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Reversible Photochemical Modifications in Dicarbene‐Derived Metallacycles with Coumarin Pendants
Author(s) -
Han YingFeng,
Jin GuoXin,
Daniliuc Constantin G.,
Hahn F. Ekkehardt
Publication year - 2015
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.201411006
Subject(s) - coumarin , chemistry , cycloaddition , ligand (biochemistry) , stereochemistry , irradiation , photochemistry , polymer chemistry , organic chemistry , receptor , catalysis , biochemistry , physics , nuclear physics
Molecular rectangles were obtained from two bis(NHC) ligands, each featuring two terminal coumarin groups and two Ag + , Au + , or Cu + ions. Upon UV irradiation ( λ =365 nm), the dinuclear complexes undergo photochemical modification through a [2+2] cycloaddition reaction of two adjacent coumarin moieties to give a macrocyclic tetra(NHC) ligand. The photodimerization of the coumarin pendants proceeds stereoselectively to give the syn‐head‐head isomers in all cases. Subsequent irradiation at λ =254 nm initiates a photocleavage reaction with reconstitution of the initial dinuclear complexes with coumarin pendants.
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