✦ LIBER ✦

Phase transitions and the fluorescence emission of p-terphenyl single crystals

✍ Scribed by John O. Williams

Publisher: Elsevier Science
Year: 1976
Tongue: English
Weight: 333 KB
Volume: 42
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(76)80578-7

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✦ Synopsis

The fluorescence emission of p-terphenyl <TP) molecules in solution and in the crystalline state at various temperatures in the range 300-4 K are comparad The appeasance of new bands at higher energies with decreasing temperature ccirresponds with a phase transitlon m the aystanine materiaL The outer and central rings of the molecule are known to be inclined at angles between 16 and 29 in this low temperature modification and It is concluded that a similar molecular confiiuratlon exists in solution. Broad vl%roGc peaks observed at 4 K are consistent with structures exhibiting long range disorder in which the long molecular axs may adopt variable orlcntations and where the rmgs assume a number of different relative inclinations. The absorption and fluorescence characteristics of polyphenyl molecules e g. biphenyl (BP), p-terphenyl (TP) and p-quarterphenyl (QP) in solution have been

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