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A cobalt(II)-nitronyl nitroxide single chain magnet with a record high blocking temperature and low coercivity
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2024-11-28 , DOI: 10.1039/d4qi02703e
Thomaz de A. Costa, Mihai Răducă, Julio C. Rocha, Miguel A. Novak, Rafael A. A. Cassaro, Marius Andruh, Maria G. F. Vaz
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2024-11-28 , DOI: 10.1039/d4qi02703e
Thomaz de A. Costa, Mihai Răducă, Julio C. Rocha, Miguel A. Novak, Rafael A. A. Cassaro, Marius Andruh, Maria G. F. Vaz
Two one-dimensional coordination polymers were synthesized: [M(hfac)2(9-PhentNIT)]n, where M = Mn (1) or Co (2), hfac− is hexafluoroacetylacetonato and 9-PhentNIT is a new stable nitronyl nitroxide organic radical, 2-(9-phenanthrenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide. These two complexes are isomorphous and crystallized with metal ions coordinated by two aminoxyl groups, arising from two bridging 9-PhentNIT radicals and two hfac− chelating ligands. The asymmetric unit has two independent metal(II) sites, resulting in two crystallographically independent chains. The investigation of their magnetic properties shows that both compounds form ferrimagnetic chains with strong antiferromagnetic coupling between S = 5/2 or 3/2 and 1/2 spin carriers. The anisotropic compound 2 shows the highest blocking temperature TB = 15.5 K reported so far for a single chain magnet (SCM) and exhibits magnetic hysteresis with low coercivity up to 22 K. In addition, we found evidence for magnetic irreversibility and relaxation of a small portion of long chains up to about 50 K.
中文翻译:
一种钴 (II)-硝基氮氧化物单链磁体,具有创纪录的高截止温度和低矫顽力
合成了两种一维配位聚合物:[M(hfac)2(9-PhentNIT)]n,其中 M = Mn (1) 或 Co (2),hfac− 是六氟乙酰基丙氧基,9-PhentNIT 是新的稳定硝基基氮氧化物有机自由基,2-(9-菲基)-4,4,5,5-四甲基咪唑啉-1-氧基-3-氧化物。这两个复合物是同构的,并与由两个氨基氧基配位的金属离子结晶,这两个氨基氧基由两个桥接 9-PhentNIT 自由基和两个 hfac− 螯合配体产生。不对称单元具有两个独立的金属 (II) 位点,从而产生两条晶体学上独立的链。对其磁性能的研究表明,这两种化合物在 S = 5/2 或 3/2 和 1/2 自旋载流子之间形成具有强反铁磁耦合的亚铁磁链。各向异性化合物 2 显示出迄今为止报道的单链磁体 (SCM) 的最高阻塞温度 TB = 15.5 K,并表现出高达 22 K 的低矫顽力磁滞。此外,我们还发现了磁不可逆性和一小部分长链松弛的证据,最高可达约 50 K。
更新日期:2024-11-28
中文翻译:
一种钴 (II)-硝基氮氧化物单链磁体,具有创纪录的高截止温度和低矫顽力
合成了两种一维配位聚合物:[M(hfac)2(9-PhentNIT)]n,其中 M = Mn (1) 或 Co (2),hfac− 是六氟乙酰基丙氧基,9-PhentNIT 是新的稳定硝基基氮氧化物有机自由基,2-(9-菲基)-4,4,5,5-四甲基咪唑啉-1-氧基-3-氧化物。这两个复合物是同构的,并与由两个氨基氧基配位的金属离子结晶,这两个氨基氧基由两个桥接 9-PhentNIT 自由基和两个 hfac− 螯合配体产生。不对称单元具有两个独立的金属 (II) 位点,从而产生两条晶体学上独立的链。对其磁性能的研究表明,这两种化合物在 S = 5/2 或 3/2 和 1/2 自旋载流子之间形成具有强反铁磁耦合的亚铁磁链。各向异性化合物 2 显示出迄今为止报道的单链磁体 (SCM) 的最高阻塞温度 TB = 15.5 K,并表现出高达 22 K 的低矫顽力磁滞。此外,我们还发现了磁不可逆性和一小部分长链松弛的证据,最高可达约 50 K。