SYNTHESIS AND PHOTOSWITCHABLE COMPLEXATION EXTRACTION PROPERTIES OF LIPOPHILIC AZOBIS(BENZO-15-CROWN-5) IONOPHORES FOR ALKALI-METAL CATIONS/

Authors
ODASHIMA K TOHDA K YOSHIYAGAWA S YAMASHITA S KATAOKA M UMEZAWA Y
Citation
K. Odashima et al., SYNTHESIS AND PHOTOSWITCHABLE COMPLEXATION EXTRACTION PROPERTIES OF LIPOPHILIC AZOBIS(BENZO-15-CROWN-5) IONOPHORES FOR ALKALI-METAL CATIONS/, Heterocycles, 47(2), 1998, pp. 847-856
Citations number
26
Categorie Soggetti
Chemistry Inorganic & Nuclear
Journal title
Heterocycles → ACNP
ISSN journal
03855414
Volume
47
Issue
2
Year of publication
1998
Pages
847 - 856
Database
ISI
SICI code
0385-5414(1998)47:2<847:SAPCEP>2.0.ZU;2-N
Abstract
Novel lipophilic derivatives of azobis(benzo-15-crown-5) (1b, 1c) were synthesized and their photoisomerization, complexation and extraction properties for alkali metal cations were investigated. Upon UV light irradiation, the photostationary state of the trans and cis isomers wa s reached and, with both 1b and 1c, the extractabilities of Rb+ and Cs + increased due to the formation of 1:1 sandwich-type complexes by the cis isomers. On the other hand, the extractability of K+ decreased, p ossibly because the 2:1 complexes formed by the trans isomers are more stable and/or lipophilic than the complexes of the cis isomers.