A metal-radical hetero-tri-spin SCM with methyl–pyrazole–nitronyl nitroxide bridges. Issue 34 (11th August 2021)

• Record Type: Journal Article
• Authors: Huang, Xiaohui; Wang, Kang; Han, Jing; Xie, Junfang; Li, Licun; Sutter, Jean-Pascal
• Is Part Of: Dalton transactions. Volume 50:Issue 34(2021)
• Page Start: 11992
• Page End: 11998
• Publication Date: 2021-08-11
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1dt02006d
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : A novel 2p–3d–4f SCM has been successfully achieved using a pyrazole substituted nitronyl nitroxide which exhibits dual relaxation processes. Abstract : The preparation, crystal structures, and magnetic properties of a family of hetero-tri-spin 1-D coordination polymers with the formula [Ln(hfac)3 Cu(hfac)2 (4-NIT-MePyz)2 ] (Ln = Gd, 1, Tb, 2, Dy, 3 ; hfac = hexafluoroacetylacetonate; 4-NIT-MePyz = 2-{4-(1-methyl)-pyrazolyl}-4, 4, 5, 5-tetramethylimidazoline-1-oxyl-3-oxide) are reported. In these complexes, the 4-NIT-MePyz radical acts as a linker to bridge the Cu II and Ln III ions through its pyrazole and aminoxyl groups to form a chain structure. Magnetic properties typical of spin-chains are observed for Dy and Tb derivatives but single-chain magnet (SCM) behavior was evidenced only for the Tb compound which is characterized by an energy gap for demagnetization Δ τ / k B of 31 K.