Title:	Synthesis and characterization of a new NLO-active donor–acceptor-type conjugated polymer derived from 3,4-diphenylthiophene
Authors:	Manjunatha, M.G. Adhikari, A.V. Hegde, Pramod Kumar Suchand Sandeep, C.S. Philip, Reji
Keywords:	Donor–acceptor conjugated polymers 3,4-Diphenylthiophene 1,3,4-Oxadiazole Electrochemical properties NLO - 3PA
Issue Date:	Jul-2010
Publisher:	Springer
Citation:	Journal of Polymer Research, 2010, Vol.17, p495
Abstract:	A new donor–acceptor-type conjugated polymer (P1) carrying 3,4-diphenylthiophene, 2,5-dihexyloxybenzene, and 1,3,4-oxadiazole units was synthesized through multistep reactions. The polymer was prepared using a polyhydrazide precursor route. The polymer has a well-defined structure and exhibits good thermal stability, with a decomposition onset temperature in nitrogen of 300 °C. Cyclic voltammetry experiments revealed that the polymer has low-lying LUMO (−3.68 eV) and high-lying HOMO (−5.78 eV) energy levels. The electrochemical band gap was found to be 2.10 eV. The UV-visible absorption spectrum of the polymer presented a maximum at 373 nm, and it displayed bluish-green fluorescence in dilute chloroform solution. The nonlinear optical properties of the new polymer were investigated at 532 nm using the Z-scan technique with nanosecond laser pulses. The polymer exhibited strong optical limiting behavior due to excited state absorption, which was phenomenologically similar to a three-photon absorption (3PA) process. The 3PA coefficient γ was found to be 7 × 10−22 m3/W2. The studies show that the new polymer (P1) is a promising material for developing efficient photonic devices.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/3977
ISSN:	1572-8935-(online) 1022-9760
Alternative Location:	http://dx.doi.org/10.1007/s10965-009-9336-1
Copyright:	2010 Springer
Appears in Collections:	Research Papers (LAMP)

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