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A New On-fluorescent Probe for Manganese (II) Ion

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Abstract

A new fluorescent probe for Mn2+ ion, (6E)-N-((E)-1,2-diphenyl-2-(pyridin-2-ylimino)ethylidene)pyridin-2-amine (L), has been synthesized from benzil and 2-amino pyridine and characterized. In 1:1 (v/v) CH3CN:H2O (pH 4.0, universal buffer) L exhibits fluorescent intensity with emission peak at λmax 360 nm on excitation with photons of 310 nm. Fluorescent intensity of L increases distinguishingly on interaction with Mn2+ ion compared to metal ions—Na+, K+, Ca2+, Mg2+, Ba2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+, Pb2+ and Ag+ individually or all together. The enhancement in fluorescent intensity is due to snapping of photoinduced electron transfer (PET) prevailed in free L. Fluorescence and UV/visible spectral data analysis shows that binding stoichiometry between Mn2+ and L is 1:1 with log β ≈ 3.0. Both L and its Mn2+ complex were optimised using density functional theory (DFT) and vibrational frequency calculations confirm that both are at local minima on the potential energy surfaces.

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Acknowledgment

Department of Science & Technology, New Delhi and University Grants Commission (SAP), New Delhi are thanked for financial help.

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Authors and Affiliations

  1. Department of Chemistry, Gauhati University, Guwahati, 781014, Assam, India

    Kaku Dutta & Diganta Kumar Das

  2. Department of Chemical Sciences, Tezpur University, Napaam, Tezpur, 784 028, Assam, India

    Ramesh Ch. Deka

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  1. Kaku Dutta
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  2. Ramesh Ch. Deka
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  3. Diganta Kumar Das
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Correspondence to Diganta Kumar Das.

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Dutta, K., Deka, R.C. & Das, D.K. A New On-fluorescent Probe for Manganese (II) Ion. J Fluoresc 23, 1173–1178 (2013). https://doi.org/10.1007/s10895-013-1248-0

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  • DOI: https://doi.org/10.1007/s10895-013-1248-0

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