FLUOROIONOPHORES WITH PHENANTHRIDINYL UNITS

Novel fluoroionophores bearing two (1) and one (2) fluorophoric6-phena nthridinyl units attached by a short methylene spacer onto nitrogen at oms of 7,16-diaza- and aza-l8-crown-6 rings have been prepared in high yields. The fluoroionophores exhibited the ability to signal binding of certain metal cations through the specific complexation induced shi fts (CIS) of phenanthridine protons in H-1 NMR spectra as well as by t he large intensity enhancements in fluorescence spectra. The X-ray str ucture analysis of [1, K+(C2H4Cl2)] picrate complex revealed that K+ i s nine-coordinated, using all donors from the diazacrown ring, one chl orine atom from 1,2-dichloroethane solvent molecule and both nitrogen donors from syn-oriented phenanthridine units.