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Nonlinear optical properties of linear chain phosphazenes, (PN)x

Jha, Prakash Chandra and Krishnan, Anu and Das, Puspendu K and Ramasesha, S (2002) Nonlinear optical properties of linear chain phosphazenes, (PN)x. In: Journal of Chemical Physics, 117 (6). pp. 2873-2881.

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Abstract

The correlated Pariser–Parr–Pople model Hamiltonian for interacting \pi-electrons is employed for calculating frequency dependent linear polarizability as well as first and second hyperpolarizabilities of linear chain phosphazenes (–P=N–)x (x=3–6). The model parameters for phosphorus and nitrogen are obtained by comparing the theoretical excitation energies with experimental spectra of the known phosphazene systems. The optical gap of the phosphazene oligomers extrapolates to 3.7 eV compared to 2.8 eV of their organic analogs, namely, the polyenes. The linear polarizability of the phosphazene systems are comparable to those of the polyenes. However, the third harmonic generation coefficients are smaller at the same excitation energies. The power law exponent for the third harmonic generation coefficient in phosphazenes is also much smaller than that in polyenes. The second harmonic generation coefficients of the phosphazenes are smaller than those of the push–pull polyenes. Introduction of terminal push–pull groups on phosphazenes does not significantly improve the second harmonic generation response of these systems.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to American Institute of Physics (AIP).
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 23 Dec 2004
Last Modified: 19 Sep 2010 04:17
URI: http://eprints.iisc.ernet.in/id/eprint/2497

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