Hybrid proton-containing decavanadate-organic crystal: synthesis, structure and enhancement of proton-conducting performance

• Published in: Journal of the Iranian Chemical Society 2023-06, Vol.20 (6), p.1345-1356
• Main Authors: Amar, Tawel Oumrou Taleb, Maalaoui, Ahlem, Boukhachem, Abdelwaheb, Aride, Jilali, Rzaigui, Mohamed, Akriche, Samah Toumi
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Aqueous solutions; Biochemistry; Cations; Chemical synthesis; Chemistry; Chemistry and Materials Science; Conduction; Crystal structure; Differential thermal analysis; Fuel cells; Inorganic Chemistry; Organic Chemistry; Organic crystals; Original Paper; Physical Chemistry; Protons; Single crystals; Surface analysis (chemical); Topology
• ISSN: 1735-207X; 1735-2428
• DOI: 10.1007/s13738-023-02759-0

A new decavanadate hybrid material, (C 4 H 7 N 2 S) 4 [H 2 V 10 O 28 ]·4H 2 O, (2A4MT V10), was successfully grown in aqueous solution as single crystals with acidic decavanadate (V10) cluster and 2-amino-4-methyltiazolium (2A4MT) cation. It was thoroughly characterized by XRD, IR, DTA-TGA and alternating current impedance spectroscopy measurements. Crystal structure of (2A4MT V10) exhibits a typical 3D-porous supramolecular topology of diprotonated V10 clusters and water molecules featuring tunnel-voids filled with 2A4MT cations mainly connected through O···H/H···O, H bonding with considerable contributions of 65.9% as indicated by Hirshfeld surface analysis. The conductivity study shows that the hybrid crystal possesses significant conductivities above 10 −4 S cm −1 in the temperature range of 130–180 °C to rich 9 × 10 −4  S cm −1 at 423 K (150 °C), which can be considered as promising proton conductor for fuel cell applications.