226945-16-0

Upstream product

• 5186-27-6 6-formyl-5,7-dihydroxy-2-methylbenzopyran-4-one 
• 95-85-2 2-hydroxy-5-chloro-aniline 

Downstream Products

• 226945-69-3 Ce(C₁₇H₉NO₅Cl)(H₂O)3(C₂H₅OH) 
• 226945-92-2 Th(C₁₇H₉NO₅Cl)(OH)(H₂O)2(C₂H₅OH) 
• 763068-90-2 UO₂(C₁₇H₁₀NO₅Cl)(H₂O)2(C₂H₅OH)2 

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.