Aromatic properties of 8-hydroxyquinoline and its metal complexes

• Authors: Krzysztof Zborowski , Miquel Solá , Jordi Poater , Leonard Proniewicz
• Languages of publication: EN

Abstracts

EN

Chelatoaromaticity (aromaticity of chelate complexes) has been recently recognized as an important property influencing the stability of chelate compounds. In this paper, aromaticity of various forms of 8-hydroxyquinoline (anion, neutral molecule, zwitterion and cation) as well as its chelate complexes with magnesium and aluminium ions are investigated. Aromatic properties of these compounds are analyzed using several aromaticity indices based on energetic, geometric, magnetic and electronic physical manifestations of this phenomenon. Results of performed calculations have shown different aromatic properties for the two rings (pyridine and benzene) occurring in the studied ligand. Aromaticity of these rings in metal complexes of 8-hydroxyquinoline is significantly higher than that in corresponding ligand anion. This means that during complexation the aromaticity of the ligand increases and the chelatoaromatic effect stabilizes the studied metal complexes. In contrast, metallocyclic rings of studied metal complexes have non-aromatic properties, and, consequently, the metallocyclic ring is not stabilized by chelatoaromaticity. We conclude that, in the complex, every 8-hydroxyquinoline unit and the metal ion are separated p-electronic systems. [...]

Keywords

EN

8-hydroxyquinoline; Aromaticity; Chelatocomplexes; Chelatoaromaticity

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2013
• Volume: 11
• Issue: 5
• Pages: 655-663

Dates

published

1 - 5 - 2013

online

27 - 2 - 2013

Contributors

author

Krzysztof Zborowski

• Faculty of Chemistry, Jagiellonian University, 30-060, Kraków, Poland

author

Miquel Solá

• Institute of Computational Chemistry and Department of Chemistry, Girona University, 17071, Girona, Catalonia, Spain

author

Jordi Poater

• Institute of Computational Chemistry and Department of Chemistry, Girona University, 17071, Girona, Catalonia, Spain

author

Leonard Proniewicz

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Identifiers

DOI

10.2478/s11532-013-0215-6