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Distortional Supramolecular Isomers of Polyrotaxane Coordination Polymers: Photoreactivity and Sensing of Nitro Compounds
Author(s) -
Park InHyeok,
Medishetty Raghavender,
Kim JaYeon,
Lee Shim Sung,
Vittal Jagadese J.
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201310536
Subject(s) - supramolecular chemistry , chemistry , ligand (biochemistry) , nitro , reactivity (psychology) , cycloaddition , quenching (fluorescence) , ring (chemistry) , reagent , coordination complex , cis–trans isomerism , stereochemistry , crystallography , crystal structure , fluorescence , organic chemistry , catalysis , metal , medicine , biochemistry , alkyl , receptor , alternative medicine , physics , pathology , quantum mechanics
Distortional isomers, or bond‐stretch isomers, differ only in the length of one or more bonds, which is due to crystallographic disorder in most cases. The term distortional isomerism is introduced to describe the structures of polyrotaxane 2D coordination polymers (CPs) that differ only by the relative positions in the neighboring entangled axles. A large ring and a long spacer ligand in 2D CPs yielded four different supramolecular isomers, of which two have an entangled polyrotaxane structure. One pair of CC bonds in the spacer ligand is well‐aligned in one isomer and undergoes [2+2] cycloaddition reaction, whereas the other isomer is photoinert. They also have different sensing efficiency for several aromatic nitro compounds. However, both isomers show selective PL quenching for the Brady’s reagent. Structurally similar supramolecular isomers with different photochemical reactivity and sensing abilities appear to be unprecedented.