A new molecular building blocks: Synthesis,crystal structure,magnetic and spectroscopic properties of Cu(II) and Ni(II) macrocyclic complexes |
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| Authors: | Katarzyna Suracka Alina Bieńko Jerzy Mroziński Rafał Kruszyński Dariusz Bieńko Agnieszka Wojciechowska |
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| Affiliation: | 1. Faculty of Chemistry, University of Wroclaw,14 F. Joliot-Curie, PL-50 383 Wroclaw, Poland;2. Department of X-ray Crystallography and Crystal Chemistry, Institute of General and Ecological Chemistry Technical University Lodz, Zeromskiego 116, 90-924 Lodz, Poland;3. Faculty of Chemistry, Wroclaw University of Technology, Wybrzeze Wyspiańskiego 27, 50-370 Wroclaw, Poland |
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| Abstract: | New higly unsaturated macrocyclic building blocks [CuLSCN]·ClO4 (1) (L = N-dl-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene) and [NiL(SCN)2] (2) (L = N-dl-5,12-dimethyl-7,14-diisopropyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene) were synthesized and the crystal structures of both compounds were determined. Both complexes crystallizes in monoclinic, space group P21/n (1) and P21/c (2). Their magnetic properties were studied over the temperature range 1.8–300 K using a Quantum Design SQUID magnetometer (MPMSXL-5-type). The results indicate that both compounds behave as weakly interacting paramagnetic centers in the crystal lattice. The effects of hydrogen bond mediating the magnetic exchange interactions on the spin density have been evidenced by DFT calculations. The NIR–Vis–UV diffuse-reflectance electronic spectra confirm the square pyramidal and octahedral geometry around Cu2+ and Ni2+ metal ions. |
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