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Anion-mediated encapsulation-induced emission enhancement of an IrIII complex within a resorcin[4]arene hexameric capsule

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Title: Anion-mediated encapsulation-induced emission enhancement of an IrIII complex within a resorcin[4]arene hexameric capsule
Authors: Horiuchi, Shinnosuke / Matsuo, Chiharu / Sakuda, Eri / Arikawa, Yasuhiro / Clever, Guido H. / Umakoshi, Keisuke
Issue Date: 27-May-2020
Publisher: Royal Society of Chemistry
Citation: Dalton transactions, 49(25), pp.8472-8477; 2020
Abstract: Understanding of encapsulation processes in confined inner spaces of self-assembled hosts is important for the rational creation of supramolecular systems showing unusual reactivities and physical properties through molecular recognition. Herein we report the formation of luminescent supramolecular host-guest complexes consisting of a hydrogen-bonded resorcin[4]arene hexameric capsule and a variety of emissive Ir complex salts. The Ir complexes, accompanied by small counter anions (Cl-, Br-, NO2-, I- and NO3-), are trapped effectively to show large encapsulation-induced emission enhancement (EIEE) behavior, while Ir complexes having large counter anions (ClO4-, PF6- and OTf-) are not stabilized within the capsule, suggesting that the Ir complex cation is trapped together with its counter anion to form an ion-pair in the capsule. Hydrogen-bonding capabilities of the counter anions also contribute to stabilize host-guest association, because the counter anions trapped within the capsule were in contact with the hydrophilic surfaces of the capsule.
URI: http://hdl.handle.net/10069/40146
ISSN: 14779226
DOI: 10.1039/D0DT01485K
Rights: © The Royal Society of Chemistry 2020
Type: Journal Article
Text Version: author
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/40146

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