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Reversible SC‐SC Transformation involving [4+4] Cycloaddition of Anthracene: A Single‐Ion to Single‐Molecule Magnet and Yellow‐Green to Blue‐White Emission
Author(s) -
Huang XinDa,
Xu Yan,
Fan Kun,
Bao SongSong,
Kurmoo Mohamedally,
Zheng LiMin
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201804102
Subject(s) - anthracene , ion , cycloaddition , molecule , photochemistry , lanthanide , crystallinity , single molecule magnet , chemistry , irradiation , materials science , crystallography , organic chemistry , magnetization , magnetic field , physics , quantum mechanics , catalysis , nuclear physics
In search of magneto‐optic materials, the mononuclear compounds Ln III (depma)(NO 3 ) 3 (hmpa) 2 (Ln=Dy, Gd) were synthesized. The anthracene moieties undergo [4+4] dimerization when irradiated at 365 nm without loss of crystallinity. The Dy compound switches from a single‐ion to a single‐molecule magnet with doubling of the spin reversal barrier energy and from yellow‐green to blue‐white emission. The dimerization is reversed by heating at 100 °C or partially on light irradiating at 254 nm. The results suggest that lanthanide phosphonates with anthracene are promising smart materials displaying synergistic magneto‐optic property.