Copper(II)/di-2-pyridyl ketone chemistry: A triangular cluster displaying antisymmetric exchange versus an 1D coordination polymer
Date
2013Author
Efthymiou, Constantinos G.Raptopoulou, Catherine P.
Psycharis, Vassilis P.
Tasiopoulos, Anastasios J.
Escuer, Albert
Perlepes, Spyros P.
Papatriantafyllopoulou, Constantina
Source
PolyhedronVolume
64Pages
30-37Google Scholar check
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The systematic study of the reaction system copper(II) perchlorate/di-2- pyridyl ketone, (py)2CO, provided access to the new trinuclear compound [Cu3{(py)2C(OMe)(O)}3(H 2O)](ClO4)3·MeOH·0.6H 2O (1·MeOH·0.6H2O), and the 1D coordination polymer [Cu2{(py)2C(OEt)(O)}(HCO2) 2(ClO4)(MeCN)]n (2) bearing the anionic hemiketal forms of (py)2CO. Both compounds were prepared from reactions of Cu(ClO4)2·6H2O with the ligand, in the presence of NEt3 in MeOH (1) or MeCN/TEOF (2), where TEOF is triethylorthoformate. Compound 1 possesses a triangular metal topology representing an example of a non-oxido/hydroxido/methoxido-centered Cu 3 species. Compound 2 is based on dinuclear units linked through HCO2- groups forming an 1D chain. EPR spectra and variable temperature dc magnetic susceptibility studies on powdered polycrystalline samples of 1 revealed the presence of strong antiferromagnetic interactions between the metal centers leading to an S = 1/2 ground state. The magnetic susceptibility data were fit using a model including antisymmetric exchange interactions and the antisymmetric exchange vector parameter GZ value has been determined. © 2013 Elsevier Ltd. All rights reserved.