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Agnieszka Wojciechowska Jan Janczak Tomasz Rojek Andras Gorzsas Magdalena Malik-Gajewska Marek Duczmal 《Journal of Coordination Chemistry》2019,72(8):1358-1377
AbstractWe synthesized an l–arginine complex with the formula [Cu(l–Arg)2(NCS)]·(NCS)·H2O (1) (l–Arg = l–arginine). Two cis-chelated l–arginine zwitterions form the basal plane, while the weakly N-bonded isothiocyanate is located at the apex of the distorted square pyramidal structure (τ?=?0.143). The non-coordinated NCS? anions held layers together in a 3-D supramolecular network. The crystal structure, spectroscopic (FT–IR, Raman, NIR–Vis–UV, EPR) and magnetic properties of 1 have been compared with [Cu(l–Arg)(NCS)2] (2). For 1, two absorptions are observed for ν(C?=?N) stretching vibrations, corresponding to NCS? ions N-bonded to the central Cu(II) (2077?cm?1) and in the lattice (2057?cm?1). In 2 a single band is observed at 2102?cm?1, indicating equivalent NCS? ions in the structure. The EPR spectra of complexes show anisotropic signal with g⊥ and g|| 2.062, 2.235 (1), and 2.08, 2.225 (2) characteristic for cis-N2O2 and N3O donor sets in the xy plane, respectively. The unpaired electron mainly occupies the dx2–y2 orbital, also confirmed by the single envelope of d–d bands at ca. 16,000?cm?1 for 1 and 16,500?cm?1 for 2. The magnetic properties ofcompounds are characteristic of a very weak antiferromagnetic interaction with J?=??0.055?cm?1 and J?=??0.096?cm?1 for 1 and 2, respectively. 相似文献
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Dzimitrowicz Anna Bielawska-Pohl Aleksandra Pohl Pawel Jermakowicz-Bartkowiak Dorota Jamroz Piotr Malik-Gajewska Magdalena Klimczak Aleksandra Cyganowski Piotr 《Plasma Chemistry and Plasma Processing》2020,40(4):1037-1062
Plasma Chemistry and Plasma Processing - In this work, the gold nanoparticles (AuNPs) were synthesized using pulse-modulated radio-frequency atmospheric pressure glow discharge (pm-rf-APGD). By... 相似文献
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