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Novel pyrazolate-ba...
Novel pyrazolate-based copper(II) [2 x 2] grid complexes: Synthesis, structure and properties
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Malinkin, Sergey O. (author)
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Moroz, Yurii S. (author)
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Penkova, Larysa V. (author)
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Haukka, Matti (author)
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Szebesczyk, Agnieszka (author)
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Gumienna-Kontecka, Elzbieta (author)
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Pavlenko, Vadim A. (author)
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- Nordlander, Ebbe (author)
- Lund University,Lunds universitet,Kemisk fysik,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Chemical Physics,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
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Meyer, Franc (author)
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Fritsky, Igor O. (author)
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(creator_code:org_t)
- Elsevier BV, 2012
- 2012
- English.
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In: Inorganica Chimica Acta. - : Elsevier BV. - 0020-1693. ; 392, s. 322-330
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http://dx.doi.org/10...
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Abstract
Subject headings
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- 5-Acetyl-substituted pyrazole-3-carboxylic acid (H2L) forms [2 x 2] grid-like tetranuclear Cu(II) complexes with four five-coordinated copper(II) ions bridged by pyrazolate groups. Despite a significant dissociation of [Cu4L4(H2O)(4)]center dot 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 [Cu4L4Py4]center dot 2H(2)O (2) and Na-4[Cu4L4(N-3)(4)]center dot 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 -17.1 cm (1)) and lead to a singlet ground state in all cases. (C) 2012 Elsevier B.V. All rights reserved.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Keyword
- Pyrazole ligands
- Copper(II)
- Grid complexes
- Magnetic properties
Publication and Content Type
- art (subject category)
- ref (subject category)
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