# 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.

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## 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 Copyright of this article belongs to American Chemical Society. Division of Chemical Sciences > Inorganic & Physical Chemistry 01 Jul 2008 19 Sep 2010 04:46 http://eprints.iisc.ernet.in/id/eprint/14725