Syntheses, structures and properties of three Keggin-based metal–organic complexes derived from flexible bis-pyridyl-bis-amide and rigid phenanthroline mixed ligands.

Highlights: [•] Three Keggin-based complexes have been obtained with two N-donor mixed ligands. [•] The space length of bis-pyridyl-bis-amide shows obvious effect on the final structures. [•] Introduction of the secondary phen ligand results in the reduction of dimensionality. [•] The electrochemical behavior of 3 and photocatalytic properties of 1–3 are studied. [Copyright &y& Elsevier]