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Long‐Range LMCT Coupling in Eu III Coordination Polymers for an Effective Molecular Luminescent Thermometer **
Author(s) -
Kitagawa Yuichi,
Kumagai Marina,
Ferreira da Rosa Pedro Paulo,
Fushimi Koji,
Hasegawa Yasuchika
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202002628
Subject(s) - chrysene , lanthanide , luminescence , phosphine oxide , polymer , quantum yield , chemistry , materials science , atmospheric temperature range , coordination polymer , intermolecular force , europium , ion , thermal stability , inorganic chemistry , photochemistry , phosphine , molecule , organic chemistry , catalysis , fluorescence , physics , optoelectronics , quantum mechanics , meteorology , anthracene
A design for an effective molecular luminescent thermometer based on long‐range electronic coupling in lanthanide coordination polymers is proposed. The coordination polymers are composed of lanthanide ions Eu III and Gd III , three anionic ligands (hexafluoroacetylacetonate), and a chrysene‐based phosphine oxide bridges (6,12‐bis(diphenylphosphoryl)chrysene). The zig‐zag orientation of the single polymer chains induces the formation of packed coordination structures containing multiple sites for CH‐F intermolecular interactions, resulting in thermal stability above 350 °C. The electronic coupling is controlled by changing the concentration of the Gd III ion in the Eu III ‐Gd III polymer. The emission quantum yield and the maximum relative temperature sensitivity ( S m ) of emission lifetimes for the Eu III ‐Gd III polymer (Eu:Gd=1:1, Φ tot =52 %, S m =3.73 % K −1 ) were higher than those for the pure Eu III coordination polymer ( Φ tot =36 %, S m =2.70 % K −1 ), respectively. Enhanced temperature sensing properties are caused by control of long‐range electronic coupling based on phosphine oxide with chrysene framework.