Issue 31, 2018

TbCo and Tb0.5Dy0.5Co layered cyanido-bridged frameworks for construction of colorimetric and ratiometric luminescent thermometers

Abstract

Heterometallic cyanido-bridged networks are versatile molecular platforms for diverse optical, magnetic and electronic functionalities. We present a pioneering synthetic route which employs polycyanidometallates in the preparation of unique d–f coordination systems revealing multi-stimuli responsive multi-coloured photoluminescence with potential application in colorimetric and ratiometric temperature sensing. We report two layered cyanido-bridged frameworks, bimetallic {[TbIII(4-OHpy)2(H2O)3][CoIII(CN)6]}·0.5H2O (1) (4-OHpy = 4-hydroxypyridine), and trimetallic {[TbIII0.5DyIII0.5(4-OHpy)2(H2O)3][CoIII(CN)6]}·0.5H2O (2), along with their structural and full physicochemical characterization. They exhibit room temperature visible photoluminescence within an extensive colour range, including white light emission, tunable through the applied lanthanide ions, and switchable by excitation with light through selective excitation of the green emissive TbIII, yellow emissive DyIII, blue luminescent 4-OHpy, and red luminescent [Co(CN)6]3− components. The emission properties of 1 and 2, including the energy transfer from organic ligands and cyanide complexes towards lanthanide ions, are strongly modulated by the change of temperature in the broad 120–300 K range. As a result, colorimetric luminescent temperature sensing exploiting a wide emission colour range was achieved for both 1 and 2. Moreover, 2 reveals the temperature dependent ratio between the intensities of sharp emission lines of TbIII and DyIII which can be used as a thermometric parametric for ratiometric luminescent detection of temperature. The related thermometer perfomance was examined for various excitation wavelengths, and the best parameters of relative thermal sensitivity, Sr > 1% K−1, with the maximal value 2.2(3)% K−1, and temperature uncertainty, δT < 1 K, are detected for 270 nm excitation in the range 120–200 K.

Graphical abstract: TbCo and Tb0.5Dy0.5Co layered cyanido-bridged frameworks for construction of colorimetric and ratiometric luminescent thermometers

Supplementary files

Article information

Article type
Paper
Submitted
18 मार्च 2018
Accepted
20 जून 2018
First published
21 जून 2018

J. Mater. Chem. C, 2018,6, 8372-8384

TbCo and Tb0.5Dy0.5Co layered cyanido-bridged frameworks for construction of colorimetric and ratiometric luminescent thermometers

K. Kumar, S. Chorazy, K. Nakabayashi, H. Sato, B. Sieklucka and S. Ohkoshi, J. Mater. Chem. C, 2018, 6, 8372 DOI: 10.1039/C8TC01305E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements