Synthesis, structure and properties of three novel transition-metal-containing tantalum-phosphate clusters

Peroxide ligation of aqueous metal–oxo clusters provides rich speciation and structural diversity. Here, three novel transition-metal derivatives of polyoxometalate anions, [Ni 2 (H 2 O) 10 {P 4 Ta 6 (O 2 ) 6 O 24 }] 6– (1a), [Zn(H 2 O) 4 {P 4 Ta 6 (O 2 ) 6 O 24 }] 8– (2a) and [Cd(H 2 O) 4 {P 4 Ta 6 (O 2 ) 6 O 24 }] 8– (3a), have been successfully synthesized by adopting a one-pot reaction strategy. All of these hexatantalates are built from a new-type phosphorus-incorporated hexatantalates. We investigated the solution behaviors, and the peak assignments of the MS spectra indicated some degree of stability of them in water. Furthermore, the proton-conducting ability of compound 1a was also explored and it has shown well conductivity at high relative humidities, with conductivity achieved 1.22 × 10 – 3 S/cm (85 °C, 90%RH). Three novel transition-metal-containing phosphorus-incorporated hexatantalates [Ni 2 (H 2 O) 10 {P 4 Ta 6 (O 2 ) 6 O 24 }] 6– , [Zn(H 2 O) 4 {P 4 Ta 6 (O 2 ) 6 O 24 }] 8– , [Cd(H 2 O) 4 {P 4 Ta 6 (O 2 ) 6 O 24 }] 8– which regard [P 4 Ta 6 (O 2 ) 6 O 24 ] 10– as second building block were synthetized by a one-pot synthetic assembly method.