Work

Assembly of Four Ternary Polyoxometalate Aggregates by Integrating Presynthesized {XW 9 Nb 3 O 40 } (X = Si/Ge) Units Using Molybdenum-Oxo Clusters

Year: 2024

Type: article

Abstract: Polyoxometalates (POMs) have good potential for applications in different fields, including conducting materials, optics, and electrocatalysis. Of particular significance is the synthesis and development of addendum POMs. Molybdenum-oxo clusters, which are renowned for their diverse structures and electronic properties, were utilized to facilitate the synthesis of innovative materials. Herein, we employed presynthesized {XW 9 Nb 3 O 40 } (X= Si/Ge) polyanions as secondary building units and different molybdenum-oxo clusters as linkers. Four new addendum POMs were constructed, including two dimeric compounds Cs 10 [H 2 (SiW 9 Nb 3 O 40 ) 2 (Mo 2 O 4 C 2 O 4 )]·19H 2 O ( 1 ) and Cs 8 [H 4 (GeW 9 Nb 3 O 40 ) 2 (Mo 2 O 4 C 2 O 4 )]·17H 2 O ( 2 ), and two tetrameric compounds Cs 15 (NH 4 )[(SiW 9 Nb 3 O 40 ) 4 (Mo 4 O 6 )]·42H 2 O ( 3 ) and Cs 10 K 5 [H(GeW 9 Nb 3 O 40 ) 4 (Mo 4 O 6 )]·39H 2 O ( 4 ). Notably, this is the first report of Mo/W/Nb ternary mixed-addendum POMs. In addition, compounds 3 and 4 facilitate the transfer of protons through extended hydrogen-bonding networks with conductivity values of 1.16 × 10 –2 and 7.73 × 10 –3 S·cm –1 at 85 °C and 98% relative humidity, respectively. Furthermore, no discernible decline in conductivity was noted over the course of 10 h.

Source: Inorganic Chemistry

DOI: 10.1021/acs.inorgchem.4c04359