Spectroscopic studies of polydiacetylene solutions and glasses

✍ Scribed by S.D.D.V. Rughooputh; D. Phillips; D. Bloor; D.J. Ando

• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 526 KB
• Volume: 106
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(84)80289-4

✦ Synopsis

Absorption, Tluoresccncc excimtion end emission spcc~rs of rr soluble polydi~cctpl~ne.obtllincd by the solid-state polymerization of the bis-(phcnyl xctore) czter of 10,12_docosadiyne-I. Zl4iol. have been recorded 31 room and liquidnitrogen temperatures for different solvents. Spectral shifts. similar IO those reported for other soluble polydiacctylcncs, xc obscrvcd on addition of a non-solvent or on cooling the solutions. The tluorcsccnce quantum yield uas mcasurcd from 2-methyl tctrahydrofuran solution ot room temper~rurc. The yield \ves roughly one hundred times Ixrger ior this system at 77 K and well-structured fluorescence spectra were observed ior this lo\-temprmturc glass.

l_ introduction

The availability of macroscopic single crystals of poiydiacetylenes (hereafter referred to as PDAs) of a high degree of perfection has led to extensive studies of their properties. Such perfect samples are obtained by the solid-state polymerization Chemical Engineering Department at Imperial College for r-irradiation of samples.