Polymorphism, mesomorphism and anti-oxidant character of homoleptic bis[()-2-(1-((-ethylphenyl)imino)ethyl)phenolato-κ-,]Ni/Cu() complexes

The proligand ( E )-2-(1-(( o -ethylphenyl)imino)ethyl)phenol (H L ) reacts with nickel( ii ) or copper( ii ) acetate to yield homoleptic bis[( E )-2-(1-(( o -ethylphenyl)imino)ethyl)phenolato-κ 2 - N , O ]nickel( ii ) ( 1 ) and copper( ii ) ( 2 ) complexes. Solid-state structures of both complexes...

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Bibliographic Details
Published in:New journal of chemistry 2023-12, Vol.47 (47), p.2184-21814
Main Authors: Enamullah, Mohammed, Mim, Afsana, Haque, Imdadul, Sidhu, Baldeep K, Kacperkiewicz, Amelia, Herbert, David E
Format: Article
Language:English
Subjects:
Antioxidants
Chelation
Copper
Copper acetate
Crystallization
Imines
Nickel
Optical microscopy
Oxidizing agents
Polarized light
Polymorphism
Rhomboids
Scavenging
X ray powder diffraction
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Summary:The proligand ( E )-2-(1-(( o -ethylphenyl)imino)ethyl)phenol (H L ) reacts with nickel( ii ) or copper( ii ) acetate to yield homoleptic bis[( E )-2-(1-(( o -ethylphenyl)imino)ethyl)phenolato-κ 2 - N , O ]nickel( ii ) ( 1 ) and copper( ii ) ( 2 ) complexes. Solid-state structures of both complexes were obtained, each bearing two equivalents of the N , O -chelating ligand and a square-planar geometry at the metal. The cupric species crystallized in two distinct habits - as blocks ( 2a ) and rhomboids ( 2b ). Despite the presence of different divalent metal ions, 1 and 2a are isostructural and both crystallize in the triclinic space group P 1&cmb.macr;, while polymorph 2b is monoclinic (space group P 2 1 / n ). The bulk isolated material of 2 is demonstrated to contain polymorph 2b almost exclusively by powder X-ray diffraction. DFT modelling supports the relative stability of the two polymorphs. Differential scanning calorimetry (DSC) and polarized light microscopy (PLM) reveal that the cupric complex in morphology 2b has mesogenic properties. Cyclic voltammograms diagnose irreversible redox events for both complexes in DMF, while the Schiff base and complexes exhibit a moderate to medium level of anti-oxidant scavenging activity. The homoleptic square-planar bis[( E )-2-(1-(( o -ethylphenyl)imino)ethyl)phenolato-κ 2 - N , O ]nickel( ii ) ( 1 ) and copper( ii ) ( 2 ) complexes. The cupric species crystallized in two distinct habits-as blocks ( 2a ) and rhomboids ( 2b ).
ISSN:1144-0546
1369-9261
DOI:10.1039/d3nj04915a