Reversible SC‐SC Transformation involving [4+4] Cycloaddition of Anthracene: A Single‐Ion to Single‐Molecule Magnet and Yellow‐Green to Blue‐White Emission

In search of magneto‐optic materials, the mononuclear compounds LnIII(depma)(NO3)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 w...

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Published in:Angewandte Chemie International Edition Vol. 57; no. 28; pp. 8577 - 8581
Main Authors: Huang, Xin‐Da, Xu, Yan, Fan, Kun, Bao, Song‐Song, Kurmoo, Mohamedally, Zheng, Li‐Min
Format: Journal Article
Language:English
Published: Germany Wiley Subscription Services, Inc 09.07.2018
Edition:International ed. in English
Subjects:
Anthracene
Clean energy
Cycloaddition
Dimerization
dysprosium
Dysprosium compounds
Emission
Emissions
Gadolinium
Magnetic properties
Molecular chains
Optical materials
Phosphonates
photocycloaddition
single-molecule magnets
Smart materials
Switches
white light
anthracene
photocycloaddition
dysprosium
white light
single-molecule magnets
ISSN:1433-7851, 1521-3773
Online Access:Get full text
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Summary:In search of magneto‐optic materials, the mononuclear compounds LnIII(depma)(NO3)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. Pairing up: The mononuclear compound DyIII(depma)(NO3)3(hmpa)2 (depma= 9‐diethylphosphono‐methylanthracene, hmpa=hexamethylphosphoramide) undergoes reversible [4+4] photodimerization in a single‐crystal‐to‐single‐crystal manner. This process is accompanied by a change from a single‐ion to a single‐molecule magnet and from yellow‐green to blue‐white emission.
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ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201804102