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Inne
Novel pyrazolate-based copper(II) [2x2] grid complexes: synthesis, structure and properties.
Autorzy
Rok wydania
2012
Czasopismo
Numer woluminu
392
Strony
322-330
DOI
10.1016/j.ica.2012.03.021
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
5-Acetyl-substituted pyrazole-3-carboxylic acid (H 2 L) forms [2×2] grid-like tetranuclear Cu(II) complexes with four five-coordinated copper(II) ions bridged by pyrazolate groups. Despite a significant dissociation of [Cu 4 L 4 (H 2 O) 4 ]·4H 2 O (1) in aqueous solution 1 , it was possible to substitute the coordinated water molecules by pyridine ligands or azide anions. The resulting tetranuclear complexes [Cu 4 L 4 Py 4 ]·2H 2 O (2) and Na 4 [Cu 4 L 4 (N 3 ) 4 ]·7MeOH (3) were isolated and studied by X-ray diffraction analysis. In 2 and 3 the azide anions or pyridine molecules complete the distorted square-pyramidal coordination of each copper(II) center. Magnetic susceptibilities of the obtained compounds have been measured by SQUID techniques. Simulation of the data using a Heisenberg spin Hamiltonian approach showed that the bridges between the metals mediate weak intramolecular antiferromagnetic coupling (J in the range −13.3 to −17.1cm −1 ) and lead to a singlet ground state in all cases.
Słowa kluczowe
Pyrazole ligands, copper(II), Grid complexes, magnetic properties
Adres publiczny
http://dx.doi.org/ 10.1016/j.ica.2012.03.021
Strona internetowa wydawcy
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