Larry K. Krannich

Professor Emeritus

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205-934-8017krannich

Professor Emeritus, obtained his B.S. degree in mathematics at Illinois State Normal University (1963) and his M.S. degree in chemistry at Illinois State University (1965). He then pursued a Ph.D. degree in main group Inorganic Chemistry at the University of Florida, (1968). Since 1969, Dr. Krannich has been a faculty member at UAB. He enjoys outdoor activities, including hiking, fishing, and biking.

Our research has been directed toward a fundamental understanding of the reactivity of organo-alanes, gallanes, and indanes with organo-phosphines, arsines, stibines, and bismuthines to use this information to develop synthetic strategies to the heavier Group 13/15 bonded compounds. We approach this research through a combination of our expertise in NMR spectroscopy and main group synthesis. This has led to the:
(a) successful application of variable temperature multinuclear NMR to elucidate reaction pathways in borane(or trialkylaluminum or trialkylgallium)/aminoarsine (or aminophosphine or aminostibine) reaction systems;
(b) NMR spectral characterization of 13/15 compounds; and
(c) use of the solution NMR studies to fashion novel synthetic pathways to arsines and As-B, As- Al, As-Ga, Al-N, and Ga-N species.

We have applied this approach to deduce the reaction pathways that occur in the reactions of Me2AlH with aminoarsines and aminophosphines. The results have led to new synthetic routes to As-H, P- H, As-As, P-P, Al-As, Al-P, and Al-N bond containing species. Of particular interest is the development of a novel methodology for the synthesis of phosphino- and arsinoalane ring compounds and the possible extension of this to the unknown stibino- and bismuthinoalanes. We have shown that Me2AlH readily attacks the [Me2AlNMe2]2 to form species such as Me2AlNMe2 HAlMe2 and [Me2AlNMe2-HAlMe2]2. Our latest thrust has elucidated the pathway to the formation of orthometallated Al-N and Ga-N dimers in the thermolysis of secondary amine adducts of Me3Al, Me3Ga, and Me3In.

 

 

Simultaneously, there has been a continued dedication to provide outreach and in-service programs to science teachers in Alabama to enhance the quality of science education in the State. The focus has always been on novel laboratory-based activities for direct implementation into the school classroom or laboratory.

Through the NSF GK-12 program and collaborations involving the Schools of Education, Medicine, and Natural Sciences and Mathematics, we have developed a model outreach program that provides fellowships and training to enable graduate and advanced undergraduate science students to serve as resources in K-12 science education in the Birmingham metropolitan area. This was built on the existing science outreach infrastructure involving UAB and the local school systems. Fellows receive an overview of learning theory and pedagogy, as advocated by the National Science Education Standards, and are then trained in the specific outreach program to which they are assigned. Science equipment, materials, and curricula are delivered to K-12 students and teachers receive professional development. NSF fellows provide expertise in science content while being incorporated into the teaching, curriculum development, hands-on science instruction, and mentoring activities with K-12 teachers and students in the local school systems. In a synergistic way while mentoring Fellows in K-12 classrooms and labs, K-12 teachers transfer to the Fellows experiential knowledge of how people learn and the application of appropriate pedagogical techniques to facilitate learning. This program is funded through 2005, www.gk12.uab.edu.

Publications

Reactivity of triethylaluminum with a series of secondary amines. Adduct and aminoalane dimer synthesis and characterization; the crystal structures of [Et2AlN(c-C6H11)2]2 and [Et2AlNC4H8NCH3]2," Styron, E. K., Lake, C. H., Schauer, S. J., Watkins, C. L., Krannich, L. K., Polyhedron, 18:1599-1606 (1999).

"Reactivity studies of trimethylaluminum, trimethylgallium, and trimethylindium with a series of five silylamines: molecular structure of trans-[Me2InN(Me)SiMe3]2," Styron, E. K., Schauer, S. J., Lake, C. H., Watkins, C. L., Krannich, L. K., Journal of Organometallic Chemistry, 585:266-274, (1999).

"Synthesis, NMR Characterization, and Molecular Structural Studies of a Series of Orthometalated Aluminum-Nitrogen Dimers." Styron, E. K., Lake, C. H., Watkins, C. L., Krannich, L. K., Incarvito, C. D., Rheingold, A. L. Organometallics, 19:3253-3256, (2000).

"Synthesis and Molecular Structural Stuides of a Series of Orthometalated Dimers [RAlN(t-Bu)-µ-(CH2C6H4)]2 where R = Me, Et, n-Pr, n-Bu, i-Bu." Kekia, O. M., Watkins, C. L., Krannich, L. K., Rheingold, A. L., Liable-Sands, L. Organometallics, 20:582, (2001).

"Reactivity of Me3M, (M= Al, Ga, In) with Benzylamine to Form the Dimers, [Me2MN(H)CH2Ph]2 and Hexamers, [MeAlNCH2Ph]6 and [MeGaNCH2Ph]6. Molecular Structures of trans-[Me2MN(H)CH2Ph]2 and [MeAlNCH2PH]6." Styron, E. K., Lake, C. H., Powell, D. H., Krannich, L. K., Watkins, C. L. Journal of Organometallic Chemistry, 649:78-85, (2002).

"A Comparison of the NMR, Mass Spectral, and Molecular Structure Data for [R2AlN(CH2Ph)2]2, where R = Me, Et, Prn, Bun, and Bui." Styron, E. K., Lake, C. H. Powell, D. H., Watkins, C. L., Krannich, L. K. Polyhedron, 18: 1747-1753, (2002).

"Synthesis and Molecular Structure Studies of [Me2AlN(i-Pr)CH2Ph]2 and the Related Orthometalated Dimers, [RAlN(i-Pr)-µ-(CH2C6H4)]2, where R = Me, n-Pr, n-Bu, i-Bu." Omar M. Kekia, O. M., Krannich, L. K., Watkins, C. L., Incarvito, C. D., Rheingold, A. L. Organometallics, 21: 5987-5990, (2002).