Azocalix[4]arene with three distal ethyl ester residues as a highly selective chromogenic sensor for Ca2+ ions

作者：Wang, Jie; Guan, Hongyu^*; Ge, Chunhua; Fan, Ping^*; Xing, Xijuan; Shang, Yunshan

来源：Heterocyclic Communications, 2018, 24(3): 147-150.

DOI：10.1515/hc-2017-0239

• azocalix[4]arene
• calcium ion
• chromogenic sensor
• ion recognition

Three azocalix[4]arenes with distal ethyl ester residues, 5-phenylazo-25,26,27-tris[(ethoxycarbonyl methoxy] -28-hydroxycalix[4]arene (2), 5-(o-methylphenyl) azo-25,26,27-tris[(ethoxycarbonyl)methoxy]-28-hydroxycalix[4]arene (3), 5-(p-Methylphenyl)azo-25,26,27-tris-[(ethoxycarbonyl)methoxy]-28-hydroxycalix[4]arene (4), were synthesized and their binding properties with metal ions were investigated by ultraviolet (UV)/visible spectroscopy. The chromogenic behavior of these compounds upon metal ion complexation indicates a specific selectivity toward Ca2+ ion in the presence of other cations tested. The stoichiometry of 3 to Ca2+ ion in the complex is 1:1 and the stability constant of the complex is 1.28 x 10(4) m(-1).

• 出版日期2018-6
• 单位辽宁大学