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 SM ISO690:2012BOTEZAT, Olga, FILIPPOVA, Irina, HAUSER, J, KRAMER, Karl W, DECURTINS, Silvio, BACA, Svetlana. Synthesis, crystal structure and properties of μ3-oxotricromium(III) propionate cluster with pyrazole. In: Materials Science and Condensed Matter Physics, Ed. 7, 16-19 septembrie 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2014, Editia 7, p. 151. |
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| Materials Science and Condensed Matter Physics Editia 7, 2014 |
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Conferința "Materials Science and Condensed Matter Physics" 7, Chișinău, Moldova, 16-19 septembrie 2014 | ||||||
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Trinuclear chromium(III) carboxylate complexes have been intensively investigated due to their specific biological properties. The synthetic chromium propionate complex [Cr3O(prop)6(H2O)3]+ has already been found to increase insulin sensitivity in healthy and type 2 diabetic rats [1]. Moreover, such compounds have been shown to possess novel physical properties, especially magnetic properties [2]. The novel complex [Cr3(μ3-O)(prop)6(pyr)3]·NO3 (1) (prop = propionate, pyr = pyrazole) has been synthesized and characterized by IR spectroscopy, X-ray crystallography, magnetochemical and thermal analysis. X-ray analysis reveals that asymmetric unit of 1 contains two crystallographycally independent trinuclear cations [Cr3O(prop)6(pyr)3]+ and associated NO3 anions (Fig. 1). The clusters in 1 reside in general position. Three Cr atoms in both clusters form almost equilateral triangle with the O atom in the center. The Cr (μ3-O) distances equal 1.906(2), 1.897(2), and 1.893(2) Å for one cation, and 1.903(2), 1.895(2), and 1.906(2) Å for other one. Each pair of Cr atoms is linked by bidentate propionate ligand. The Cr-Ocarb bond distances lie in the range of 1.951(3) - 1.992(2) Å. A distorted octahedral environment is completed by three monodentate pyr molecules. The Cr N distances in all cases are similar and vary from 2.089(3) to 2.107(3) Å. Figure 1. Asymmetric unit of [Cr3(μ3-O)(prop)6(pyr)3]·NO3. H atoms are omitted for clarity. Dotted lines show N-H…O hydrogen bonds. N H…O hydrogen bonds between trinuclear cations and NO3 anions connect adjacent clusters in layers. The layers are held together only by van der Waals interactions. Detailed studies of magnetic properties of 1 were performed to establish the nature of magnetic interactions between metal ions. |
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