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Regioselective complexation in the 2 H ‐chromene series and studies of their photochromic properties
Author(s) -
Hannesschlager Patrick,
Brun Pierre
Publication year - 2000
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/1099-0739(200011)14:11<686::aid-aoc66>3.0.co;2-7
Subject(s) - chemistry , regioselectivity , boron trifluoride , moiety , photochromism , chromium , lewis acids and bases , molar ratio , polymer chemistry , organic chemistry , medicinal chemistry , catalysis
The regioselectivity of the complexation of chromenes with tricarbonyl(trispyridine)chromium [Cr(CO) 3 Py 3 ] can be controlled by the addition of BF 3 ·Et 2 O boron trifluoride etherate. Depending on the molar ratio of the Lewis acid, different complexes can be prepared. The spectrokinetic properties of the so‐formed complexes were studied and it was shown that the thermal bleaching constants are either more or less reduced, depending on the position of the chromium tricarbonyl moiety. Copyright © 2000 John Wiley & Sons, Ltd.