Premium
Trinuclear Lanthanide Coordination Clusters: Single‐Molecule‐Magnet Behavior and Catalytic Activity in the Friedel‐Crafts Alkylation Reaction
Author(s) -
Sarkar Arijit,
GómezGarcía Carlos J.,
Benmansour Samia,
Nayek Hari Pada
Publication year - 2019
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201900282
Subject(s) - chemistry , lanthanide , isostructural , alkylation , catalysis , denticity , single molecule magnet , diphenylmethane , friedel–crafts reaction , molecule , ligand (biochemistry) , crystallography , medicinal chemistry , crystal structure , ion , organic chemistry , magnetization , biochemistry , physics , receptor , quantum mechanics , magnetic field
A new multidentate ligand ( H 3 L ) was synthesized by the condensation reaction of 4‐ tert ‐butyl‐2,6‐diformylphenol and 2‐amino‐4‐nitrophenol. The reaction of the ligand with hydrated lanthanide nitrate produced two isostructural trinuclear coordination clusters: [DyLn 3 L 3 (DMF) 3 (H 2 O) 2 ] ⋅ 3.8DMFLn=Dy ( 1 ) and Nd ( 2 ) (DMF=N, N‐dimethylformamide). Single‐crystal X‐ray diffraction analysis revealed that there are three lanthanide ions arranged in an almost perfect linear fashion in both complexes. Magnetic studies show single‐molecule‐magnet (SMM) behavior in the Dy derivative with τ 0 =1.7×10 −6 s and a thermal energy barrier of 7.0 cm −1 . Both complexes were used as catalysts towards the Friedel‐Crafts alkylation reaction of indole with different aldehydes with yields varying from 59–98 %. Complex 1 showed better catalytic efficiency than complex 2 . This is the first report of using trinuclear lanthanide coordination clusters as catalysts for the Friedel‐Crafts alkylation reaction.