Synthesis and Fluorescence Spectra of Oxa[3.n]phenanthrenophanes
摘要:
Novel photostable oxa[3.n](3,9)- and (3.3](3,10)phenanthrenophanes (n = 3, 4) bearing trimethylene-type linkage(s) were successfully synthesized by the intramolecular acid-catalyzed etherification of the corresponding precursor diols. syn-Oxa[3.3](3,10)phenanthrenophane afforded the most red-shifted excimer fluorescence (lambda(max) = 432 nm) among the phenanthrenophanes so far prepared.
Synthesis and fluorescence emission behavior of novel anti-[2.n](3,9)phenanthrenophanes
摘要:
Novel syn- and anti-[2.n](3,9)phenanthrenophanes (n=3,4) were successfully prepared by the intramolecular [2+2] photocycloaddition of alpha,omega-bis(3-vinyl-9-phenanthryl)alkanes. The anti-isomer of n=3 was found to give excimer fluorescence in spite of the only partially overlapping phenanthrene rings, although that of n=4 gave monomer fluorescence. (C) 2000 Elsevier Science Ltd. All rights reserved.