Abstract
Two 3d-4f-5d heterometallic cluster-containing polyoxometalates,formulated as Na22{(SbW9O33)4[La3W6MO18(H2O)8(CH3COO)4]2}.nH2O(abbreviated as La6M2,M=Co/Mn)were synthesized and struc-turally characterized.Single-crystal X-ray diffraction analyses reveal that the polyanions of La6Co2 and La6Mn2 consist of the uncommon 3d-4f-5d clusters {La6W12Co2} and {La6W12Mn2},which are encapsu-lated by four trilacunary Keggin tungstoantimonates to form the parallelogram-shaped title compounds.Additionally,the polyanions can be extended into a two-dimensional(2D)frame by the linkage of periph-eral Na+ions.The inner space of the 2D layer was filled with water molecules and thus an H-bonded network was formed,which is expected to exhibit a fascinating proton conductivity.The study of water-assisted proton conduction demonstrated that La6Co2 and La6Mn2 were temperature-and humidity-dependent proton conductors,respectively,and the proton conductivities could reach 1.3 × 10-2 and 2.3 × 10-2 S/cm at 65 ℃ and 90％RH conditions.
基金项目
国家自然科学基金(22071045)
Excellent Youth Science Fund Project of Henan Province(202300410042)
河南省自然科学基金(232300420372)
Henan University()
State Key Laboratory of Physical Chemistry of the Solid Surface of Xiamen University()
NETL
NSTL
万方数据