In:
Collection of Czechoslovak Chemical Communications, Institute of Organic Chemistry & Biochemistry, Vol. 57, No. 6 ( 1992), p. 1326-1334
Kurzfassung:
2,4,4,6-Tetraphenyl-4 H -thiopyran, C 29 H 22 S, orthorhombic, Pna 2 1 , a = 17.980(4), b = 6.956(2), c = 34.562(11) Å, V = 4323(2) Å 3 , Z = 8, D x = 1.237 g cm -3 , F (000) = 1696, λ(CuK α ) = 1.54184 A, μ = 1.372 mm -2 , T = 294 K. The final R was 0.050 for the unique set of 3103 observed reflections. The central 4 H -thiopyran ring forms a boat conformation for both symmetrically independent molecules with average boat angles 4.4(3) and 6.8(3)° at S and C( sp 3 ), respectively. The mean planes of phenyls at the position 2 and 6 are turned from the double plane of 4 H -thiopyran by 42.5(5) and 35.8(3)°, respectively. The investigated material undergoes a photochromic change in the solid state after irradiation with UV light or X-rays. The maximum of the new absorption band is situated at 564 nm. The non-exponential time dependence of photochromic bleaching is analysed in terms of a dispersive first-order reaction.
Materialart:
Online-Ressource
ISSN:
0010-0765
,
1212-6950
DOI:
10.1135/cccc19921326
Sprache:
Englisch
Verlag:
Institute of Organic Chemistry & Biochemistry
Publikationsdatum:
1992
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