1. Structures and magnetic anisotropies of two seven-coordinate Co(II)–nitrate complexes showing slow magnetic relaxation.
- Author
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Lv, Wei, Chen, Lei, Chen, Xue-Tai, Yan, Hong, Wang, Zhenxing, Ouyang, Zhong-Wen, and Xue, Zi-Ling
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MAGNETIC structure , *MAGNETIC relaxation , *MAGNETIC anisotropy , *ELECTRON paramagnetic resonance , *MAGNETIC measurements , *ATOMS , *MAGNETIC susceptibility - 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. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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