Jump to main content
Jump to site search

Issue 35, 2012
Previous Article Next Article

Ratiometric fluorescence off-on-off sensor for Cu2+ in aqueous buffer by a lower rim triazole linked benzimidazole conjugate of calix[4]arene

Author affiliations

Abstract

A benzimidazole appended triazole linked 1,3-diconjugate of calix[4]arene (L) has been synthesized and characterized. The conjugate L has been found to recognize Cu2+ among the thirteen different metal ions studied by exhibiting ratiometric fluorescence changes through newly generated excimer band at ∼380 nm. Fluorescence offonoff behavior has been clearly demonstrated on the basis of the binding variability of Cu2+ to L. The binding has been elicited through the changes observed in the fluorescence, ESI MS and 1H NMR titrations. All the other metal ions studied do not show any new band and further do not interfere with the recognition of Cu2+ by L, even when these are present in the same medium. The structural features of both the mono- and di-nuclear complexes were established by DFT computational calculations and found to display highly distorted geometry about the copper centers that deviate from both the tetrahedral and the square planar.

Graphical abstract: Ratiometric fluorescence off-on-off sensor for Cu2+ in aqueous buffer by a lower rim triazole linked benzimidazole conjugate of calix[4]arene

Back to tab navigation

Supplementary files

Publication details

The article was received on 22 Feb 2012, accepted on 19 Jun 2012 and first published on 19 Jun 2012


Article type: Paper
DOI: 10.1039/C2DT30432E
Citation: Dalton Trans., 2012,41, 10652-10660
  •   Request permissions

    Ratiometric fluorescence off-on-off sensor for Cu2+ in aqueous buffer by a lower rim triazole linked benzimidazole conjugate of calix[4]arene

    R. K. Pathak, V. K. Hinge, P. Mondal and C. P. Rao, Dalton Trans., 2012, 41, 10652
    DOI: 10.1039/C2DT30432E

Search articles by author

Spotlight

Advertisements