Synthesis of Indeno[2′,1′:5,6]pyrido[2,3‐ d ]pyrimidine Derivatives and Their Recognition Properties as New Type Anion Receptors

A new type anion receptors containing indeno[2′,1′:5,6]pyrido[2,3‐ d ]pyrimidine have been synthesized via three‐component reaction of aldehyde, 6‐aminopyrimidine‐2,4‐dione, and 1,3‐indanedione in aqueous media. The binding properties of the receptors with anions such as F − , Cl − , Br − , AcO − , HSO 4 − , and H 2 PO 4 − have been investigated by UV–vis spectroscopy methods. The results have shown that receptors have good selectivity to F − and AcO − , and a 1:1 stoichiometry complex has been formed between compounds and anions.