The complexes formed between BH3 and 1,3-ambident anions ([CH2CHO]-, [CH2CHNH]-) have been studied by the MNDO SCF method. The heat of the reaction depended on the nature of the complexing atoms. The 1-carbon-BH3 complex is more stable than 3-oxygen-BH3 or 3-nitrogen-BH3 complexes. The order of complexing action is different from that of electrostatic interaction, but is the same as the order of covalent interaction.

Key words: QUANTUM CHEMISTRY, ELECTRON TRANSFER, ANION, FORMATION HEAT, BORANES, MOLECULAR ORBITAL THEORY, SELF-CONSISTENT FIELD, COORDINATE CHEMISTRY, LIGAND FIELD THEORY, SEMIEMPIRICAL EQUATIONS