Photophysical and Theoretical Interpretation of the Insensitive Emission to Temperature of a Metallopolymer Containing Europium Ions

Abstract

The luminescence and thermochromic properties of a europium-containing metallopolymer were investigated in experimental and theoretical aspects using the same polymer backbone complexed with two different contents of europium ions (25 and 65% molar). The polymer presented an emission insensitive to temperature variation which was attributed to a balance between two factors: the first is the “stiffening effect” on the polymer backbone brought about by ion complexation, and the second is the interconnection of the alkyl chains because of the rotation of the bipyridine sites required for the complexation.

Water-Soluble Cationic Eu3+-Metallopolymer with High Quantum Yield and Sensitivity for Intracellular Temperature Sensing

“…Interestingly, according to the temperature-responsive properties of the Eu 3+ -metallopolymer reported previously, the polymer backbone may present an emission insensitive to temperature variation due to the “stiffening effect” brought about by the Ln 3+ complexation, as well as the interconnection of the alkyl chains. − However, in the present work, the emission from the polymer backbone exhibited an evident decrease upon increasing the temperature. Thus, it will be meaningful to explore the thermal quenching mechanism.…”

Tetraphenylethylene-based Eu3+-metallopolymers with aggregation-enhanced white emission for self-calibrating temperature sensing and white light-emitting diodes (WLEDs)

“…54 In contrast, the fluorescence emission from the VTPE unit at around 483 nm remains nearly unchanged with the increase of the temperature, even remaining nearly the same at a temperature as high as 383 K, that is totally different from the fluorescence quenching behaviour of the TPE contained pure organic copolymer at high temperatures, 55 this interesting phenomenon can be due to the ''stiffening effect'' on the polymer matrix brought about by the Eu 3+ ion coordination. 56 On one hand, it results in a remarkable emission colour change of poly-Eu(TTA) 3 (2) from white (0.331, 0.310) at room temperature to bluish-green (0.240, 0.319) at 383 K (see Table S3, ESI †), on the other hand, the emission peak of the VTPE unit can also be used as a ''built-in standard'', endowing poly-Eu(TTA) 3 (2) with excellent ratiometric temperature sensing properties. Fig.…”

Blending as a Strategy to Attain Chiro‐Optically Activity Polymers

“…At the same time, the substituents in the carbazole moiety (LaPPS73) and in the fluorene unit (PF6BT) have the same length, to promote chain interaction through inter-digitalization, as described previously. [29,30] This inter-digitalization might be playing a role in the assembly of the PF6BT chains. In this paper we employ a similar strategy with different backbones, using as blend components a chiral alternated copolymer of fluorene-carbazole (LaPPS73) and an achiral alternated copolymer of fluorene-benzothiadiazole (PF6BT).…”