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Structure, XAS and magnetism of nickel(II) heterometallic complexes based on the [Cr(NCS)4 (NH3)2 ]− units
Autorzy
Rok wydania
2026
Czasopismo
Journal of Coordination Chemistry
Numer woluminu
79
Strony
216-237
DOI
10.1080/00958972.2025.2595473
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The new heterometallic compounds, {Ni(tn)2[Cr(NCS)4(NH3)2]2}n (1), [Ni(N-Me-en)2][Cr(NCS)4(NH3)2]2 (2) and [Ni(N-Et-en)2][Cr(NCS)4(NH3)2]2 (3) (tn = 1,3-propanediamine, en = ethylenediamine), were synthetized and characterized by X-ray analysis, IR spectra, XRD, XAS and magnetic measurements. The compound 1 crystallized in the triclinic P–1 space group. This compound consisted of a heterometallic Ni-Cr motifs in the “regular” zigzag chain, in which metal ions were coordinated by a single thiocyanate µ1,3-NCS− bridge, and the [Cr(NCS)4(NH3)2]3− unit was the counterion. Crystal lattice of compounds 2 and 3 had a monoclinic P21/c symmetry. The nickel coordination sphere is formed by four nitrogen atoms from amine molecule in square-planar geometry. The N K-edge and Ni, Cr L-edge XAS spectra confirmed the elemental composition and local geometry of transition metals occurring in newly synthesized molecular materials. Similarities in topology, local symmetry and structure enabled significant simplification of the magnetic properties modeling by assuming magnetic coupling inside the {NiIICrIII} chain separated by paramagnetic [Cr(NCS)6]3− ions in 1. The obtained results indicated dominant antiferromagnetic interactions between paramagnetic metal ions in this 1D polymer. The heterometallic compounds 2 and 3 have a spontaneous magnetic moment related to their electron configuration and spin state with diamagnetic nickel ions, having square-planar geometry.
Słowa kluczowe
Heterometallic complexes, nickel(II), chromium(III), X-ray crystallography, XAS spectra, magnetism
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