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

   https://doi.org/10.1039/D3NJ02160B  

   Lv, Wei; Chen, Lei; Chen, Xue-Tai; Yan, Hong; Wang, Zhenxing; Ouyang, Zhong-Wen; Xue, Zi-Ling (August 2023, New Journal of Chemistry)

   Two seven-coordinate mononuclear Co(ii) complexes are proved to have field-induced magnetic relaxation and one of them possesses capped octahedral geometry. 

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2. Exploring different equatorial donors in a series of five-coordinate Cu(II) complexes supported by rigid tetradentate ligands

   https://doi.org/10.1016/j.poly.2021.115558  

   Devdass, Anthony; Talukdar, Kallol; Zeller, Matthias; Fortenberry, Ryan C.; Jurss, Jonah W. (January 2022, Polyhedron)
3. Magnetic anisotropy and slow magnetic relaxation processes of cobalt( ii )-pseudohalide complexes

   https://doi.org/10.1039/C9DT00644C  

   Cui, Hui-Hui; Zhang, Yi-Quan; Chen, Xue-Tai; Wang, Zhenxing; Xue, Zi-Ling (January 2019, Dalton Transactions)

   Three mononuclear six-coordinate Co( ii )-pseudohalide complexes [Co(L)X 2 ] with two N-donor pseudohalido coligands occupying the cis -positions (X = NCS − ( 1 ), NCSe − ( 2 ) or N(CN) 2 − ( 3 )), and a five-coordinate complex [Co(L)(NCO)][B(C 6 H 5 ) 4 ] ( 4 ) [L = 1,4,7,10-tetramethyl-1,4,7,10-tetraazacyclododecane (12-TMC)] have been prepared and structurally characterized. Easy-plane magnetic anisotropy for 1–3 and easy-axis anisotropy for 4 were revealed via the analyses of the direct-current magnetic data, high-frequency and -field EPR (HFEPR) spectra and ab initio theoretical calculations. They display slow magnetic relaxations under an external applied dc field. Typically, two slow relaxation processes were found in 1 and 2 while only one relaxation process occurs in 3 and 4 . The Raman-like mechanism is found to be dominant in the studied temperature range in 1 . For 2–4 , the Raman process is dominant in the low temperature region, while the Orbach mechanism dominates in the high temperature range. 

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4. Zero-Field Slow Magnetic Relaxation and Hysteresis Loop in Four-Coordinate Co ^II Single-Ion Magnets with Strong Easy-Axis Anisotropy

   https://doi.org/10.1021/acs.inorgchem.9b01175  

   Cui, Hui-Hui; Lu, Fang; Chen, Xue-Tai; Zhang, Yi-Quan; Tong, Wei; Xue, Zi-Ling (September 2019, Inorganic Chemistry)
5. Anionic guest-dependent slow magnetic relaxation in Co( ii ) tripodal iminopyridine complexes

   https://doi.org/10.1039/C9DT00739C  

   Klug, Christina M.; Ozumerzifon, Tarik J.; Bhowmick, Indrani; Livesay, Brooke N.; Rappé, Anthony K.; Shores, Matthew P. (June 2019, Dalton Transactions)

   We report the syntheses and magnetic property characterizations of four mononuclear cobalt( ii ) complex salts featuring a tripodal iminopyridine ligand with external anion receptor groups, [CoL 5-ONHtBu ]X 2 (X = Cl ( 1 ), Br ( 2 ), I ( 3 ) and ClO 4 ( 4 )). While all four salts exhibit anion binding through pendant amide moieties, only in the case of 1 is field-induced slow relaxation of magnetisation observed, whereas in the other salts this phenomenon is absent at the limits of our instrumentation. The effect of chloride inducing a seventh Co–N interaction and concomitant structural distortion is hypothesized as the origin of the observed dynamic magnetic properties observed in 1 . Ab initio computational studies carried out on a 7-coordinate Co( ii ) model species survey the complex interplay of coordination number and trigonal twisting on the sign and magnitude of the axial anisotropy parameter ( D ), and identify structural features whose distortions can trigger large switches in the sign and magnitude of magnetic anisotropy. 

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