title: The photo- and electrophysical properties of curcumin in aqueous solution.
abstract: An investigation of the photo- and electrophysical properties of curcumin (1,7-bis[4-hydroxy-3-methoxyphenyl]-1,6-heptadiene-3,5-dione) revealed well-defined color changes upon the addition of Hg(2+) or OH(-). Curcumin exhibited high selectivity for Hg(2+) ions, as compared with Cu(2+), Fe(2+), Fe(3+), Zn(2+), Na(+) and Ni(2+) ions in DMSO/H(2)O (5:1, v/v) which was attributed to the formation of a 4:1 Hg(2+)-curcumin coordination complex. Spectral responses at lambda(max)=434nm revealed that curcumin can function as a NOR logic gate with OH(-) and Hg(2+) as input variables. The electrochromic properties of curcumin were studied using an ITO/curcumin-Bu(4)NClO(4)/ITO cell. The electrochromic cell colored red at 3V, but changed to yellow in open-circuit condition.
authors.affiliation: Department of Textile System Engineering, Kyungpook National University, Daegu 702-701, South Korea. shokim@knu.ac.kr
authors.forename: Sung-Hoon
authors.initials: SH
authors.lastname: Kim
authors.forename: Seon-Yeong
authors.initials: SY
authors.lastname: Gwon
authors.forename: S M
authors.initials: SM
authors.lastname: Burkinshaw
authors.forename: Young-A
authors.initials: YA
authors.lastname: Son
mesh_terms: D002413:Cations, Divalent / Q000032:analysis; D003474:Curcumin / Q000737:chemistry*; D004563:Electrochemistry; D008628:Mercury / Q000032:analysis*; D010777:Photochemistry; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D014867:Water / Q000737:chemistry
chemical_list: D002413:Cations, Divalent; D014867:Water; D008628:Mercury; D003474:Curcumin