Tuning the magnetization dynamics of TbIII-based single-chain magnets through substitution on the nitronyl nitroxide radical. Issue 24 (30th May 2019)

• Record Type: Journal Article
• Authors: Liu, Xiaoqing; Wang, Yu-Xia; Han, Zongsu; Han, Tian; Shi, Wei; Cheng, Peng
• Is Part Of: Dalton transactions. Volume 48:Issue 24(2019)
• Page Start: 8989
• Page End: 8994
• Publication Date: 2019-05-30
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c9dt01704f
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : A minor change of the site of the substituent on the nitronyl nitroxide radical significantly influences the magnetization dynamics of two single-chain magnets, due to the influence of both the magnetic anisotropies of the Tb III centers and magnetic couplings along the chains. Abstract : Two one-dimensional nitronyl nitroxide radical (NITR)-bridged lanthanide chain compounds, namely [Tb(hfac)3 (NIT-4-ThienPh)] n (1 ) and [Tb(hfac)3 (NIT-5-ThienPh)] n (2 ), where hfac = hexafluoroacetylacetonate, NIT-4-ThienPh = 2-(4′-phenyl-2′-thienyl)-4, 4, 5, 5-tetramethyl-imidazoline-1-oxyl-3-oxide, and NIT-5-ThienPh = 2-(5′-phenyl-2′-thienyl)-4, 4, 5, 5-tetramethyl-imidazoline-1-oxyl-3-oxide, were obtained with different NITRs. Alternating-current magnetic susceptibility studies show that both the compounds are single-chain magnets, while a minor change of the site of the phenyl substituent on the NITR significantly influences the magnetization dynamics. The effective magnetization reversal barrier of1 (53 cm −1 ) is more than two times higher than that of2 (20 cm −1 ) and the coercive field of1 is also much higher than that of2 because of minor changes in the local coordination symmetry of the Tb III centers and the magnetic interactions between the spin carriers along the chain induced by substitution on the radical ligand.