title: Synthesis and properties of annulated 2-(Azaar-2-yl)- and 2,2'-Di(azaar-2-yl)-9,9'-spirobifluorenes.
abstract: A series of 9,9'-spirobifluorene-derived N-heterocycles were prepared by the reactions of 8,9-dihydrospiro(benzo[b]fluorene-11,9'-fluoren)-6(7H)-one and 8,8',9,9'-tetrahydro-11,11'-spirobi(benzo[b]fluorene)-6,6'(7H,7'H)-dione with a series of 2-amino-arenecarbaldehydes such as 2-aminobenzaldehyde, 2-aminonicotinealdehyde, 1-amino-2-naphthaldehyde, and 8-aminoquinoline-7-carbaldehyde. In addition to the absorption maxima based on the parent 9,9'-spirobifluorene skeleton in the 225-234, 239-280, 296-298, and 308-328 nm regions, the absorptions due to the π-π* transitions of the heterocycles were observed in the 351-375 nm region in the UV absorption spectra. All the compounds showed strong photoluminescences in the 390-430 nm region.
authors.affiliation: College of Pharmacy, Yeungnam University, Gyeongsan 712-749, Korea. ydjahng@ynu.ac.kr.
authors.forename: Jing Lu
authors.initials: JL
authors.lastname: Liang
authors.forename: Hyochang
authors.initials: H
authors.lastname: Cha
authors.forename: Yurngdong
authors.initials: Y
authors.lastname: Jahng
mesh_terms: D002152:Calorimetry, Differential Scanning; D015394:Molecular Structure; D009287:Naphthyridines / Q000737:chemistry*; D010618:Phenanthrolines / Q000737:chemistry; D011804:Quinolines / Q000737:chemistry*
chemical_list: D009287:Naphthyridines; D010618:Phenanthrolines; D011804:Quinolines; C025205:1,10-phenanthroline