“…[1][2][3][4][5] One special metal-oxido cluster in the POM library, the {P 4 Mo V 6 X 31 }(X = O or OH) unit (abbreviated as {P 4 Mo 6 }), has attracted much interest in recent times owing to its unique features in both structure and reduction states. [6][7][8][9][10][11] Compared with previously investigated POM anions, the reduced Mo V centres of {P 4 Mo 6 } exhibit an electronic configuration of d 1 , leading to a greater distribution of electron density throughout the entire cluster. Moreover, the {P 4 Mo 6 } cluster can be synthesised in situ using readily available starting materials in a hydrothermal environment or through a routine synthesis.…”