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Field-Induced Slow Magnetic Relaxation of a Six-Coordinate Mononuclear Manganese(II) and Cobalt(II) Oxamate Complexes

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journal contribution
posted on 08.09.2020, 14:20 by Tamyris T. da Cunha, Vitor M. M. Barbosa, Willian X. C. Oliveira, Emerson F. Pedroso, Diana M. A. García, Wallace C. Nunes, Cynthia L. M. Pereira
Two air-stable, isostructural, mononuclear six-coordinate manganese­(II) and cobalt­(II) oxamate complexes, [M(4-HOpa)2(H2O)2] [4-HOpa = N-4-hydroxyphenyloxamate; M= Mn2+ (1) or Co2+ (2)], exhibit field-induced slow magnetic relaxation. A bottleneck process is observed throughout the temperature range of 2–20 K for 1, while for 2, it dominates only at low temperatures (2–4 K). Additionally, the Raman process [n = 6.9(2)] is responsible for an increase in the relaxation time at higher temperatures to 2.