Abstract
A new vic-dioxime 6,7-bis(hydroxyimino)-9,10-diethylidine-5,8,9,10,11,18-hexahydro-5,8,11,18-tetraazadibenzo[a,e]cyclotetradecane-6,7,12,17-tetraone (H2L) and its hydrogen-bridged tetra- and six-coordinate complexes with Ni(II), Co(II), and Co(III) have been synthesized. The six-coordinate complexes of H2L have pyridine and chloride as axial ligands. Hydrogen-bridge complexes were converted to their BF2-bridged analogues by reaction with boron trifluoride etherate. Structures of the H2L and its complexes were proposed from elemental analysis, 1H and 13C NMR, IR and mass spectra.