Novel pyrazolate-based copper(II) [2 x 2] grid complexes: Synthesis, structure and properties
(2012) In Inorganica Chimica Acta 392. p.322-330- Abstract
- 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... (More)
- 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3190075
- author
- Malinkin, Sergey O. ; Moroz, Yurii S. ; Penkova, Larysa V. ; Haukka, Matti ; Szebesczyk, Agnieszka ; Gumienna-Kontecka, Elzbieta ; Pavlenko, Vadim A. ; Nordlander, Ebbe LU ; Meyer, Franc and Fritsky, Igor O.
- organization
- publishing date
- 2012
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Pyrazole ligands, Copper(II), Grid complexes, Magnetic properties
- in
- Inorganica Chimica Acta
- volume
- 392
- pages
- 322 - 330
- publisher
- Elsevier
- external identifiers
-
- wos:000308696200047
- scopus:84865803097
- ISSN
- 0020-1693
- DOI
- 10.1016/j.ica.2012.03.021
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)
- id
- 9448e558-656b-4e52-9168-eb4339f4cd8a (old id 3190075)
- date added to LUP
- 2016-04-01 14:28:49
- date last changed
- 2022-02-19 19:13:06
@article{9448e558-656b-4e52-9168-eb4339f4cd8a,
abstract = {{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.}},
author = {{Malinkin, Sergey O. and Moroz, Yurii S. and Penkova, Larysa V. and Haukka, Matti and Szebesczyk, Agnieszka and Gumienna-Kontecka, Elzbieta and Pavlenko, Vadim A. and Nordlander, Ebbe and Meyer, Franc and Fritsky, Igor O.}},
issn = {{0020-1693}},
keywords = {{Pyrazole ligands; Copper(II); Grid complexes; Magnetic properties}},
language = {{eng}},
pages = {{322--330}},
publisher = {{Elsevier}},
series = {{Inorganica Chimica Acta}},
title = {{Novel pyrazolate-based copper(II) [2 x 2] grid complexes: Synthesis, structure and properties}},
url = {{http://dx.doi.org/10.1016/j.ica.2012.03.021}},
doi = {{10.1016/j.ica.2012.03.021}},
volume = {{392}},
year = {{2012}},
}