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Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

Temperature dependent self-assembly of lanthanide coordination polymers based on a benzimidazolium dicarboxylate linker: synthesis, structure and luminescence properties

Li-Xin You https://orcid.org/0000-0003-1017-3901 A B * , Wen-Yu Wang B , Xiao-Juan Wang B , Gang Xiong B , Shu-Ju Wang B , Fu Ding B , Jin-Guang Liang A * and Ya-Guang Sun B *
+ Author Affiliations
- Author Affiliations

A Liaoning Provincial Key Laboratory of Energy Storage and Utilisation, Yingkou, 115014, PR China.

B Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province, Shenyang University of Chemical Technology, Shenyang, 110142, PR China.


Handling Editor: Stuart Batten

Australian Journal of Chemistry 77, CH24065 https://doi.org/10.1071/CH24065
Submitted: 14 May 2024  Accepted: 21 August 2024  Published online: 18 September 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing.

Abstract

Five new coordination polymers, namely [Ln(L)(NO3)2]n (Ln = La (1), Pr (2) and Sm (3)), [Eu(L)(NO3)2·1.5H2O]n (4) and [Tb(L)(OAc)2(H2O)·3H2O]n (5) (HOAc = CH3COOH), were synthesised by reaction of lanthanide nitrates with 1,3-bis(4-carboxybenzyl)benzimidazolium chloride (H2L+Cl) under solvothermal conditions. All the coordination polymers were characterised by powder X-ray diffraction, infrared spectroscopy, thermogravimetric analysis, elemental analysis and single crystal X-ray diffraction. Complexes 15 exhibit two different 2-D structures due to the variation in reaction temperature. Complexes 14 are isostructural and crystallised in the monoclinic system, C2/c space group, showing a two-dimensional layer with Ln chains linked by L ligands. Complex 5 crystallised in the P21/n space group, featuring a 2-D layer different from 14 with Tb dimers linked by L ligands through carboxylates. Further, the luminescence properties of complexes 35 were investigated. In addition, the fluorescence lifetime and quantum efficiency of complex 4 were measured.

Keywords: 1,3-bis(4-carboxybenzyl)benzimidazolium chloride, crystal structure, fluorescence lifetime, lanthanide contraction effect, lanthanide coordination polymer, luminescence, quantum efficiency, self-assembly.

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