Design, Synthesis, and Electrical Performance of Three-Dimensional Hydrogen-Bonded Imidazole-Octamolybdenum-Oxo Cluster Supramolecular Materials

TL;DR

This paper describes the design and synthesis of new supramolecular materials with potential applications in electrocatalysis and information storage.

Contribution

The study introduces two novel organic–inorganic hybrid compounds with unique three-dimensional structures and temperature-sensitive dielectric properties.

Findings

Compounds 1 and 2 crystallized in the P-1 space group with stable 3D structures due to hydrogen bonding.

Compound 2 showed significant dielectric anomalies at 250 and 260 K due to cation and water molecule oscillations.

The materials were synthesized using hydrothermal and evaporation methods with imidazole and polyacid anion templates.

Abstract

Polyoxometalate (POM)-type supramolecular materials have unique structures and hold immense potential for development in the fields of biomedicine, information storage, and electrocatalysis. In this study, (NH4)3 [AlMo6O24H6]·7H2O was employed as a polyacid anion template, pentacyclic imidazole molecules served as organic ligands, and the moderate-temperature hydrothermal and natural evaporation methods were used in combination for the design and synthesis of two octamolybdenum-oxo cluster (homopolyacids containing molybdenum-oxygen structures as the main small-molecular structures)-based organic–inorganic hybrid compounds, [(C3N2H5)(C3N2H4)][(β-Mo8O26H2)]0.5 (1) and {Zn(C3N2H4)4}{[(γ-Mo8O26)(C3N2H4)2]0.5}·2H2O (2). Structural and property characterization revealed that both compounds crystallized in the P-1 space group with relatively stable three-dimensional structures under the action of hydrogen bonding. Upon temperature stimulation, the [Zn(C3N2H4)4]2+ cation and water molecules in 2 exhibited obvious oscillations, leading to significant dielectric anomalies at approximately 250 and 260 K when dielectric testing was conducted under heating conditions.

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