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MICHITIUC, Olga; KRAVTSOV, Viktor; BACA, Svetlana. Dinuclear Cu(II) isobutyrates with 4-pyridinecarboxaldehyde and dimethyl sulfoxide. In: Materials Science and Condensed Matter Physics. Ediția a 9-a, 25-28 septembrie 2018, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2018, p. 140.
|Materials Science and Condensed Matter Physics
Ediția a 9-a, 2018
Conferința "International Conference on Materials Science and Condensed Matter Physics" |
Chișinău, Moldova, 25-28 septembrie 2018
A new dinuclear copper(II) coordination compound based on isobutyric acid and 4-pyridinecarboxaldehyde (pyca) of the formula [Cu2(is)4(pyca)2] (1) has been synthesized and characterized by a range of physical methods including IR spectroscopy and thermogravimetric analysis. A single-crystal X-ray diffraction analysis shows that 1 crystalizes in the tetragonal space group I4122 with a = b =15.5155(7), c = 13.7051(9) Å, V = 3299.2(3) Å3. In the structure 1 dinuclear complex reside on special position and has D2 molecular symmetry. The complex reveals two square pyramidal Cu(II) centers with each Cu(II) atom bound to four O atoms from four isobutyrates and one N atom of pyca ligand forming a NO4 donor set (Figure 1). The Cu-O bond distances are in the range of 1.951(6) and 1.960(6) Å, Cu-N bond distance equals to 2.181(7) Å and Cu…Cu distance is 2.615(2) Å. Changing the solvent from acetone to dimethyl sulfoxide in the similar reaction led to the precipitation of a dinuclear [Cu2(is)4(dmso)2] (2) complex, where an apical position to each copper atom occupies by dmso molecule instead of pyca in 1 (Figure 1b). Complex 2 crystalizes in the trigonal space group R-3 with a = b = 19.4596(8), c = 22.1622(8) Å, V = 7267.94(8) Å3. In crystal the complex resides on an inversion center thus having Ci symmetry. The square pyramidal Cu(II) atoms are coordinated by four O atoms from four isobutyrates and one O atom of dmso ligand forming an O5 donor set (Cu-Ocarb, 1.94(2) - 1.98(2); Cu-Odmso, 2.133(4) Å). Compare to 1, the Cu…Cu distance of 2.635(8) Å is slightly longer in 2. The peculiarities of the reaction conditions as well as the possibilities to arrange such dinuclear copper(II) clusters into extended networks will be discussed.