The first heterometallic Cu(II)/Cr(III) complex with an open-chain Schiff-base ligand self-assembled from copper powder,Reineckes salt,ethylendiamine and acetone |
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| Authors: | Vitalina M Nikitina Oksana V Nesterova Vladimir N Kokozay Evgeny A Goreshnik Julia Jezierska |
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| Institution: | 1. Department of Inorganic Chemistry, National Taras Shevchenko University, Volodymyrska Str. 64, Kyiv 01033, Ukraine;2. Department of Inorganic Chemistry and Technology, Jo?ef Stefan Institute, Jamova Str. 39, 1000 Ljubljana, Slovenia;3. Faculty of Chemistry, University of Wroclaw, 14 Joliot-Curie Str., 50-383 Wroclaw, Poland |
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| Abstract: | A novel supramolecular assembly {Cu(enac)}2Cr(NCS)4(NH3)2]Cr(NCS)4(NH3)2]3 · 4(CH3)2CO (enac = 4,6,6-trimethyl-3,7-diazanon-3-ene-1,9-diamine), the first example of a Cu/Cr heterometallic compound containing a Schiff-base ligand such as enac, and an anion of Reineckes salt, Cr(NCS)4(NH3)2−, as a building block, was obtained by the self-assembly reaction of copper powder and Reineckes salt in an acetone/methanol (1:4) solution of ethylenediamine in the open air. An X-ray study shows that the complex includes a trinuclear Cu2Cr cation, constructed from two Cu(enac)2+ moieties and a trans-Cr(NCS)4(NH3)2]− block as a two-linking bridging ligand. The metal–metal separations within the cation are Cu?Cr = 6.393(31) Å and Cu?Cu = 12.786(63) Å. The supramolecular architecture of the complex involves two types of H-bonded chains, the first chain is generated by trinuclear cations {Cu(enac)}2Cr(NCS)4(NH3)2]2+, Cr(NCS)4(NH3)2]− anions and (CH3)2CO molecules, while the second by crystallographically different anions of Reineckes salt and (CH3)2CO. Variable-temperature (1.8–300 K) magnetic susceptibilities show a slight change of the μB value at low temperature, indicative of weak antiferromagnetic interactions (JCuCr = −0.9 cm−1) between the paramagnetic centers. |
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| Keywords: | Heterometallic complexes Reineckes anion Copper(II) Schiff-base ligand H-bonds |
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