Dy(III) complexes of metformin Schiff-bases as glucose probe: synthesis, spectral and thermal properties
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Complexes of Dy<sup>3+</sup> with metformin-Schiff-bases of salicylaldehyde (HL<sup>1</sup>); 2,3-dihydroxybenzaldehyde (H<sub>2</sub>L<sup>2</sup>); 2,4-dihydroxybenzaldehyde (H<sub>2</sub>L<sup>3</sup>); 2,5-dihydroxybenzaldehyde (H<sub>2</sub>L<sup>4</sup>); 3,4-dihydroxybenzaldehyde (H<sub>2</sub>L<sup>5</sup>); and 2-hydroxynaphthaldehyde (HL<sup>6</sup>) 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 DyL<sup>1,4,6</sup>(NO<sub>3</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]·nH<sub>2</sub>O where n = 2, 2½, 4, 2, 2 and [DyL<sup>5</sup>(NO<sub>3</sub>)(H<sub>2</sub>O)<sub>4</sub>]·2H<sub>2</sub>O. 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 steps. 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.
提供机构：
Taylor & Francis
创建时间：
2019-01-17
