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In Situ Methylation Transforms Aggregation‐Caused Quenching into Aggregation‐Induced Emission: Functional Porous Silsesquioxane‐Based Composites with Enhanced Near‐Infrared Emission
Author(s) -
Yan Yehao,
Laine Richard M.,
Liu Hongzhi
Publication year - 2019
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201900568
Subject(s) - silsesquioxane , quenching (fluorescence) , thermal stability , malononitrile , fluorescence , fluorophore , materials science , porosity , photochemistry , chemistry , organic chemistry , composite material , polymer , catalysis , physics , quantum mechanics
Methylation of TPA‐DCM (2‐(2,6‐bis‐4‐(diphenylamino)stryryl‐4H‐pyranylidene)malononitrile) that exhibits aggregation‐caused quenching (ACQ) results in the fluorophore M‐TPA‐DCM (2‐(2,6‐bis((E)‐4‐(di‐ p ‐tolylamino)‐styryl)‐4H‐pyran‐4‐ylidene]malononitrile) that shows aggregation‐induced emission (AIE) and NIR fluorescence and has a conjugated “D‐π‐A‐π‐D” electronic configuration. Friedel‐Crafts reaction of TPA‐DCM and octavinylsilsesquioxane (OVS) resulted in a family of porous materials (TPAIEs) that contain the M‐TPA‐DCM motif and show large Stokes shifts (180 nm), NIR emission (670 nm), tunable porosity (S BET from 160 to 720 m 2 g −1 , pore volumes of 0.13–0.55 cm 3 g −1 ), as well as high thermal stability (400 °C, 5 % mass loss, N 2 ). As a simple test case, one of TPAIE materials was used to sense Ru 3+ ions with high selectivity and sensitivity.