Syntheses, crystal structures and magnetic properties of complexes based on [Ni(L-L)3]2+ complex cations with dimethylderivatives of 2, 2'-bipyridine and TCNQ

Cernák, J. ; Hegedüs, M. ; Váhovská, L. ; Kuchár, J. ; Šoltésová, D. ; Cižmár, E. ; Feher, A. ; Falvello, L.R. (Universidad de Zaragoza)

Resumen: From the aqueous-methanolic systems Ni(NO3)2 – LiTCNQ – 5, 5'-dmbpy and Ni(NO3)2 – LiTCNQ – 4, 4'-dmbpy three novel complexes [Ni(5, 5'-dmbpy)3](TCNQ)2 (1), [Ni(4, 4'-dmbpy)3](TCNQ)2 (2) and [Ni(4, 4'-dmbpy)3]2(TCNQ-TCNQ)(TCNQ)2·0.60H2O (3), were isolated in single crystal form. The new compounds were identified using chemical analyses and IR spectroscopy. Single crystal studies of all samples corroborated their compositions and have shown that their ionic structures contain the complex cations [Ni(5, 5'-dmbpy)]2+ (1) or [Ni(4, 4'-dmbpy)]2+ (2 and 3). The anionic parts of the respective crystal structures 1–3 are formed by TCNQ·- anion-radicals and in 3 also by a s-dimerized dianion (TCNQ-TCNQ)2- with a C-C distance of 1.663(5) Å. The supramolecular structures are governed by weak hydrogen bonding interactions. The variable-temperature (2–300 K) magnetic studies of 1 and 3 confirmed the presence of magnetically active Ni(II) atoms with S = 1 and TCNQ·- anion-radicals with S = 1/2 while the (TCNQ-TCNQ)2- dianion is magnetically silent. The magnetic behavior was described by a complex magnetic model assuming strong antiferromagnetic interactions between some TCNQ·- anion-radicals.

Idioma: Inglés

DOI: 10.1016/j.solidstatesciences.2018.01.004

Año: 2018

Publicado en: SOLID STATE SCIENCES 77 (2018), 27-36
ISSN: 1293-2558

Factor impacto JCR: 2.155 (2018)

Categ. JCR: CHEMISTRY, INORGANIC & NUCLEAR rank: 21 / 45 = 0.467 (2018) - Q2 - T2
Categ. JCR: PHYSICS, CONDENSED MATTER rank: 36 / 68 = 0.529 (2018) - Q3 - T2
Categ. JCR: CHEMISTRY, PHYSICAL rank: 89 / 148 = 0.601 (2018) - Q3 - T2

Factor impacto SCIMAGO: 0.508 - Chemistry (miscellaneous) (Q2) - Materials Science (miscellaneous) (Q2) - Condensed Matter Physics (Q2)

Financiación: info:eu-repo/grantAgreement/EUR/ERDF/ITMS26220120047
Financiación: info:eu-repo/grantAgreement/EUR/ERDF/ITMS26220220186
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2015-68200-C2-1-P

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Química Inorgánica (Dpto. Química Inorgánica)