Dinuclear terbium(III) complexes based on substituted aliphatic and aromatic acids derivatives: Synthesis and photophysical studies

A Tb3+ functionalized triazine-porous organic framework as a ratiometric fluorescent sensor for determination of ciprofloxacin in aquatic products

“…4a, after addition of ciprofloxacin into the Tb 3+ /TAPOF dispersed solution, four new emission peaks appeared respectively at 490, 544, 585 and 620 nm, and they were ascribed to the characteristic emission peaks of 5 D 4 -7 F 6 , 5 D 4 -7 F 5 , 5 D 4 -7 F 4 and 5 D 4 -7 F 3 of Tb 3+ , respectively. [29][30][31] The reason for the appearance of such new emission peaks lies in the antenna effect of Tb 3+ , that is, when ciprofloxacin was added to the Tb 3+ /TAPOF dispersion solution, the ciprofloxacin molecule would replace the water molecule in the empty coordination center of Tb 3+ and transfer the absorbed energy to Tb 3+ , thus stimulating the appearance of the characteristic emission peaks of Tb 3+ . 32 In addition, the degree of fluorescence intensity enhancement was proportional to the ciprofloxacin concentration, and the intensity of the peak at 544 nm increased most greatly, while the peak at 440 nm did not change.…”

Repurposed organoselenium tethered amidic acids as apoptosis inducers in melanoma cancer via P53, BAX, caspases-3, 6, 8, 9, BCL-2, MMP2, and MMP9 modulations

“…14 For instance, maleic and succinic anhydrides are frequently utilized for the synthesis of dicarboxamides and cyclic imides via reaction with amines. 15,16 The reaction typically involves a nucleophilic attack of the amine on the anhydride carbonyl (C]O) carbon, followed by ring opening and the formation of the corresponding amidic acid intermediates i.e., N-maleanilic and N-succinanilic carboxylic acid derivatives. 17,18 The latter is either subjected to further reaction with amines to furnish dicarboxamides or subsequent dehydration and intramolecular cyclization to give the corresponding cyclic imides (e.g., maleimides and succinimides).…”

“…14 For instance, maleic and succinic anhydrides are frequently utilized for the synthesis of dicarboxamides and cyclic imides via reaction with amines. 15,16 The reaction typically involves a nucleophilic attack of the amine on the anhydride carbonyl (CO) carbon, followed by ring opening and the formation of the corresponding amidic acid intermediates i.e. , N -maleanilic and N -succinanilic carboxylic acid derivatives.…”