Studies on metal-ion complex formation of crown ether derivatives incorporating a photoionizable spirobenzopyran moiety by electrospray ionization mass spectrometry
K. Kimura et al., Studies on metal-ion complex formation of crown ether derivatives incorporating a photoionizable spirobenzopyran moiety by electrospray ionization mass spectrometry, ANALYST, 125(6), 2000, pp. 1091-1095
Metal-ion complexation of crown ether derivatives incorporating one and two
spirobenzopyran units was investigated by electrospray ionization mass spe
ctrometry. The crowned spirobenzopyran derivatives exhibited very different
metal ion-complexing behavior from their corresponding parent crown ether
rings, preferring multivalent to monovalent metal ions owing to the additio
nal ionic interaction with the nitrophenolate anion of the merocyanine moie
ty. The on-line photochemical reaction for mass spectrometry indicated that
the metal ion-complexing ability and ion selectivities of the crowned spir
obenzopyrans can be switched photochemically, taking advantage of the diffe
rence between the spiropyran and merocyanine isomers.