Volkov, N. P. Rath and L. Barton, Organometallics, 2003, 22, 2548.
"Reactions of boranes and metallaboranes with phosphines," L. Barton, O. Volkov, M. Hata, P. McQuade and N. P. Rath, Pure Appl. Chem., 2003, 75, 1165.
"Phosphine-boranes as bidentate ligands: Formation of [9,9-η2-{η2-(BH3)dppm}-nido-9,7,8-RhC2B8H11] and [8,8-η2-{η2-(BH3)dppm}-nido-8,7-RhSB9H10] from [8,8-(PPh3)2-nido-8,7-RhSB9H10 and [9,9-(η2-dppm)-9-(η1-dppm)-nido-9,7,8-RhC2B8H11]," O. Volkov, Ramón Macías, N. P. Rath and L. Barton, Inorg. Chem. 2002, 41, 5837