Lawrence Barton
Professor
Barton received his B.Sc. (Hons) from Liverpool University
in
1961 and his Ph.D. in 1964. He joined the faculty at UM-St. Louis
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.
lbarton@jinx.umsl.edu
Office: N302
Phone: (314) 516-5334
Fax: (314) 516-5342
Research
Interests
Our
most recent studies involve 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:
Extensions of this work to bidentate phosphines are currently underway 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 has 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
"Macropolyhedral boron-containing cluster chemistry. A synthetic approach via the auto-fusion of [6,9-(SMe2)2-arachno-B10H12],"J. Bould, U. Dörfler, N. P. Rath, M. Thornton-Pett, L. Barton, W. Clegg, S. J. Teat, M. Thornton-Pett, D. L. Ormsby J. D. Kennedy, Dalton Trans, 2006, 3752.
"Another look at the nido-undecaborate system," O. Volkov, K. Radacki, R. Ll. Thomas, N. P. Rath and L. Barton, J. Organomet. Chem, 2005, 690/11, 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.
"Approaches to encapsulated boron cores. The isolation and characterisation of the partially encapsulated isocloso ten-vertex {RuB9}cluster compound [(PPh3)2RuB9H9]{RuCl2(PPh3)2}2]," Y-H Kim, J. D. Kennedy, L. Barton, and N. P. Rath, Inorg Chem. Commun., 2005, 8, 147.
"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.
"Organometallic Chemistry on Rhodaheteroborane Clusters: Reactions with bidentate phosphines and organotransition metal reagents," O. Volkov, R. Macías, N. P. Rath and L. Barton, Appl. Organomet. Chem., 2003, 17, 409.
"Metal insertion into the open face of an isonido-metallathiaborane cluster: Formation and characterization of [2-PPh3-2,3-Cl2-2,3-(m-Cl)-3,7-(m-dppm)-closo-2,3,1-Rh2SB9H8] from [1-pPh3-{1,3(m-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.
"Derivatization of the Macropolyhedral Cluster [B22H22]22-: Isolation and Characterization of the 5'-OEt- and 4'-OH Derivatives," O. Volkov, N. P. Rath and L. Barton, J. Organomet Chem, 2003, 608, 212.