Syntheses, structures and catalytic properties of Evans–Showell-type polyoxometalate-based 3D metal–organic complexes constructed from the semi-rigid bis(pyridylformyl)piperazine ligand and transition metals. - Li, Feng-Cai; Tan, Li-Kun; Li, Xi-Li; Kong, Hua-Jie; Ge, Li-Ming; Yue, Ling-Yu; Han, Li-Feng (Dalton Transactions: An International Journal of Inorganic Chemistry, 2019)