Md. Khairul Amin, M. Rahman, M. Naher
Oct 1, 2017
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Influential Citations
4
Citations
Journal
Synthetic Metals
Abstract
Abstract A series of acceptor and donor substituted bis(alkoxy)phenyl ethynyl oligomers 4,4′-((2,5-alkyoxy-1,4-phenylene)bis(ethyne-2,1-diyl))bis(nitrobenzene) (alkyl = C4H9 3a; C8H17 3b and C12H25 3c) and 4,4′-((2,5-alkyoxy-1,4-phenylene)bis(ethyne-2,1-diyl))bis(methylbenzene) (alkyl = C4H9 4a; C8H17 4b and C12H25 4c) has been synthesized by the palladium catalyzed cross coupling reaction of 1,4-dialkoxy-2,5-diiodobenzene with appropriate alkynes. The newly synthesized products were characterized by UV–Vis, IR and multinuclear NMR spectroscopic techniques as well as elemental analyses. All the synthesized bis-(alkoxy)phenyl ethynyl derivatives exhibit good thermal stability (T5 = 329–347 °C) as evident by thermo gravimetric analysis. In nitrophenyl substituted 3a-c, emission is observed in the green region, while in tolyl substituted 4a-c, emission is observed in the blue region of the electromagnetic radiation. Continuous wave (CW) closed aperture Z-scan technique reveals the signature of third-order nonlinearity in the materials that are thermal in nature.