Magnetic interactions in coordination species with 5-sulfosalicylates

Kozlevčar, Bojan (author), Jagličić, Zvonko (author), Pevec, Andrej (author)

5-sulfosalicylic acid (H$_3$L) poses three potential coordination groups (carboxylic, sulfonic and hydroxylic) that can deprotonate and enable versatile coordination options with metal ions. This includes a bridging mode, a suitable way to enable stronger magnetic interactions, among adjacent metal ions. Several novel coordination compounds with 5-sulfosalicylates were synthesized and characterized. These are {[Cu(inia)(HL)(H$_2$O)$_2$](H$_2$O)$_2$}$_n$ 1 (inia – isonicotinamide, C$_6$H$_6$N$_2$O), [Zn(inia)$_2$(HL)(H$_2$O)$_2$](H$_2$O) 2, Co(inia)(HL)(H$_2$O)$_5$ 3, {(CH$_6$N$_3$)$_2$[Cu(L)(H$_2$O)]$_2$(2OHpy)$_4$} 4 (2OHpy − 2-hydroxypyridine, C$_5$H$_5$NO; CH$_6$N$_3^+$ − guanidinium cation), and (CH$_6$N$_3$)Cu(L)(H$_2$O) 5. A single crystal XRD analysis reveals structural arrangement of 1, 2 and 4. CHN and IR analyses corroborate with the structural data and propose rational formulae also for 3 and 5. A strong antiferromagnetic (AFM) coupling is found for 4 (J = −116 cm$^{−1}$/mol Cu(II)) being in agreement with a pair short monoatomic Cu•••O•••Cu’ coordination bridges (Cu•••O 1.941/ Cu’•••O 1.998 Å) showing pseudo dimers within coordination polyanions. As no such short contacts are seen for 1, the magnetically isolated Cu(II) are present in a neutral coordination formulae, while diamagnetic Zn(II) is in 2. Additionally, a strong AFM coupling is present also in 5 (J = −126 cm$^{−1}$/mol Cu(II)) with a formulae also suggesting ionic constituents as in 4. The cobalt compound 3 reveals only a small orbital contribution L within almost magnetically isolated Co(II), giving D = 56.5 cm$^{−1}$, E = −0.34 cm$^{−1}$, and zJ = −0.011 cm$^{−1}$.

• Language: English
• Keywords: 5-sulfosalicylic acid, copper, cobalt, structure, antiferromagnetism
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FKKT - Faculty of Chemistry and Chemical Technology; FGG - Faculty of Civil and Geodetic Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2025
• Number of pages: 8 str.
• Numbering: Vol. 273, art. 117482
• PID: 20.500.12556/RUL-167755
• UDC: 546.56:546.73:547.541
• ISSN on article: 0277-5387
• DOI: 10.1016/j.poly.2025.117482
• COBISS.SI-ID: 228453891
• Publication date in RUL: 10.03.2025

Record is a part of a journal

• Title: Polyhedron
• Shortened title: Polyhedron
• Publisher: Elsevier
• ISSN: 0277-5387
• COBISS.SI-ID: 26153984

Licences

• License: CC BY-NC 4.0, Creative Commons Attribution-NonCommercial 4.0 International
• Link: http://creativecommons.org/licenses/by-nc/4.0/
• Description: A creative commons license that bans commercial use, but the users don’t have to license their derivative works on the same terms.

Secondary language

• Language: Slovenian
• Keywords: 5-sulfosalicilna kislina, baker, kobalt, struktura, antiferomagnetizem