Single sensors for multiple analytes employing fluorometric differentiation for Cr3+ and Al3+ in semi-aqueous medium with bio-activity and theoretical aspects

Malay Dolai; Urmila Saha; Avijit Kumar Das; Gopinatha Suresh Kumar

doi:10.1039/C8AY01080C

Single sensors for multiple analytes employing fluorometric differentiation for Cr³⁺ and Al³⁺ in semi-aqueous medium with bio-activity and theoretical aspects†

Malay Dolai,

*^a Urmila Saha,

^b Avijit Kumar Das

*^cd and Gopinatha Suresh Kumar

Author affiliations

* Corresponding authors

^a Department of Chemistry, Prabhat Kumar College, Purba Medinipur 721401, India
E-mail: dolaimalay@yahoo.in, dolaimalay@gmail.com

^b Biophysical Chemistry Laboratory, Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S.C. Mullick Road, Kolkata 700 032, India

^c Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah-711 103, India
E-mail: sanjuavi.das@gmail.com

^d University of Siegen, Organic Chemistry, Adolf-Reichwein-Str. 2, D-57068 Siegen, Germany

Abstract

The structurally characterized (through single crystal X-ray diffraction) Schiff base ligand N,N′-bis(4-methoxy-salicylaldehyde)azine (H₂SALNN) exhibits poor fluorescence in the excited state, due to rotational (cis/trans) isomerization along the azomethine group. However, in the presence of Cr³⁺ and Al³⁺ the isomerization is blocked due to coordination with the metal ions exhibiting turn-on fluorescence. The fluorescence enhancement for Al³⁺ and Cr³⁺ at two distinct wavelengths shows much difference of the wavelengths (ΔI = 63 nm). Thus, the selective turn-on fluorescence behaviour of H₂SALNN for Cr³⁺ and Al³⁺ is based on the blocking effect of C [double bond, length as m-dash] N isomerization and chelation-enhanced fluorescence (CHEF). The coordination modes of the complexes were investigated by spectroscopic and computational studies.

Supplementary files

Article information

DOI: https://doi.org/10.1039/C8AY01080C
Article type: Paper
Submitted: 13 May 2018
Accepted: 09 Jul 2018
First published: 10 Jul 2018

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Anal. Methods, 2018,10, 4063-4072

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Single sensors for multiple analytes employing fluorometric differentiation for Cr³⁺ and Al³⁺ in semi-aqueous medium with bio-activity and theoretical aspects

M. Dolai, U. Saha, A. K. Das and G. Suresh Kumar, Anal. Methods, 2018, 10, 4063 DOI: 10.1039/C8AY01080C

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Analytical Methods