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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Spiccia, L.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2016Parameters responsible for the degradation of CH3NH3PbI3-based solar cells on polymer substratescitations
- 2013Highly active screen-printed electrocatalysts for water oxidation based on b-manganese oxidecitations
- 2006Structure and magnetic properties of polynuclear chloro- and hydroxo- bridged copper II complexes formed by a tetramacrocyclic derivative of 1,4,7-triazacyclononanecitations
- 2005Imidazole derivatives of binuclear copper(II) and nickel(II) complexes incorporating bis(1,4,7-triazacyclononan-1-yl) ligandscitations
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article
Structure and magnetic properties of polynuclear chloro- and hydroxo- bridged copper II complexes formed by a tetramacrocyclic derivative of 1,4,7-triazacyclononane
Abstract
Two new copper(II) complexes of the ligand 1,2,4,5-tetrakis(1,4,7-triazacyclononan-1-ylmethyl) benzene (L-dur) have been synthesized and characterized by single crystal X-ray studies. The first, [Cu4Ldur(mu(2)-OH)(4)]Cl2PF6)(2) center dot 8H(2)O (1), was isolated from a solution of L-dur and Cu2+ at pH 9. Under acidic conditions (pH 3), a polymeric complex, {(Cu4Ldur([mu(2)-Cl)(6)](PF6)(2) center dot 10H(2)O}(n) (2), crystallized from solution. In both complexes, each of the four triazacyclononane (tacn) rings of the L-dur ligand facially coordinate to separate metal centres. Pairs of Cu(II) centres are then doubly-bridged by hydroxo groups in 1, leading to tetranuclear complex cation units featuring pairs of isolated copper(II) dinners with Cu-2(mu(2)-OH)(2) cores folded at the O center dot center dot center dot O lines. Two forms of the tetranuclear units, featuring slightly different Cu-2(mu(2)-OH)(2) core geometries, are present in equal amounts within the crystal lattice. In complex 2, chloro bridging ligands link pairs of Cu(II) centres from neighbouring tetranuclear units, forming a I D helical polymeric structure. Variable-temperature magnetic susceptibility measurements suggest that the hydroxo-bridged copper(II) centres within one of the tetranuclear units in I are weakly antiferromagnetically coupled (J = -27 cm(-1)), whilst those in the other interact ferromagnetically (J = +19 cm(-1)). Similar measurements indicate weak ferromagnetic coupling (J = +16 cm(-1)) for the chloro-bridged copper(II) centres in 2. (c) 2005 Elsevier B.V. All rights reserved.