Three angular Zn2Dy complexes showing the effect of remote coordination at Zn and counter ions on slow magnetic relaxation at Dy centres

abstract

Three new angular trinuclear Zn2Dy complexes, [Dy{Zn(L)Cl}(2)(H2O)(2)]Cl center dot 3H(2)O (1), [Dy{Zn(L)Br}(2)(H2O)(2)](NO3)center dot 6H(2)O (2) and [Dy{Zn(L)I}(2)(H2O)(2)](NO3)center dot 6H(2)O (3), derived from a methyl substituted o-vanillin based Schiff base ligand, N,N'-bis(3-methoxy-5-methylsalicylidene)-1,2-phenylenediamine (H2L), have been synthesized and magneto-structurally characterised. In the complex cations in 1-3, the coordination environments of the Dy(III) ions are identical, but the apical coordination to the Zn(II) ion is different as it is bonded to different halide ions. Magnetic studies reveal that both 2 and 3 display field-supported slow magnetic relaxation, consistent with the isomorphic nature of the compounds, while 1 exhibits more pronounced single-molecule magnetic behaviour. The direct fitting of the experimental data as well as the analysis with CASSCF calculations and SINGLE_ANISO module reveals a variation in magnetic anisotropy within the series and the presence of weak antiferromagnetic intermolecular interactions. Therefore, the present report highlights the influence of remote coordination at Zn and counter ions on magnetic anisotropy and on intermolecular antiferromagnetic dipolar interactions, leading to distinct magnetic dynamics in these systems.

keywords

SINGLE-MOLECULE MAGNET; LANTHANIDE COMPLEXES; BASIS-SETS; BEHAVIOR; CRYSTAL; LIGANDS; FAMILY; TB; LN; LUMINESCENCE

subject category

Chemistry

authors

Panja, A; Jaglicic, Z; Herchel, R; Brandao, P; Pramanik, K; Jana, NC

our authors

acknowledgements

A. P. gratefully acknowledges the financial support for this work from the Government of West Bengal through the Department of Science & Technology and Biotechnology, Kolkata, India (Sanction No. 331/ST/P/S&T/15G-8/2018, dated-19.06.2019). Z. J. acknowledges the financial support from the Slovenian Research Agency (Grant No. P2-0348). R. H. acknowledges the financial support from the institutional sources of the Department of Inorganic Chemistry, Palacky University Olomouc, Czech Republic.

Share this project:

Related Publications

We use cookies for marketing activities and to offer you a better experience. By clicking “Accept Cookies” you agree with our cookie policy. Read about how we use cookies by clicking "Privacy and Cookie Policy".