Metalloporphyrins for Quadratic Nonlinear Optics

Sen, Avijit and Ray, Paresh Chandra and Das, Puspendu Kumar and Krishnan, Varadachari (1996) Metalloporphyrins for Quadratic Nonlinear Optics. In: Journal of Physical Chemistry, 100 (50). pp. 19611-19613.

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Abstract

$Cu^{II}$- and $Zn^{II}$-based donor-acceptor porphyrins have been examined for second-order nonlinear optics using the hyper-Rayleigh scattering technique at 1064 nm. Introduction of the metal ions enhances the first hyperpolarizability $(\beta)$ of the free-base donor-acceptor porphyrins significantly. The open shell $Cu^{II} (d^9)$ has a greater influence on $_\beta$ of these porphyrin systems than the closed shell $Zn^{II} (d^{10})$. The high $_\beta$ values in the $Zn^{II}$ porphyrins are understood in terms of the change in dipole moments upon excitation within the context of the two-state model as well as two-photon resonance enhancement. In $Cu^{II}$ porphyrin complexes a large number of excited states seem to contribute to $_\beta$ with, perhaps, a little contribution from two-photon resonance at the excitation wavelength.

Item Type:	Journal Article
Publication:	Journal of Physical Chemistry
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:	04 May 2007
Last Modified:	19 Sep 2010 04:37
URI:	http://eprints.iisc.ac.in/id/eprint/10823

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