@article{oai:kansai-u.repo.nii.ac.jp:00011440,
 author = {Kimura, Keiichi and Sakamoto, Hidefumi and Kado, Shinpei and Arakawa, Ryuichi and Yokoyama, Masaaki},
 journal = {Analyst},
 month = {May},
 note = {Metal-ion complexation of crown ether derivatives incorporating one and two spirobenzopyran units was investigated by electrospray ionization mass spectrometry.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 additional ionic interaction with the nitrophenolate anion of the merocyanine moiety.The on-line photochemical reaction for mass spectrometry indicated that the metal ion-complexing ability and ion selectivities of the crowned spirobenzopyrans can be switched photochemically,taking advantage of the difference between the spiropyran and merocyanine isomers.},
 pages = {1091--1095},
 title = {Studies on metal-ion complex formation of crown ether derivatives incorporating a photoionizable spirobenzopyran moiety by electrospray ionization mass spectrometry},
 volume = {125},
 year = {2000}
}