Table shows key structural parameters for the ALDIPYs including the sigma parameter which represents the sum of the deviation from 90° of the angles in the coordination sphere (of the metal atom) reflecting the deformation of the octahedron. Sigma values determine the distortion of the complexes, the larger the value the higher distortion from the ideal octahedral conformation. Complexes 13b, 13d, 13j and 20 showed the higher distortion (sigma = 15-21), presumably due to their bulkier substitution that induces more strain within the molecules. However, all structures are very close to the ideal octahedral configuration.