Crystal structures and temperature-dependent photoluminescence of lanthanide coordination frameworks of mixed-benzenedicarboxylates

Abstract

A new series of non-porous, three-dimensional coordination frameworks, i.e. [Ln^III(bdc)_0.5(phth)(H₂O)₂], where Ln^III = Eu^III, Tb^III, Ho^III, Er^III and Tm^III, phth^2- = 1,2-benzenedicarboxylate, and bdc^2- = 1,4-benzenedicarboxylate, were synthesized and characterized. The frameworks have two-dimensional sheets of which the stoichiometry is the same as the framework containing only phth^2-. Architecture, topology and thermal stability of the frameworks were examined. Temperature-dependent photoluminescent properties of the Eu^III and Tb^III frameworks were studied and discussed with reference to those containing only phth^2- and bdc^2-. The mixed Eu^III/Tb^III frameworks were also prepared and their temperature-dependent photoluminescent properties were investigated, revealing energy transfer from Tb^III to Eu^III and its dependence on Eu^III content.

Graphical Abstract

Keywords:

• Lanthanide
• benzenedicarboxylate
• coordination polymer
• photoluminescence

Acknowledgements

T. Chuasaard thanks the Development and Promotion of Science and Technology Talents Project for graduate scholarship. The Thailand Research Fund and Chiang Mai University are acknowledged for research funding.

Disclosure statement

No potential conflict of interest was reported by the author(s).

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Additional information

Funding

This work is co-funded by Chiang Mai University and the Thailand Research Fund (RSA5980026)