Photo-induced relaxation and proton transfer in some hydroxy naphthoic acids in polymers

Article Abstract:

Studies related with photophysical and photochemical properties of 3-hydroxy-2-naphthoic acid [3,2-HNA] and 1-hydroxy-2naphthoic acid [1,2-HNA] in different aprotic, protic, and ion exchange (Nafion) polymers are described. It is observed that, depending on the position of the intramolecular hydrogen bond (IMHB) ring, the electronic spectra get modified and the strength of IMHB is affected by the micro-environment of the polymer, which alters the photophysics of these molecules.

Hydrogen bonding, Hydrogen bonds, Optical properties, Excited state chemistry, Photochemistry, Properties

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Three-dimensional description of the spontaneous onset of homochirality on the surface of a conglomerate crystal phase

Article Abstract:

A discrete three-dimensional model of conglomerate crystallization, based on 1,1'-binaphthyl crystallization experiments, that takes into account the position and environment of every single elementary growth subunit is presented. The model indicates that such a complex phenomena could cause large fluctuation of the final enantiomeric excess that is observed experimentally in binaphthyl crystallization.

Chirality, Crystallization, Chemical properties

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Kinetic model for the chiral symmetry breaking transition in the growth front of a conglomerate crystal phase

Article Abstract:

A model is proposed that basically identifies the conditions under which the chirally autocatalytic surface nucleation can lead to the propagation of a chirally asymmetric solidification front in a supercooled melt. Through linear stability analysis, the critical point at which a symmetric solution becomes unstable and makes a transition to an asymmetric solution is determined.

Chemical reaction, Rate of, Chemical kinetics, Nucleation, Nucleation (Chemistry)

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