# First hyperpolarizabilities of some push-pull olefins measured by the hyper-Rayleigh scattering technique

Mohanalingam, K and Ray, Paresh Chandra and Das, Puspendu Kumar (1996) First hyperpolarizabilities of some push-pull olefins measured by the hyper-Rayleigh scattering technique. In: Synthetic Metals, 82 (1). pp. 47-51.

 PDF First_hyperpolarizabilities_of.pdf Restricted to Registered users only Download (569Kb) | Request a copy

## Abstract

First hyperpolarizabilities of a series of donor-acceptor substituted ethylenes and butadienes have been measured using the hyper-Rayleigh scattering technique. Keeping the donor group fixed as climethylamino, the second-order nonlinear coefficient $_\beta$ in these aliphatic systems has been measured and is shown to increase as a function of the acceptor strength with the exception of the cyano group. $_\beta$ values of the substituted butadienes are correlated with their bond length alternation parameter $\langle\delta r\rangle$ obtained from semi-empirical calculations. It is shown that even in these small push-pull olefins, it is possible to generate a variety of ground state structures by choosing a suitable acceptor with a fixed donor.

Item Type: Journal Article Copyright of this article belongs to Elsevier. Hyper-Rayleigh scattering;Push-pull olefin;Bond length alternation;First hyperpolarizability Division of Chemical Sciences > Inorganic & Physical Chemistry 17 Jan 2007 19 Sep 2010 04:33 http://eprints.iisc.ernet.in/id/eprint/9313