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Dinuclear Copper(II) Complexes with N,O Donor Ligands: Partial Ligand Hydrolysis and Alcohol Oxidation Catalysis
Author(s) -
Barma Arpita,
Bhattacharjee Aradhita,
Roy Partha
Publication year - 2021
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202100263
Subject(s) - chemistry , benzyl alcohol , aldehyde , catalysis , alcohol , medicinal chemistry , schiff base , copper , ligand (biochemistry) , hydrolysis , alcohol oxidation , polymer chemistry , organic chemistry , biochemistry , receptor
Two copper(II) complexes [Cu 2 (L 1 ) 2 ] ( 1 ) and [Cu 2 (L 2 ) 2 ] ( 2 ) where H 2 L 1 =2‐hydroxy‐3‐((3‐hydroxy‐2,2‐dimethylpropylimino)methyl)‐5‐methylbenzaldehyde and H 2 L 2 =2‐hydroxy‐3‐(((1‐hydroxypropan‐2‐yl)imino)methyl)‐5‐methylbenzaldehyde have been synthesized and used as catalysts in alcohol oxidation. 2,6‐Diformyl‐4‐methylphenol (DFP) based Schiff‐base ligands, 3,3′‐(2‐hydroxy‐5‐methyl‐1,3‐phenylene)bis(methan‐1‐yl‐1‐ylidene)bis(azan‐1‐yl‐1‐ylidene)bis(2,2‐dimethylpropan‐1‐ol) (H 3 L′) and 2,2′‐(((2‐hydroxy‐5‐methyl‐1,3‐phenylene)bis(methanylylidene))bis(azanylylidene))bis(propan‐1‐ol) (H 3 L′′), undergo partial hydrolysis to convert one of the azomethine groups to aldehyde group to give H 2 L 1 and H 2 L 2 , and then react with copper(II) acetate to yield complex 1 and 2 , respectively. These complexes have been characterized by standard methods such as elemental analysis, room temperature magnetic studies, FT‐IR, UV‐vis, ESI‐mass spectral analyses, cyclic voltammogram, etc . The structures of dinuclear complexes with modified ligands have been confirmed by single crystal X‐ray diffraction analysis. Complex 1 and 2 have been used as catalysts for the oxidation of benzyl alcohol, 4‐methyl benzyl alcohol, 4‐methoxy benzyl alcohol, 4‐nitro benzyl alcohol and 4‐bromo benzyl alcohol to the corresponding aldehyde as the sole product. Efficiency of the catalyst depends on the chain length and substitution on the chain of the ligand.