As expected, the amino-carbon bond N2-C3 in 7 (1.5150(63) Å) clearly exceeded the 1.2725(10) Å found for the N2-C3 imino-carbon bond length present in 9. Another noticeable difference between 8 and 9 in terms of bonding was observed in the ligand backbones where the C2-C3 bond lengths amounted to 1.4871(84) Å (8) and 1.4451(13) Å (9), respectively. As it can be seen from Table , not only the bonding distances except from the above discussed ones but also the bond angles in 8 and 9 were found to be very similar which masks to some extend the pronounced structural difference between the two complexes: Lacking a conjugated This disorder may be referred to as fractional superposition, was more present in 10 than in 11 and a structural solution could be found by description of disordered ligands with two parts. and Co(TMSAEDMA)2 ( ) drawn with thermal ellipsoids at 50 % probability level. Hydrogens are omitted for clarity. The structure of 9 is reproduced from the data provided by Wei. For the structure of 10, the superposition of partially disordered ligands is omitted for clarity.