Shankar Ravi, Jakhar Ekta, Chauhan Priyanka, Dubey Archishmati, Tiwari Pankaj Kr, Basu Suddhasatwa
Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
Inorg Chem. 2022 Aug 1;61(30):11550-11555. doi: 10.1021/acs.inorgchem.2c00497. Epub 2022 Jul 20.
The study describes the synthesis and structural attributes of two new cadmium phosphites, [Cd{OP(O)(OH)H}(4,4'-bipy)] () and [Hpip][Cd(HPO)(HO)]·HO (). The structure of adopts a two-dimensional motif featuring alternate [Cd-μ-O] and [Cd-O-P-O]-cyclic rings, while the inorganic chains are held together by 4,4'-bipyridine. The presence of strong hydrogen bonding interactions between the appended HPO groups (O---O = 2.55 Å) provides a facile proton conduction pathway and results in a proton conductivity of 3.2 × 10 S cm at 75 °C under 77% relative humidity (RH). Compound comprises an anionic framework formed by vertex-shared [Cd-O-P-O]-cyclic rings, while the [Hpip] cations between the adjacent chains assist a well-directed O-H---O hydrogen-bonded network between coordinated water, lattice water, and phospite groups. The bulk proton conductivity value under conditions as in reaches 4.3 × 10 S cm. For both and , the proton conductivity remains practically unchanged under ambient temperatures (25-35 °C), suggesting their potential in low-temperature fuel cells.
