Structure-selective recognition by voltammetry: Enantiomeric determination of amines using azophenolic crowns in aprotic solvent

Kyungmin Chun, Tae Hyun Kim, One-Sun Lee, Keiji Hirose, Taek Dong Chung, Doo Soo Chung, Hasuck Kim

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The enantiomeric recognition of amines by voltammetry using electroactive macrocyclic molecules, nitroazophenolic crown ethers, is repotted. The oxidation potential of the nitroazophenol moiety in nitroazophenols with 18-crown-6 sensitively depends on the structure of alkyl amines. Based on this phenomenon, enantiomeric amines and even the quantitative assay of the R/S ratio in enantiomeric mixtures can be selectively recognized by using 18-crown-6 azophenol (3-H) with chiral centers. In the case of phenylglycinol, the association constants (K) of 3-H for the R and S forms have an R/S value of 3.5. The peak potential of the R form in square-wave voltammograms reproducibly differs from that of the S form by 32 mV, within which the peak potential linearly varies with the enantiomeric ratio. Free energy perturbation and molecular dynamics simulation provide deeper understanding of the enantiomeric recognition in this system. The theoretical analysis indicates that the free energy difference between diastereomeric complexes agrees well with the experimental results, and the π-π or charge-charge interaction plays a key role in enantiomeric recognition.

Original languageEnglish
Pages (from-to)7597-7600
Number of pages4
JournalAnalytical Chemistry
Volume78
Issue number21
DOIs
Publication statusPublished - 1 Nov 2006
Externally publishedYes

Fingerprint

Voltammetry
Crowns
Amines
Free energy
Crown Ethers
Molecular Dynamics Simulation
Molecular dynamics
Assays
Association reactions
Oxidation
Molecules
Computer simulation
18-crown-6

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Structure-selective recognition by voltammetry : Enantiomeric determination of amines using azophenolic crowns in aprotic solvent. / Chun, Kyungmin; Kim, Tae Hyun; Lee, One-Sun; Hirose, Keiji; Chung, Taek Dong; Chung, Doo Soo; Kim, Hasuck.

In: Analytical Chemistry, Vol. 78, No. 21, 01.11.2006, p. 7597-7600.

Research output: Contribution to journalArticle

Chun, Kyungmin ; Kim, Tae Hyun ; Lee, One-Sun ; Hirose, Keiji ; Chung, Taek Dong ; Chung, Doo Soo ; Kim, Hasuck. / Structure-selective recognition by voltammetry : Enantiomeric determination of amines using azophenolic crowns in aprotic solvent. In: Analytical Chemistry. 2006 ; Vol. 78, No. 21. pp. 7597-7600.
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