The functionality of the hybrid systems driven by molecular dimension of the guest copper Schiff‐base complexes entrapped in Zeolite‐Y

Abstract

On encapsulation inside the supercage of zeolite‐Y planar Cu (II)–Schiff base complexes show the modified structural, optical and functional properties. The electronic effect of the different substituent groups present in the catalyst plays the decisive role towards their reactivity in the homogeneous phase but after the encapsulation in zeolite Y, reactivity is mainly governed by the molecular dimensions of the guest complexes rather than the electronic factor of the substituent groups attached on them. These systems are well characterized with the help of different characterization tools like XRD analysis, SEM ‐ EDX, AAS, FTIR, XPS, DSC, TGA, BET and UV–Visible spectroscopy and the comparative optical and catalytic studies have provided a rational explanation of enhanced reactivity of zeolite encapsulated metal complexes for various oxidation reactions compared to their corresponding solution states.

Zeolite-encapsulated copper(ii) complexes with NNO-tridentate Schiff base ligands: catalytic activity for methylene blue (MB) degradation under near neutral conditions

“…The binding energies of Cu (2p 3/2 ) and Cu (2p 1/2 ) validate that the copper metals are in a +2 oxidation state in all complexes. 35 The XPS signals of Cu are present at 933.93 eV (Cu2p 1/2 ) and 953.94 eV (Cu2p 3/2 ) for L 1 Cu(OAc). However, for L 1 Cu(OAc)-Y, L 2 Cu(OAc)-Y, and L 3 Cu(OAc)-Y, the signal peaks are observed at 935.09, 955.07, 935.68, 955.63, 935.16, and 955.07 eV, respectively.…”

“…The order of catalytic performance for encapsulated complexes is as follows: L 3 Cu(OAc)-Y > L 1 Cu(OAc)-Y > L 2 Cu(OAc)-Y. 34,35 Moreover, there was an obvious blueshift of the d-d transition in the UV-Vis spectrum as compared with free complexes, and the order of the blueshift is: L 3 Cu(OAc)-Y > L 1 Cu (OAc)-Y > L 2 Cu(OAc)-Y. For L 2 Cu(OAc)-Y, the shift is less than that of L 1 Cu(OAc)-Y and L 3 Cu(OAc)-Y.…”

“…The electronic effect from the ligand and the constraint from the zeolite contributed to the modified catalytic activity. 35…”

“…Previous studies have demonstrated that the reactivity is controlled by the host of zeolite in tandem with geometric and electronic structures of guest complexes, which change the substitutions of phenyl. 21,24,35,37,38 Hence, it is fascinating to construct novel complexes by altering ligands, and then research the relationship between geometry and reactivity for free and encapsulated complexes.…”

Characterization of a Zeolite-Y-Encapsulated Zn(II)Salmphen Complex with Targeted Anticancer Property

“…Due to their structural properties, biocompatibility, and stability in biological environments, these porous materials have numerous applications in biology as an active ingredient as well as a drug carrier. − It is observed that when both the zeolite and a drug are administered simultaneously to a patient, the pharmacological effect of the drug is not lost. It has been shown that the encapsulation of some hydrophobic chemotherapeutic medicines such as 5-fluorouracil, temozolomide, and α-cyano-4-hydroxy-cinnamic acid in various zeolite structures enhanced the action of drug molecules in biological system. ,,− Even the internalization of various zeolite moieties within cancer cells was found to be faster than the normal cell lines. − Encapsulation of different transition-metal complexes with molecular dimensions comparable to the diameter of zeolitic cavities has been immensely endeavored and numerous applications have been accentuated. − A copper Schiff base complex encapsulated inside zeolite-Y was screened for its cytotoxic activity. Interestingly, in comparison to cisplatin, a zeolite-Y-encapsulated Cu­(II)­hydrazone complex has shown a superior therapeutic effect in HePG2 cells (human liver cancer).…”