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Phosphomolybdate; Strandberg-type; supramolecular interactions; electrochemical behavior

Two new Strandberg-type cluster-based phosphomolybdates {H-2a3mp}5[{PO3(OH)}{PO4}-Mo5O15], 1 and {H-2a4mp}₅[{PO₃(OH)}{PO₄}Mo₅O₁₅].6H₂O, 2 have been crystallized via solvent evaporationtechnique using 2-amino-3-methylpyridine (2a3mp) and 2-amino-4-methylpyridine (2a4mp) respectively. The solids were characterized using single-crystal X-ray diffraction, powder X-ray diffraction,fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy and cyclic voltammetry. The solid 1 crystallized in monoclinic system with space group P2₁/c, a = 8.394(1),b = 27.398(6), c = 21.521(4) A ^° , b = 97.68(3)^°, Z = 4. The solid 2 crystallized in triclinic system with space group P-1, a = 11.728(1), b = 14.234(1), c = 19.589(1) A ^° , a = 68.906(3), b = 89.454(3), c = 66.559(3)^°,Z = 2. The solids 1 and 2 formed a supramolecular framework stabilized by hydrogen bonding interaction between cluster anions and organic moieties. CH…p interactions between the organic moieties reinforced thecrystal packing in 1 and 2. While crystal packing effects resulted in the formation of solvent-accessible voids in 1; aggregation of lattice water molecules in 2 facilitated the formation of pentameric water cluster. In addition, electrochemical behavior of 1 and 2 has also been investigated

JISHA JOSEPH¹ CINU WINSON¹ BHARTI SINGH² JEMINI JOSE³ JENCY THOMAS¹

1. Centre for Sustainability Science, Research & PG Department of Chemistry, St. Thomas College (Autonomous), Thrissur, Kerala 680 001, India
2. Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110 016, India
3. Department of Chemistry, CHRIST (Deemed to be University), Bengaluru 560 029, India

Published

7 October 2020

Manuscript received

5 May 2020

Manuscript revised

2 July 2020

Accepted

9 July 2020