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Molecular System Based on Novel Photochromic Biindenylidenedione Derivative Demonstrating Photomodulation of Magnetism
Author(s) -
Chen Yong,
Pang Meili,
Cheng Kaige,
Wang Ying,
Meng Jiben
Publication year - 2012
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201200161
Subject(s) - photochromism , chemistry , nitroxide mediated radical polymerization , photochemistry , antiferromagnetism , radical , benzene , magnetism , derivative (finance) , spectroscopy , organic chemistry , polymer , physics , radical polymerization , quantum mechanics , economics , financial economics , copolymer , condensed matter physics
Stable nitronyl nitroxide radical and imino nitroxide radical were incorporated into the benzene rings of novel photochromic 7,7′‐dimethyl‐[2,2′‐bi‐1 H ‐indene]‐3,3′‐diethyl‐3,3′‐dihydroxy‐1,1′‐dione ( 1 ), leading to the synthesis of novel multifunctional compounds 4 and 5 . The photochromic properties, ESR spectroscopy and magnetic properties of the title compounds were investigated. Compounds 4 and 5 possess visible photochromism upon photoirradiation, and their ESR signals undergo secular broadening after photoirradiation. The magnetic susceptibility measurement shows that the antiferromagnetic interaction of 4 and 5 becomes stronger after photoirradiation. In compounds 4 and 5 there are two kinds of spin centers after photoirradiation: one is nitroxide radical, and the other is photo‐generated radicals from two indanone moieties. Our results demonstrated that the colour and magnetic properties of compounds 4 and 5 could be modulated by photoirradiation.