Bart Kahr

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

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.

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
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.
DOI: 10.1021/ar900288m

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.
DOI: 10.1021/ja1018892

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.

B. Kahr, O. Arteaga
Arago’s best paper
Chemphyschem, 2012, 13, 79-88.

DOI: 10.1002/cphc.201100660

O. Arteaga, J. Freudenthal, B. Wang, B. Kahr
Mueller matrix polarimetry with four photoelastic modulators
Appl. Opt. 2012, 51, 6805-6817.

X. Cui, A. L. Rohl, A. Shtukenberg, B. Kahr
Twisted aspirin crystals
J. Am. Chem. Soc. 2013, 135, 3395–3398.

C. Viedma, J. M. McBride, B. Kahr, P. Cintas
Enantiomer-specific oriented attachment: Formation of macroscopic homochiral crystal
aggregates from a racemic system
Angew. Chem. Int. Ed. Engl. 2013, 52, 10545-10548.

DOI: 10.1002/anie.201303915

A. Shtukenberg, Z. Zhu, M. Bhandari, P. Song, A. Rohl, B. Kahr, M. D. Ward
Illusory spirals and loops and cystine crystal growth
Proc. Natl. Acad. Sci. 2013, 110, 17195-17198.


A. G. Shtukenberg, Yu. O. Punin, A. Gujral, B. Kahr
Growth actuated bending and twisting of crystals
Angew. Chem. Int. Ed. 2014, 53, 672-699.

doi: 10.1002/anie. 201301223

X. Cui, A. Shtukenberg, J. Freudenthal, S. M. Nichols, B. Kahr   
Circular birefringence in banded spherulites
J. Am. Chem. Soc. 2014, 136, 5481–5490.

DOI: 10.1021/ja5013382

O. Arteaga, B. M. Maoz, S. M. Nichols, G. Markovich, B. Kahr
Complete polarimetry on the asymmetric transmission through subwavelength hole arrays
Optics Express, 2014, 22, 13719-13732.


B. Kahr
Gibbs and Amistad
in Culture of Chemistry: The Best Articles on the Human Side of 20th-Century Chemistry     from the Archives of the Chemical Intelligencer
B. Hargittai, I. Hargittai, eds.

Springer, New York 2015; pp 249-256.

V. Murphy, B. Kahr
Hückel theory and optical activity
J. Am. Chem. Soc. 2015, 137, 5177-5183.

DOI: 10.1021/jacs.5b01763

National Science Foundation Young Investigator, 1994; National Science Foundation Special Award for Creativity, 2007 & 2013; R&D 100 Award, 2013.

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