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Chemically and thermally ultra-stable Ba(ii) coordination polymer with dual fluorescence sensing and high proton conductivity
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DOI：10.1039/d6tc00378h.png)
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Abstract
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Achieving multifunctionality in coordination polymers while maintaining long-term structural robustness remains a fundamental challenge. Here, we report a chemically and thermally ultra-stable Ba(ii) coordination polymer {[Ba(H2L)(H2O)(2.5)] H2O}(n), (1, H4L= 3,5-bis(3 ',5 '-dicarboxyphenyl)-1H-1,2,4-triazole), rationally designed by integrating electronically inert metal nodes with heteroatom-rich triazole ligands. The resulting framework features densely interconnected coordination motifs, reinforced by cooperative pi-pi stacking interactions and hydrogen-bonded water networks. These interaction-coupled structural motifs simultaneously rigidify the ligand-centered electronic states for reliable fluorescence sensing toward Fe3+ and nitrobenzene, and establish continuous proton-transport pathways with a conductivity of 1.99 & times; 10(-4) S cm(-1) at 75 degrees C and 100% relative humidity. Notably, both functionalities originate intrinsically from the same structural motifs rather than independent components, enabling sustained performance under harsh conditions. This work demonstrates an interaction-coupled design paradigm for constructing robust multifunctional coordination materials.
Keywords:
METAL-ORGANIC FRAMEWORKS
MECHANICAL STABILITY
NITROBENZENE
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