Cation recognition of luminescent ionophore-dansyl-monoaza-18-crown-6

Citation
Ld. Li et al., Cation recognition of luminescent ionophore-dansyl-monoaza-18-crown-6, CHEM J CH U, 22(9), 2001, pp. 1472-1476
Citations number
14
Language
CHINESE
art.tipo
Article
Categorie Soggetti
Chemistry
Journal title
CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
ISSN journal
0251-0790 → ACNP
Volume
22
Issue
9
Year of publication
2001
Pages
1472 - 1476
Database
ISI
SICI code
0251-0790(200109)22:9<1472:CROLI>2.0.ZU;2-Q
Abstract
Using the title ionophore DNS-MAC(O-5) as the host, its cation recognition properties for Li+, Na+, K+, Mg2+, Ba2+ and Pb2+ in acetonitrile and in aqu eous solution were studied by fluorescence and NP-RTP method, respectively. The corresponding stability constants and the recognition sensitive factor s for the host-guest complexes were determined. The results proved that the charge of guest cation and the spatial matching requirement between azacro wn ring and the cation are the two most important factors on the recognitio n process. DNS-MAC(O-5) undergoes obviously a spectral change upon binding with cation. These changes are mainly controlled by the charge density of t he cation. When the azacrown ether moiety of the ionophore was coordinated with a cation, not only the dipole moment of the lumino-ionophore was incre ased, but also it was more favorable for the photoinduced intramolecular ch arge transfer, so the stability of exited state was increased and the fluor escence spectrum was red shifted. At the same time, the relative fluorescen ce quantum of DNS-MAC(O-5) in water and acetonitrile was determined by the comparative method in this paper.