Issue 33, 2023

Structures and magnetic anisotropies of two seven-coordinate Co(ii)–nitrate complexes showing slow magnetic relaxation

Abstract

Two seven-coordinate Co(II)-nitrate complexes, [Co(tmpdc)(NO3)2] (1) and [Co(tmpdt)(NO3)2]·CH3CN (2) (tmpdc = N,N,N′,N′-tetramethyl-2,6-pyridinedicarboxamide, tmpdt = N,N,N′,N′-tetramethyl-2,6-pyridinedithiocarboxamide) with tridentate neutral ligands tmpdc or tmpdt have been prepared. Their crystal structures by single X-ray diffraction show markedly different coordination geometries when two donor atoms of the tridentate ligand change from oxygen in 1 to sulfur in 2. Complex 1 is a capped octahedral while complex 2 is a pentagonal bipyramid. Results of direct-current (dc) magnetic measurements and high-frequency electron paramagnetic resonance (HFEPR) indicate the anisotropic S = 3/2 spin ground state of the Co(II) ions with the easy-plane anisotropy for both 1 and 2. Frequency- and temperature-dependent alternating-current (ac) magnetic susceptibility studies reveal slow magnetic relaxation for 1 and 2 under applied fields.

Graphical abstract: Structures and magnetic anisotropies of two seven-coordinate Co(ii)–nitrate complexes showing slow magnetic relaxation

Supplementary files

Article information

Article type
Paper
Submitted
10 May 2023
Accepted
28 Jul 2023
First published
28 Jul 2023

New J. Chem., 2023,47, 15553-15560

Author version available

Structures and magnetic anisotropies of two seven-coordinate Co(II)–nitrate complexes showing slow magnetic relaxation

W. Lv, L. Chen, X. Chen, H. Yan, Z. Wang, Z. Ouyang and Z. Xue, New J. Chem., 2023, 47, 15553 DOI: 10.1039/D3NJ02160B

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