Controlled assembly and solution observation of a 2.6 nm polyoxometalate 'super' tetrahedron cluster: [KFe_(12)(OH)_(18)(α-1,2,3-P_2W_(15)O_(56))_4]~(29-)

摘要

A nanoscale Fe~Ⅲ-substituted polyoxotungstate [KFe_(12)(OH)_(18-) (α-1,2,3-P_2W_(15)O_(56)]~(29-) is synthesized starting from the trilacunary {P_2W_(15)} Dawson cluster and [Fe_3(μ_3-O)-(CH_2=CHCOO)_6(H_2O)_3]~(1+) to give a 2.6 nm tetrahedral cluster species and the 16 kDa cluster can be directly observed in solution as revealed by mass spectrometry studies.