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  4. Schiff base ligands derived from 1,2-bis(2 '-nitro-/amino-phenoxy)-3-R-benzene and 2-hydroxy-1-naphthaldehyde and their Cu/Zn(II) complexes: synthesis, characterization, X-ray structures and computational studies
 
research article

Schiff base ligands derived from 1,2-bis(2 '-nitro-/amino-phenoxy)-3-R-benzene and 2-hydroxy-1-naphthaldehyde and their Cu/Zn(II) complexes: synthesis, characterization, X-ray structures and computational studies

Aryaeifar, Mahnaz
•
Amiri Rudbari, Hadi
•
Blacque, Olivier
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July 30, 2021
Crystengcomm

1,2-Bis(2'-nitrophenoxy)-3-R-benzenes {R = H (1), CH3 (2) and OCH3 (3)} have been prepared from the S-N-Ar reaction between 1-fluoro-2-nitrobenzene and 3-R-catechol (aromatic diol), and are then reduced to the corresponding diamines 1,2-bis(2'-aminophenoxy)-3-R-benzene {R = H (4), CH3 (5) and OCH3 (6)}, respectively. Reaction of these diamines with 2-hydroxy-1-naphthaldehyde gives tetradentate Schiff base ligands {H2L: R = H (H2L1), CH3 (H2L2) and OCH3 (H2L3)}, respectively. The Schiff base ligands coordinate to metal(II) ions to provide the complexes ML1, ML2 and ML3 (M = Cu and Zn), respectively. X-ray molecular structure determinations were performed to explore stereochemical rigidity as the origin of chirality induction in the dinitro (2), diamine (5) and Schiff base ligands (H2L1 and H2L2) as well as in the complexes (ZnL2, ZnL3 and CuL3), respectively. The structures feature an N2O2-chromophore from bis(2-oxo-1-naphthaldiminate) moieties with one additional weak Cu/Zn center dot center dot center dot O (ether) contact to give a 4 + 1 coordination with a distorted square-pyramidal geometry for ZnL2, ZnL3 and CuL3, respectively. Without considering this additional contact, the structures are distorted tetrahedral or distorted square-planar for the Zn or Cu complexes, such that a chiral Lambda- and Delta-configuration at the metal atom is induced. All three metal complexes crystallize as a crystalline racemate or racemic mixture of Lambda/Delta-ML. The supramolecular packing in the structures is organized by inter-/intra-molecular pi-pi and C-H center dot center dot center dot pi interactions, respectively. The optimized structures and excited state properties from DFT/TDDFT calculations support the experimental results.

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Type
research article
DOI
10.1039/d1ce00829c
Web of Science ID

WOS:000687186400001

Author(s)
Aryaeifar, Mahnaz
Amiri Rudbari, Hadi
Blacque, Olivier
Islam, Mohammad Khairul
Scopelliti, Rosario  
Braun, Jason D.
Herbert, David E.
Bruno, Giuseppe
Janiak, Christoph
Enamullah, Mohammed
Date Issued

2021-07-30

Publisher

ROYAL SOC CHEMISTRY

Published in
Crystengcomm
Volume

23

Issue

36

Start page

6322

End page

6339

Subjects

Chemistry, Multidisciplinary

•

Crystallography

•

Chemistry

•

center-dot-pi

•

crystal-structure

•

circular-dichroism

•

metal-complexes

•

electronic-properties

•

zinc(ii) complexes

•

spectral characterization

•

copper(ii) complexes

•

nickel(ii) complexes

•

helicity inversion

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
ISIC-GE  
Available on Infoscience
August 28, 2021
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/181021
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