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A Europium(III) Complex Embedded in a Polysulfone Host Matrix: A Flexible Film with Temperature‐Responsive Ratiometric Behaviour
Author(s) -
Outis Mani,
Leal João P.,
Avó João,
Monteiro Bernardo,
Pereira Cláudia C. L.
Publication year - 2020
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.202000710
Subject(s) - polysulfone , chemistry , europium , lanthanide , luminescence , quantum yield , ion , yield (engineering) , photochemistry , matrix (chemical analysis) , optoelectronics , polymer , organic chemistry , optics , composite material , materials science , fluorescence , physics , chromatography
An emissive europium(III) complex [C 2 mim][Eu(fod) 4 ] ( 1 ; C 2 mim=1‐ethyl‐3‐methyl‐imidazolium; fod=1,1,1,2,2,3,3‐heptafluoro‐7,7‐dimethyloctane‐4,6‐dionate) was prepared. The complex shows ratiometric thermal behaviour up to 155 °C. These unusual temperature‐dependent properties arise from a solid‐solid phase transition that promotes increased contact between the anion and the cation, affecting the emission profile of the emissive anion in two different ratiometric relations. A ultrabright and flexible emissive photopolymer film was obtained using polysulfone ( PSU ) as the host matrix of 10 % (w/w) of 1 , that also induced changes on the lanthanide emissive profile with temperature. A temperature‐responsive luminescent film 1/PSU is sensitivr to heating between 100 and 155 °C. Also, the emission lifetime of 1 was not affected by confinement in PSU, while its emission quantum yield was reduced from 82 to 59 %.