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Template Synthesis, Spectral, Thermal and Glucose Sensing of Pr 3+ Complexes of Metformin Schiff-Bases.
Journal of Fluorescence 2019 January 17
Schiff-bases of metformin with each of salicylaldehyde (HL1 ); 2,3-dihydroxybenzaldehyde (H2 L2 ); 2,4-dihydroxybenzaldehyde (H2 L3 ); 2,5-dihydroxybenzaldehyde (H2 L4 ); 3,4-dihydroxybenzaldehyde (H2 L5 ) and 2-hydroxynaphthaldehyde (HL6 ) and their complexes with Pr(III) were synthesized by template reaction. The complexes were characterized through elemental analysis, conductivity and magnetic moment measurements, IR, UV-Vis., fluorescence, GC-MS and XRD spectroscopy. The complexes exhibit a series of characteristic emission bands for Pr3+ ion in the 481-472 and 590-580 nm range with a 318-332 nm excitation source. The complexes have eight coordinated structure with the formulae [PrL1-4,6 (NO3 )2 (H2 O)3 ].nH2 O where n = 1, 1½, 3, 4, 4 and [PrL5 (NO3 )(H2 O)5 ].2H2 O. The suggested stereochemistry was confirmed using TGA, DTG and DTA analysis and a mechanism for thermal decomposition was proposed. Coates-Redfern equation was used to calculate kinetic and thermodynamic parameters of the main decomposition step. The utility of the complexes towards the detection of glucose at physiologically relevant pH in phosphate buffer using UV-Vis and fluorescence spectroscopy as well as viscosity measurements are tried where the association constants were calculated. Graphical Abstract ᅟ.
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