Syntheses and structures of new blue luminescent B(III) and Al(III) complexes: BPh2(acac-azain) and Al(CH3) (acac-azain)(2), acac-azain=1-N-7-azaindolyl-1,3-butanedionato

A novel blue luminescent ligand, 1-N-7-azaindolyl-1,3-butanedione (acac-aza inH), has been synthesized and characterized structurally. The acac-azainH has a diketone structure in the solid state. The diketone form of acac-azai nH is also dominant in solution. The acac-azainH molecule reacts readily wi th BPh3 and Al(CH3)(3) to form chelate complexes BPh2(acac-azain) (1) and A l(CH3)(acac-azain)(2) (2), respectively. The structure of 1 was determined by a single-crystal X-ray diffraction analysis. The acac-azainH molecule an d compounds 1 and 2 are all blue luminescent but the luminescent efficiency is poor. In solution, compound 2 appears to exist in two isomeric forms. ( C) 2001 Elsevier Science B.V. All rights reserved.