Dy(III) complexes of metformin Schiff-bases as glucose probe: synthesis,spectral, and thermal properties |
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| Authors: | Marwa A Mahmoud Enas T Abdel-Salam Nadia F Abdel Aal Zeinab M Showery |
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| Institution: | 1. Department of Science and Mathematics Engineering, Faculty of Petroleum and Mining Engineering, Suez University, Suez, Egypt;2. Department of Chemistry, Faculty of Science, Suez Canal University, Ismailia, Egypt;3. Holding Company for Water &4. Wastewater, Ismailia, Egypt |
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| Abstract: | Complexes of Dy3+ with metformin-Schiff-bases of salicylaldehyde (HL1); 2,3-dihydroxybenzaldehyde (H2L2); 2,4-dihydroxybenzaldehyde (H2L3); 2,5-dihydroxybenzaldehyde (H2L4); 3,4-dihydroxybenzaldehyde (H2L5); and 2-hydroxynaphthaldehyde (HL6) were synthesized by template reactions. The new compounds were characterized through elemental analysis, conductivity and magnetic moment measurements, IR, UV–vis, fluorescence, GC–MS, and XRD spectroscopies. The complexes are seven coordinate with formulas DyL1–4,6(NO3)2(H2O)2]·nH2O where n?=?2, 2½, 4, 2, 2 and DyL5(NO3)(H2O)4]·2H2O. TGA, DTG, and DTA analyses confirmed the suggested stereochemistry and subsequently the proposed mechanism of thermal decomposition. Kinetic and thermodynamic parameters were calculated for the second decomposition step. Thus, we report the ability of using the prepared complexes in the detection of glucose at physiological conditions using UV–vis and fluorescence spectroscopy as well as viscosity measurements, where the association constants were calculated. 
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| Keywords: | Metformin Schiff-bases Dy3+ complexes spectral and thermal properties glucose probe |
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