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“Wheel-and-axle” binuclear Cu(II) dioximates mediated by 1,2-bis(4-pyridyl)ethane: Synthesis, X-ray study and luminescent properties |
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| Authors: | Eduard B CoropceanuMark M Botoshansky Anatolii V SiminelMarina S Fonari |
| Institution: | a Institute of Chemistry Academy of Sciences of R. Moldova, Academy Str., 3, MD2028 Chisinau, Republic of Moldova b Institute of Applied Physics Academy of Sciences of R. Moldova, Academy Str., 5, MD2028 Chisinau, Republic of Moldova c Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, 32000 Haifa, Israel |
| Abstract: | The reaction of copper(II) acetate or fluoride with classic dioximes in the presence of 1,2-bis(4-pyridyl)ethane resulted in four novel compounds with the compositions Cu2(dmgH)4bpe] (1), Cu2(NioxH)4bpe] (2), Cu2(dpgH)4bpe] (3), and Cu2(dpgH)4bpe]Cu(dpgH)2bpe]2·2DMF (4) (where dmgH2 = dimethylglyoxime, NioxH2 = 1,2-cyclohexanedionedioxime, dpgH2 = diphenylglyoxime, bpe = 1,2-bis(4-pyridyl)ethane, and DMF = N,N′-dimethylformamide), whose crystal structures were determined by single crystal X-ray diffraction. In the binuclear molecules 1-3, as well as in both binuclear and mononuclear molecules in 4 each Cu(II) atom has an identical N5-environment formulated by four oximic nitrogen atoms of two monodeprotonated ligands in a slightly distorted square planar mode, and the nitrogen atom of the bpe molecule being in the apical position. The new compounds were characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. Luminescence investigations for 1, 2 and 4 were carried out to clarify whether the guest inclusion in the crystal lattice is accompanied by changes in the emission spectra. |
| Keywords: | Cu(II) complexes 1 2-Bis(4-pyridyl)ethane Single crystal X-ray diffraction Porosity Luminescence |
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