Twelve quasi-aromatic metal ( I ) complexes were synthesized from the
AEH (APH) and imidazole (benzimidazole) ligands and metal ions. X-phot
oelectron spectrometric study of these complexes disclosed that due to
coordination the 2p bonding energies of the metal ions (M(2p)) are de
creased and the B. E. of N-Is is increased, During complexation, the d
irection of electron transfer is from the ligand to the metal ion (L--
>M); the coordination bonds formed are of sigma-type in character.