title: Synthesis and chemosensitivity of a new iminium salt toward a cyanide anion.
abstract: A short, high-yielding route to pyranylidene Iminium (Imi) salts using a new pyrylium salt reaction between N,N-Dimethylformamide (DMF) and acetic anhydride is reported. The Imi salt-sensing behavior toward various anions has been investigated using UV-Visible spectroscopy. The Imi salt demonstrates high selectively for CN(-) when various other anions, such as CN(-), Cl(-), Br(-), I(-), SCN(-), ClO4(-), NO3(-), HSO4(-), PF6(-) and N3(-), are present because it is highly reactive towards nucleophiles. The selective detection of CN(-) with the Imi unit gave rise to a significant hypochromic shift in the CH3CN solution at λmax=444nm and 423nm and creation of new peak at 252nm. These studies indicated that CN(-) had high affinity toward Imi, forming a 1:1 complex; this observation agrees with the current understanding of these materials.
authors.affiliation: Department of Advanced Organic Materials Science and Engineering, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon 305-764, South Korea.
authors.forename: Boddu Ananda
authors.initials: BA
authors.lastname: Rao
authors.affiliation: Department of Advanced Organic Materials Science and Engineering, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon 305-764, South Korea.
authors.forename: Jae-Young
authors.initials: JY
authors.lastname: Lee
authors.affiliation: Department of Advanced Organic Materials Science and Engineering, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon 305-764, South Korea. Electronic address: yason@cnu.ac.kr.
authors.forename: Young-A
authors.initials: YA
authors.lastname: Son
mesh_terms: D000838:Anions; D003486:Cyanides / Q000737:chemistry*; D006575:Heterocyclic Compounds, 3-Ring / Q000138:chemical synthesis* / Q000737:chemistry*; D015394:Molecular Structure
chemical_list: D000838:Anions; D003486:Cyanides; D006575:Heterocyclic Compounds, 3-Ring
keywords: Chemosensor; Cyanide ion sensing; Nucleophilic additions; Pyranylideneiminium salt; Pyrylium trifluoromethanesulfonate