216243-24-2

Upstream product

• 5186-27-6 6-formyl-5,7-dihydroxy-2-methylbenzopyran-4-one 
• 62-53-3 aniline 

Downstream Products

• 226945-85-3 Th₂(C₁₇H₁₁NO₄)(OH)6(C₂H₅OH)2 
• 226945-31-9 Ce(C₁₇H₁₂NO₄)2Cl(H₂O)*H₂O 

Relevant academic research and scientific papers

Chelation behaviour of CE(III), Th(IV), and UO2(VI) with 5,7-dihydroxy-6-formyl-2-methylbenzopyran-4-one Schiff bases

The stability constants of the stepwise chelate formation between Ce3+, Th4+, and UO,2+2 ions and some Schiff bases derived from 5,7-dihydroxy-6-formyl-2-methylbenzopyran-4-one were determined conductometrically as well as potentiometrically applying the Irving and Rossotti techniques. The results indicate the formation of 1:1 and 1:2 (M:L) chelates. The stability constants increase with decreasing ionic strength, decreasing temperature, and decreasing percentage of ethanol. In different organic solvents (70% v/v solvent-water media), the stability constant values follow the order MeOH EtOH 1-propanol 2-propanol acetone DMSO depending on both the dielectric constant and the hydrogen bonding structure of the medium. The thermodynamic parameters (ΔG, ΔH, and ΔS) were calculated; they indicate that the chelate formation is an exothermic process and that the degree of disorder of the solution increases upon chelation.