Influence of bridging and chelating co-ligands on the distinct single-molecule magnetic behaviours in ZnDy complexes

Panja, Anangamohan (author), Jagličić, Zvonko (author), Herchel, Radovan (author), Brandão, Paula (author), Jana, Narayan Ch. (author)

Four new heterometallic ZnDy complexes, [ZnDy(L)(NO3)3(py)]CH2Cl2 (1) (py stands for pyridine), [ZnDy(L)(m-OAc)(OAc)2]3H2O (2), [ZnDy(L)(m-OAc)(OAc)(NO3)] (3), and [ZnDy(L)(m-piv)(piv)2][ZnDy(L) (m-piv)(piv)(OAc)]1.5H2O (4), have been synthesized from a methyl substituted o-vanillin based compartmental Schiff base ligand, N,N0 -bis(3-methoxy-5-methylsalicylidene)-1,2-phenylenediamine (H2L), in association with various secondary co-ligands like acetate (OAc), nitrate and pivalate (piv), and magneto-structurally characterised. They possess a nearly identical [Zn(II)–Dy(III)] core, bridged by the phenoxo-O atoms of the compartmental Schiff base ligand. Magnetic studies revealed the distinct singlemolecule magnetic (SMM) behaviours through single to multiple relaxation channels, in which 1, 2 and 4 can display slow relaxation of magnetisation at a zero dc field, the performance of which can be further improved by applying a magnetic field at the expense of the reduction of under barrier relaxation processes, while 3 shows only field-induced weaker slow magnetic relaxation behaviours. Ab initio calculations were performed for the in-depth understanding of the magnetic dynamics in these complexes. The difference in the magnetic behaviours of the four complexes can be ascribed to the effect of bridging/chelating co-ligands in these complexes. Therefore, the present report highlights that the magnetic anisotropy is sensitive to the bridging/chelating co-ligands used, leading to the distinct magnetic dynamics in these systems.

• Language: English
• Keywords: molecular magnetism, magnetic relaxation
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering; FMF - Faculty of Mathematics and Physics
• Year: 2022
• Number of pages: Str. 18751-18763
• Numbering: Vol. 46, iss. 39, art. 18751
• PID: 20.500.12556/RUL-146430
• UDC: 544.2
• ISSN on article: 1369-9261
• DOI: 10.1039/d2nj03793a
• COBISS.SI-ID: 137343491
• Publication date in RUL: 31.05.2023

Record is a part of a journal

• Title: New journal of chemistry
• Shortened title: New j. chem.
• Publisher: Royal Society of Chemistry
• ISSN: 1369-9261
• COBISS.SI-ID: 22573573

Secondary language

• Language: Slovenian
• Keywords: molekularni magnetizem, relaksacija magnetizacije

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0348
• Name: Nove slikovno-analitske metode