| Autor: |
Mondal B; Post Graduate Department of Chemistry, Ramakrishna Mission Vivekananda Centenary College, Rahara, Kolkata, West Bengal 700118, India., Manna P; Department of Chemistry, Jadavpur University, Jadavpur, Kolkata, West Bengal 700 032, India., Singha DK; Department of Chemistry, C. V. Raman Global University, Bhubaneswar, Odisha 752054, India., Majee P; Department of Chemistry, UPL University of Sustainable Technology, Vataria, Gujarat 393135, India., Azam S; Department of Chemistry, Siksha-Bhavana, Visva-Bharati University, Santiniketan, West Bengal 731235, India., Dutta S; Department of Chemistry, Siksha-Bhavana, Visva-Bharati University, Santiniketan, West Bengal 731235, India., Halder S; Post Graduate Department of Chemistry, Ramakrishna Mission Vivekananda Centenary College, Rahara, Kolkata, West Bengal 700118, India., Ghosh T; Post Graduate Department of Chemistry, Ramakrishna Mission Vivekananda Centenary College, Rahara, Kolkata, West Bengal 700118, India., Mondal SK; Department of Chemistry, Siksha-Bhavana, Visva-Bharati University, Santiniketan, West Bengal 731235, India., Mahata P; Department of Chemistry, Jadavpur University, Jadavpur, Kolkata, West Bengal 700 032, India. |
| Abstrakt: |
Two new dioxidovanadium(V) compounds with the general formula [V V O 2 (L)] (L = hydrazone ligand) were synthesized using three different methods (acidic, neutral, and basic media) with either V IV OSO 4 . 5H 2 O, [V IV O(acac) 2 ], or NH 4 V V O 3 as the starting material and hydrazone ligands. In both cases, five coordinated V 5+ ions adopted distorted square pyramidal geometry through the coordination of two oxido ligands and one hydrazone ligand. In compound 1 , the presence of free hydroxyl groups stabilized the molecular species through intramolecular O-H•••N type hydrogen bond interactions. In compound 2 , the free amino groups are involved in both intramolecular N-H•••N type and intermolecular N-H•••O type hydrogen bond interactions. Compound 1 showed highly selective luminescence turn-on behavior, along with a 33-nm blue shift in the presence of Al 3+ ions in an aqueous medium. The experimental limit of detection (LOD) was found to be 66 nM. Whereas compound 2 showed luminescence quenching behavior in the presence of Fe 3+ , Al 3+ , and Cr 3+ ions. The LODs were observed to be 312, 408, and 280 nM for Fe 3+ , Al 3+ , and Cr 3+ ions, respectively. The luminescence response mechanisms of both compounds in the presence of metal ions have been correlated with molecular-level interactions. |
