Effect of substituents and encapsulation on the catalytic activity of copper(II) complexes of two tridentate Schiff base ligands based on thiophene: benzyl alcohol and phenol oxidation reactions

• Published in: Transition metal chemistry (Weinheim) Vol. 39; no. 4; pp. 431 - 442
• Main Authors: Mobinikhaledi, Akbar, Zendehdel, Mojgan, Safari, Parvin
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01-05-2014; Springer Nature B.V
• Subjects: Catalysis; Chemistry; Chemistry and Materials Science; Inorganic Chemistry; Organometallic Chemistry; Physical Chemistry; TBHP; Zeolite; Benzyl Alcohol; Schiff Base Ligand; Zeolite Framework
• ISSN: 0340-4285; 1572-901X
• DOI: 10.1007/s11243-014-9817-x

Encapsulation of Cu(II) complexes of methyl-2-(2-hydroxybenzylideneamino)-4,5,6,7-tetrahydrobenzo[b]-thiophene-3-carboxylate (HL
1
) and 2-ethyl-4-methyl 5-(2-hydroxybenzylideneamino)-3-methylthiophene-2,4-dicarboxylate (HL
2
) in the supercages of zeolite NaY was performed by the flexible ligand method. The neat and encapsulated complexes were characterized by physicochemical and spectroscopic methods and employed as catalysts for oxidation of benzyl alcohol and phenol. The encapsulated complexes were both more reactive and stable as catalysts than the corresponding free complexes. The encapsulated complexes could be reused several times. Complexes of HL
2
were more reactive than those of HL
1
, probably due to the electron-withdrawing effect of the CO
2
Et group.