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Isothiocyanate controlled architecture, spectroscopic, and magnetic behavior of copper(II) l-arginine complexes
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.
Vise andre og tillknytning
2019 (engelsk)Inngår i: Journal of coordination chemistry (Print), ISSN 0095-8972, E-ISSN 1029-0389Artikkel i tidsskrift (Fagfellevurdert) Epub ahead of print
Abstract [en]

We 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 (=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 (C=N) stretching vibrations, corresponding to NCS- ions N-bonded to the central Cu(II) (2077cm(-1)) and in the lattice (2057cm(-1)). In 2 a single band is observed at 2102cm(-1), indicating equivalent NCS- ions in the structure. The EPR spectra of complexes show anisotropic signal with g(perpendicular to) 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 d(x2-y2) orbital, also confirmed by the single envelope of d-d bands at ca. 16,000cm(-1) for 1 and 16,500cm(-1) for 2. The magnetic properties ofcompounds are characteristic of a very weak antiferromagnetic interaction with J=-0.055cm(-1) and J=-0.096cm(-1) for 1 and 2, respectively. [GRAPHICS] .

sted, utgiver, år, opplag, sider
Taylor & Francis, 2019.
Emneord [en]
Copper(II), L-arginine, isothiocyanate, crystal structure, FT-IR spectra, Raman spectra, NIR-Vis-UV electronic spectra, EPR spectra, magnetism
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-158579DOI: 10.1080/00958972.2019.1597065ISI: 000464620900001OAI: oai:DiVA.org:umu-158579DiVA, id: diva2:1318395
Tilgjengelig fra: 2019-05-27 Laget: 2019-05-27 Sist oppdatert: 2019-05-27bibliografisk kontrollert

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