Synthesis and characterisation of p-block complexes of biquinoline at different ligand charge states.

The first examples of p-block coordination complexes of biquinoline, namely [(biq)BCl2 ]Cl and [(biq)BCl2 ]˙, were synthesized and structurally characterized. The acquired data allowed the estimation of the ligand charge state based on its metrical parameters. The subsequent use of this protocol, augmented with theoretical calculations, revealed ambiguities in the published data for transition metal complexes of biquinoline.