Enhancement of Quadratic Nonlinearity via Multiple Hydrogen-Bonded Supramolecular Complex Formation

Bhattacharya, Mily and Samuelson, Ashoka G and Das, Puspendu K (2007) Enhancement of Quadratic Nonlinearity via Multiple Hydrogen-Bonded Supramolecular Complex Formation. In: Journal of Physcial Chemistry B, 111 (25). pp. 7122-7126.

PDF hydrogen-bond.pdf Restricted to Registered users only Download (83kB) | Request a copy

Abstract

The formation and quadratic nonlinearity of a multiple hydrogen-bonded 1:1 supramolecular complex $1^.2$ between the 2,6-diaminopyridine-based \wedge-shaped molecule, 1, and ferrocenyl barbituric acid, 2, in solution have been nvestigated by the hyper-Rayleigh scattering (HRS) and NMR techniques. A 6-fold increase in the molecular hyperpolarizability (\beta) of the complex $1^.2$ over the sum of the molecular hyperpolarizabilities of the components 1 and 2 is seen. Such a significant enhancement in \beta is attributed to the alignment of the molecular dipoles of 1 and 2 in the 2D plane leading to the creation of a large dipole moment in the plane of the supramolecular complex. Depolarized HRS experiments led to the determination of the n-plane polarization components of \beta of the supramolecular complex $1^.2$. The component of \beta in the direction of the dipole moment is large. This investigation exemplifies the role of multiple hydrogen bonds in stabilizing a 2D supramolecular architecture leading to a large enhancement of molecular nonlinearity.

Item Type:	Journal Article
Publication:	Journal of Physcial Chemistry B
Publisher:	American Chemical Society
Additional Information:	Copyright of this article belongs to American Chemical Society.
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	01 Jul 2008
Last Modified:	19 Sep 2010 04:46
URI:	http://eprints.iisc.ac.in/id/eprint/14725

Actions (login required)

View Item