Field-induced slow relaxation of magnetisation in two one-dimensional homometallic dysprosium(iii) complexes based on alpha- and beta-amino acids. Issue 26 (24th June 2020)

• Record Type: Journal Article
• Authors: Orts-Arroyo, Marta; Castro, Isabel; Lloret, Francesc; Martínez-Lillo, José
• Is Part Of: Dalton transactions. Volume 49:Issue 26(2020)
• Page Start: 9155
• Page End: 9163
• Publication Date: 2020-06-24
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d0dt01126f
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Two novel one-dimensional dysprosium(iii ) complexes based on α-glycine (gly) and β-alanine (β-ala) amino acids have been synthesised and characterised structurally and magnetically. Both compounds exhibit field-induced slow relaxation of magnetisation. Abstract : Two one-dimensional dysprosium(iii ) complexes based on α-glycine (gly) and β-alanine (β-ala) amino acids, with the formula {[Dy2 (gly)6 (H2 O)4 ](ClO4 )6 ·5H2 O} n (1 ) and {[Dy2 (β-ala)6 (H2 O)4 ](ClO4 )6 ·H2 O} n (2 ), have been synthesised and characterised structurally and magnetically. Both compounds crystallise in the triclinic system with the space group P 1̄. In 1, two Dy III ions are eight-coordinate and bound to six oxygen atoms from six gly ligands and two oxygen atoms from two water molecules, showing different geometries (bicapped trigonal prism and square antiprism). In 2, two Dy III ions are nine-coordinate and bound to seven oxygen atoms from six β-ala ligands and two oxygen atoms from two water molecules in the same geometry (capped square antiprism). In the crystal packing of both compounds, cationic {[Dy2 (L)6 (H2 O)4 ] 6+ } n [L = α-glycine (1 ) and β-alanine (2 )] chains, ClO4 − anions, and water molecules generate a network connected through H-bonding interactions. The study of the magnetic properties of 1 and 2 through dc magnetic susceptibility measurements reveals different magnetic behaviour 1 and 2 . In addition, ac magnetic susceptibility measurements show a field-induced slow relaxation of magnetisation for both compounds, pointing out that the single-molecule magnet (SMM) phenomenon occurs in both 1 and 2 .