TY - JOUR
T1 - Synthesis and cations complexation of dumbbell shaped biscalix[4]-1,3-aza- crown with rigid thiourea-bridge
AU - Yang, Fafu
AU - Wang, Yanhua
AU - Hong, Biqiong
AU - Chai, Xianfeng
PY - 2009/6
Y1 - 2009/6
N2 - By reacting calix[4]-1,3-aza-crown 2 with 1,4-phenyl diisothiocyanate in "1 + 2" condensation mode, the novel dumbbell shaped biscalix[4]-1,3-aza-crown 3 with rigid thiourea-bridge was conveniently prepared in yield of 85%. Its structure and conformation were characterized by elemental analyses, ESI-MS, 1H NMR and 1H-1H COSY techniques. The complexation properties of compound 3 were investigated by liquid-liquid extraction experiments and 1H NMR titration experiments. The results showed that compound 3 has excellent complexation abilities for soft cations and outstanding extraction selectivity for Ag +. The Ag+/Na+ and Ag+/Hg 2+ extraction percentage of host 7 were as high as 43.2 and 16.9, respectively. 1H NMR titration experiments revealed the 1:2 stoichiometry of receptor 3-Ag+ complex was formed.
AB - By reacting calix[4]-1,3-aza-crown 2 with 1,4-phenyl diisothiocyanate in "1 + 2" condensation mode, the novel dumbbell shaped biscalix[4]-1,3-aza-crown 3 with rigid thiourea-bridge was conveniently prepared in yield of 85%. Its structure and conformation were characterized by elemental analyses, ESI-MS, 1H NMR and 1H-1H COSY techniques. The complexation properties of compound 3 were investigated by liquid-liquid extraction experiments and 1H NMR titration experiments. The results showed that compound 3 has excellent complexation abilities for soft cations and outstanding extraction selectivity for Ag +. The Ag+/Na+ and Ag+/Hg 2+ extraction percentage of host 7 were as high as 43.2 and 16.9, respectively. 1H NMR titration experiments revealed the 1:2 stoichiometry of receptor 3-Ag+ complex was formed.
KW - Ag
KW - Biscalix[4]crown
KW - Complexation
KW - Dumbbell
KW - Thiourea
UR - http://www.scopus.com/inward/record.url?scp=67349173201&partnerID=8YFLogxK
U2 - 10.1007/s10847-009-9537-6
DO - 10.1007/s10847-009-9537-6
M3 - Article
AN - SCOPUS:67349173201
SN - 0923-0750
VL - 64
SP - 67
EP - 72
JO - Journal of Inclusion Phenomena and Macrocyclic Chemistry
JF - Journal of Inclusion Phenomena and Macrocyclic Chemistry
IS - 1-2
ER -