Bart Kahr

Professor of Chemistry; Director of Undergraduate Studies
A.B., Middlebury College Ph.D., Princeton University, Postdoctoral Associate, Yale University

Email:
Phone: 212-992-9579
Office: Brown Building, 29 Washington Place, Room 656
Lab Homepage

Areas of Research/Interest
Chemical crystallography, interations of light and organized media, polycrystalline pattern formation, origin of life science, experimental history of science.

Research Description
Crystalline polyhedra are prototypical material objects; light is ethereal. Yet, there has been a surprising reciprocity between crystals and light. Polarization and photon entanglement are crystal-optical discoveries while light scattering has been unsurpassed in the characterization of crystals. We engage this dialogue through investigations of unusual crystalline materials that have informed crystal growth mechanisms and led to the design of new optical materials. Recently, we have focused on the interactions of light with organized polycrystals that occur in biopathological structures, high-polymers, molecular crystals, and simple salts; pattern formation is one of the great organizing principles common to all of the sciences. We develop polarization imaging methodologies for the study of complex aggregates and are especially interested in defining heterogeneities and anisotropies of chiroptical properties.

Publications
T Bullard, KL Wustholz, E Bott, M Robertson, PJ. Reid, B Kahr
Role of kinks in dyeing crystals: Confocal luminescence microscopy from single molecules to square centimeters
Cryst. Growth Des. 2009, 9, 982-990

Y Bing, W Kaminsky, B Kahr, D Viterbo
Turinese stereochemistry: Eligio Perucca’s enantioselectivity and Primo Levi’s asymmetry
Angew. Chem. Int. Ed. Engl. 2009, 48, 2-8.

B Kahr, J. Freudenthal, S Philips, W Kaminsky
Herapathite
Science, 2009, 324, 1407
See also: J Kemsley, Chem. & Eng News, 22 June 2009, pp 43; P Ball, Nature Materials, 2009, 8, 774.

B. Kahr, J. Freudenthal, E. Gunn
Crystals in light
Acc. Chem. Res. 2010, 43, 684-692.

A. G. Shtukenberg, J. Freudenthal, B. Kahr
Reversible twisting during helical hippuric acid crystal growth
J. Am. Chem. Soc. 2010, 132, 9341-9349.

Y. Bing, D. Selassie, R. H. Paradise, C. Isborn, N. Kramer, M. Sadilek, W. Kaminsky, B. Kahr
Circular dichroism tensor of a triarylmethyl propeller in sodium chlorate crystals
J. Am. Chem. Soc. 2010, 132, 7454-7465.

B. Kahr
Et tu crystallographer: Murder charges against close-packing pioneers evaluated
Cryst. Growth Des. 2011, 11, 4-11.

A. Shtukenberg, E. Gunn, M. Gazzano, J. Freudenthal, E. Camp, R. Sours, E. Rosseeva, B. Kahr
Bernauer’s bands
ChemPhysChem, 2011, 12, 1558-1571.

B. Kahr, A. Shtukenberg, E. Gunn, D. L. Carter, A. L. Rohl,
Controlling mesoscale chirality with additives, again
Cryst. Growth Des. 2011, 11, 2070-2073.

V. L. Murphy, B. Kahr
Planar hydrocarbons more optically active than their isomeric helicenes,
J. Am. Chem. Soc. 2011, 113, 2918–12921.

H.-M. Ye, J. Xu, J. Freudenthal, B. Kahr
On the circular birefringence of polycrystalline polymers: polylactide
J. Am. Chem. Soc. 2011, 133, 13848–13851.
DOI: 10.1021/ja205159u

B. Kahr, O. Arteaga
Arago’s best paper
Chemphyschem, 2011, 0000.

Fellowships/Honors
National Science Foundation Young Investigator, 1994; National Science Foundation Special Award for Creativity, 2007.

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