Naslov
CW-EPR study on a heterometallic (Ni2+ and Cr3+) complex

Autori
Žilić, Dijana ; Rakvin, Boris ; Jurić, Marijana ; Planinić, Pavica

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
EPR Summer School-Poster Abstracts and Contact Details / - , 2008, 69-69

Skup
SUSSP-64 and COST P15 Training School and 4th European EPR Federation Summer School in Advamced Techniques in EPR

Mjesto i datum
St. Andrews, Ujedinjeno Kraljevstvo, 22.08.2008. - 01.09.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
Heterometallic complexes; Nickel complexes; Chromium complexes; EPR

Sažetak
A powder sample and a single crystal of the heterometallic complex [Ni(bpy)3]2[Cr(C2O4)3]NO3∙ 10H2O, where bpy stands for 2, 2'-bipyridine, have been studied by continuous wave electron paramagnetic resonance (CW-EPR) at the microwave frequency ν ≈ 9.6 GHz. The crystal was rotated round three arbitrary, mutually perpendicular axes and EPR spectra were recorded from room to low temperatures (300-5 K). In the complex investigated, two paramagnetic species are present: Ni2+ with the spin S = 1 and Cr3+ with S = 3/2. In the frequency range examined, there was no evidence for the Ni2+ species, through the whole investigated range of temperature. Only the transition for the Cr3+ species has been observed. By using Bruker XSophe software, a powder simulation has been obtained and from the single-crystal measurements, with the spin-Hamiltonian approach, the following parameters for Cr3+ have been deduced: , cm-1, cm-1 and , where ρ is the angle between the magnetic z axis and the crystallographic b axis. The obtained EPR parameters exhibit nearly the same values at room and low temperatures confirming the absence of significant antiferromagnetic or ferromagnetic coupling. Non-appearance of Ni2+ spectrum in this experiment could be explained by the high value of its zero-field splitting parameter D or by the relaxation phenomena.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

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