Magnetic interactions in coordination species with 5-sulfosalicylates
Year: 2025
Type: article
Abstract: 5-sulfosalicylic acid (H 3 L) can selectively deprotonate and enable versatile coordination with metal ions. Several new coordination compounds with 5-sulfosalicylicilates were synthesized and characterized. A single crystal XRD analysis reveals structural arrangement of 1 , 2 and 4 . Strong antiferromagnetic (AFM) coupling is found for 4 ( J = −116 cm −1 ) agreeing with a pair short almost symmetric Cu∙∙∙O∙∙∙Cu’ bridges. The cobalt compound 3 reveals only a small orbital contribution L within almost magnetically isolated Co(II). A carefully chosen synthesis procedure with an additional family of ligands can give new compounds also by simple conditions as in water and at room temperature. 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-sulfosalicylicilates 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 .
Source: Polyhedron
Authors: Bojan Kozlevčar, Zvonko Jagličić, Andrej Pevec
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,740
OpenAlex ID: W4408199944