TY - JOUR
T1 - Synthesis and optical properties of biphenylene ethynylene co-polymers and their model compounds
AU - Nag, Okhil K.
AU - Anis-Ul-Haque, Kazi M.
AU - Debnath, Dipen
AU - Begum, Rockshana
AU - Younus, Muhammad
AU - Chawdhury, Nazia
AU - Kociok-Köhn, Gabriele
AU - Raithby, Paul R.
PY - 2015/3/1
Y1 - 2015/3/1
N2 - A new series of biphenylene ethynylene co-polymers, poly(2,5-dialkoxy-4-phenyleneethynylene-4,4-biphenyleneethynylene)s of the general formula [-C ≡C-4-C6H4-C6H4-4-C ≡C-C6H2(2,5-OR)2-]n (R = C4H9 P1, C8H17 P2) has been synthesized using a palladium/copper catalyzed coupling reaction between HC ≡C-4-C6H4-C6H4-4-C ≡C-H and IC6H2(2,5-OR)2I. The new co-polymer [-C ≡C-C6H2(2,5-OC8H17)2-C ≡C-C6H2(2,5-OC4H9)2-]n P5 has also been formed where different alkoxy substituents are present on alternate arene rings in the same polymer backbone. All the polymers were characterized by IR, 1H and 13C NMR spectroscopy and by GPC. The model compounds C6H5-4-C6H4-C≡C-C6H2(2,5-OR)2-4-C6H4-C6H5 (R = C4H9 M1, C8H17 M2) have also been prepared by the reaction between C6H5-4-C6H4-C≡CH and IC6H2(2,5-OR)2I. Single crystal X-ray structures of M1, M2 and Me3Si-C≡C-4-C6H4-C6H4-4-C≡C-SiMe3 were determined with a view to obtain a better understanding of the molecular and intermolecular interactions in the solid state which has been used to explain the optical properties of the polymers derived from them. The absorption and photoluminescence spectra of the polymers, P1, P2 and P5 showed that the lowest energy band is blue shifted due to the introduction of biphenylene fragments into the alkoxy substituted poly(ethynylenephenylene)s.
AB - A new series of biphenylene ethynylene co-polymers, poly(2,5-dialkoxy-4-phenyleneethynylene-4,4-biphenyleneethynylene)s of the general formula [-C ≡C-4-C6H4-C6H4-4-C ≡C-C6H2(2,5-OR)2-]n (R = C4H9 P1, C8H17 P2) has been synthesized using a palladium/copper catalyzed coupling reaction between HC ≡C-4-C6H4-C6H4-4-C ≡C-H and IC6H2(2,5-OR)2I. The new co-polymer [-C ≡C-C6H2(2,5-OC8H17)2-C ≡C-C6H2(2,5-OC4H9)2-]n P5 has also been formed where different alkoxy substituents are present on alternate arene rings in the same polymer backbone. All the polymers were characterized by IR, 1H and 13C NMR spectroscopy and by GPC. The model compounds C6H5-4-C6H4-C≡C-C6H2(2,5-OR)2-4-C6H4-C6H5 (R = C4H9 M1, C8H17 M2) have also been prepared by the reaction between C6H5-4-C6H4-C≡CH and IC6H2(2,5-OR)2I. Single crystal X-ray structures of M1, M2 and Me3Si-C≡C-4-C6H4-C6H4-4-C≡C-SiMe3 were determined with a view to obtain a better understanding of the molecular and intermolecular interactions in the solid state which has been used to explain the optical properties of the polymers derived from them. The absorption and photoluminescence spectra of the polymers, P1, P2 and P5 showed that the lowest energy band is blue shifted due to the introduction of biphenylene fragments into the alkoxy substituted poly(ethynylenephenylene)s.
KW - Alkoxy substituted poly(ethynylenephenylene)
KW - co-polymer
KW - photoluminescence
KW - sonogashira cross-coupling reaction
KW - x-ray crystallography
UR - http://www.scopus.com/inward/record.url?scp=84928815931&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1007/s12039-015-0789-y
U2 - 10.1007/s12039-015-0789-y
DO - 10.1007/s12039-015-0789-y
M3 - Article
AN - SCOPUS:84928815931
SN - 0974-3626
VL - 127
SP - 365
EP - 374
JO - Journal of Chemical Sciences
JF - Journal of Chemical Sciences
IS - 3
ER -