UNUSUALLY LOW-ENERGY ELECTRONIC-TRANSITIONS IN POLY(DIACETYLENE) SOLUTIONS - SOLVATOCHROMIC AND THERMOCHROMIC BEHAVIOR OF POLY(1,4-BIS(3-QUINOLYL)BUTA-1,3-DIYNE)
DSpace at IIT Bombay
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Title |
UNUSUALLY LOW-ENERGY ELECTRONIC-TRANSITIONS IN POLY(DIACETYLENE) SOLUTIONS - SOLVATOCHROMIC AND THERMOCHROMIC BEHAVIOR OF POLY(1,4-BIS(3-QUINOLYL)BUTA-1,3-DIYNE)
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Creator |
KODALI, NB
KIM, W KUMAR, J TRIPATHY, SK TALWAR, SS |
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Subject |
conjugated ionic polyacetylenes
soluble polydiacetylenes coil transition neutral coils rod polymerization scattering crystals spectra raman |
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Description |
Solutions of poly(1,4-bis(3-quinolyl)buta-1,3-diyne) (PDQ) have shown the lowest energy electronic transitions of all the reported poly(diacetylene)s. Unusual solvato- and thermochromic behavior of PDQ in various polar and nonpolar environments is discussed. The role of hydrogen bonding appears crucial to the solution and chromic behavior in these solutions. pi-Conjugation between the polymer backbone and the cross-conjugated heteroaromatic side groups appears to lead to chain segments with unusually extensive electron delocalization. Stable (over a period of 2 years), dark green, true solutions in phenol-acetonitrile (nonsolvent) (lambda(max) = 733 nm) are obtained. The stability of charged and rigid rod-like PDQ macromolecules is explained in terms of screening of interchain Coulombic interactions.
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Publisher |
AMER CHEMICAL SOC
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Date |
2011-07-15T04:08:11Z
2011-12-26T12:49:14Z 2011-12-27T05:35:02Z 2011-07-15T04:08:11Z 2011-12-26T12:49:14Z 2011-12-27T05:35:02Z 1994 |
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Type |
Article
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Identifier |
MACROMOLECULES, 27(22), 6612-6619
0024-9297 http://dx.doi.org/10.1021/ma00100a054 http://dspace.library.iitb.ac.in/xmlui/handle/10054/4149 http://hdl.handle.net/10054/4149 |
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Language |
en
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