A Crown-Shaped 24-Molybdate Cluster Constructed by Organotriphosphonate Ligand

A crown-shaped organic–inorganic hybrid polyoxomolybdate, Na5[H7{N­(CH2PO3)3}­Mo6O16(OH) (H2O)4]4·18H2O (1) has been presented and characterized. Such an intriguing structure consists of a 24-molybdenum-membered polyanion constructed by organotriphosphonate ligands, which represents the highest nuclearity of metal atoms in the area of organophosphonate-based polyoxometalates.本工作报道并表征了一种冠状有机-无机杂化多钼酸盐（polyoxomolybdate），其化学式为Na₅[H₇{N(CH₂PO₃)₃}Mo₆O₁₆(OH)(H₂O)₄]₄·18H₂O（标记为化合物1）。该化合物具有独特的结构：其多阴离子骨架由有机三膦酸配体构筑得到24钼元环状多阴离子，这是目前基于有机膦酸的多金属氧酸盐（polyoxometalates）领域中金属原子核数最高的体系。