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Synthesis, structure and magnetic properties of homotrinuclear Ni(II) complexes with asymmetric Schiff-base ligands

Öz, Sevi and Acar, Nurcan and Svoboda, Ingrid and Titiš, Ján and Boča, Roman and Atakol, Orhan (2014):
Synthesis, structure and magnetic properties of homotrinuclear Ni(II) complexes with asymmetric Schiff-base ligands.
In: Inorganica Chimica Acta, 421Elsevier Science Publishing, pp. 531-537, ISSN 00201693,
[Online-Edition: http://dx.doi.org/10.1016/j.ica.2014.07.020],
[Article]

Abstract

By using 1,3-propanediamine, 2-hydroxyacetophenone and salicylaldehyde an asymmetric ONNO type Schiff base, N(hydroxyphenylidene)-N′(2-hydroxyacetophenylidene)-1,3-propanediamine (H2metsalpn), has been prepared and isolated. This Schiff base has been reduced yielding N(2-hydroxybenzyl)-N′[1-(2-hydroxyphenyl)ethyl]-1,3-diaminopropane (H2metsalpnH) These two ligands were used in preparing three trinuclear Ni(II) complexes with catena-[Ni3] structural motif, where DMF and carboxylato (formato, acetato, benzoato) ligands occur. These complexes were characterized by EA, IR, TG, DTA and MS data. The X-ray diffraction confirms that the Ni(II) central atoms are in a distorted octahedral coordination environment: the terminal centers possess {NiN2O4} octahedral coordination sphere whereas the very central atom possesses {NiO6} chromophore. The coordinated DMF groups are liberated between 140–240 °C. The SQUID magnetometry confirms presence of weak exchange coupling of the antiferromagnetic nature, J/hc = −2 to −7 cm−1, with a moderate single-ion anisotropy reflected by the zero-field splitting D/hc = +4 to +7 cm−1.

Item Type: Article
Erschienen: 2014
Creators: Öz, Sevi and Acar, Nurcan and Svoboda, Ingrid and Titiš, Ján and Boča, Roman and Atakol, Orhan
Title: Synthesis, structure and magnetic properties of homotrinuclear Ni(II) complexes with asymmetric Schiff-base ligands
Language: English
Abstract:

By using 1,3-propanediamine, 2-hydroxyacetophenone and salicylaldehyde an asymmetric ONNO type Schiff base, N(hydroxyphenylidene)-N′(2-hydroxyacetophenylidene)-1,3-propanediamine (H2metsalpn), has been prepared and isolated. This Schiff base has been reduced yielding N(2-hydroxybenzyl)-N′[1-(2-hydroxyphenyl)ethyl]-1,3-diaminopropane (H2metsalpnH) These two ligands were used in preparing three trinuclear Ni(II) complexes with catena-[Ni3] structural motif, where DMF and carboxylato (formato, acetato, benzoato) ligands occur. These complexes were characterized by EA, IR, TG, DTA and MS data. The X-ray diffraction confirms that the Ni(II) central atoms are in a distorted octahedral coordination environment: the terminal centers possess {NiN2O4} octahedral coordination sphere whereas the very central atom possesses {NiO6} chromophore. The coordinated DMF groups are liberated between 140–240 °C. The SQUID magnetometry confirms presence of weak exchange coupling of the antiferromagnetic nature, J/hc = −2 to −7 cm−1, with a moderate single-ion anisotropy reflected by the zero-field splitting D/hc = +4 to +7 cm−1.

Journal or Publication Title: Inorganica Chimica Acta
Volume: 421
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Ni(II) complexes, Trinuclear complexes, Asymmetric Schiff base, Crystal structure, Magnetism
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Structure Research
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 23 Jan 2015 09:23
Official URL: http://dx.doi.org/10.1016/j.ica.2014.07.020
Identification Number: doi:10.1016/j.ica.2014.07.020
Funders: Grant Agencies (Slovakia: VEGA 1/0522/14, VEGA 1/0233/12, APVV-0014-11) are acknowledged for the financial support. , In addition, financial support of this work by the University of Ankara Scientific Research Fund under contract no. 12B4240003 and Ahi Evran University Scientific Research Fund under contract no. 4001.12.014 are gratefully acknowledged.
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