Boron complexes with Chelating anilido-imine ligands: Synthesis, structures and luminescent properties

Three new boron complexes with anilido-imine ligands, ortho-C6H4(NAr1)(CH=NAr2)BF2 [Ar-1 = 2,6-Et2C6H3, Ar-2 = p-MeC6H4 (3a); Ar-1 = 2,6-iPr(2)C(6)H(3), Ar-2 = p-MeC6H4 (3b); Ar-1 = 2,6-iPr(2)C(6)H(3), Ar-2 = 2,6-Me2C6H3 (3c)] were synthesized by the reaction of BF3(OEt2) with the lithium salt of the corresponding ligands. All complexes were characterized by H-1, B-11, C-13 and F-19 NMR spectroscopy, elemental analyses and mass spectrometry. The molecular structures of complexes 3a-3c were determined by X-ray crystallography. DSC analysis of 3a-3c demonstrates their good thermal stability. Luminescent properties of the ligands and the complexes 3a-3c in solution and the solid state were studied. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheirn, Germany, 2007).