3- and 4-(α-diazobenzyl)pyridine-N-oxides as photoresponsive magnetic couplers for 2p–4f heterospin systems: formation of carbene–Tb<sup>III</sup> and carbene–Dy<sup>III</sup> single-molecule magnets
作者:Kensuke Murashima、Satoru Karasawa、Kenji Yoza、Yuji Inagaki、Noboru Koga
DOI:10.1039/c6dt00420b
日期:——
3- and 4-(α-diazophenyl)pyridine-N-oxides, 3- and 4-D1pyO, were prepared as new photoresponsive magnetic couplers in heterospin systems. Lanthanide dinuclear complexes, [LnIII(tta)3(4-D1pyO)]2; LnIII = Gd (1d), Tb (2d), and Dy (3d) and tta = 4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedionate, bridged with 4-D1pyO in μ2 coordination mode were obtained. The obtained 1d, 2d, and 3d were isostructures. The
制备3-和4-(α-重氮苯基)吡啶-N-氧化物3-和4-D1pyO,作为异旋系统中的新光敏磁性偶合剂。镧系双核络合物,[Ln III(tta)3(4-D1pyO)] 2;Ln III = Gd(1d),Tb(2d)和Dy(3d),tta = 4,4,4-三氟-1-(2-噻吩基)-1,3-丁二酸酯,与4-D1pyO以μ桥接获得了2种协调模式。所得的1d,2d和3d是同构。异构体,[Tb还制备了III(tta) 3( 3-D1pyO)] 2。在通过光解产生的卡宾-Ln III配合物[Ln III(tta) 3( 4-和3-C1pyO)] 2中, C1pyO通过吡啶-N-氧化物与Ln III离子区域选择性地相互作用,其中磁耦合为4 -C1pyO是弱铁磁性的,而3-C1pyO的则是微弱的。照射1d之前和之后,均未观察到SMM行为。相比之下,Tb III和Dy具有各向异性的III络合物起异旋SMM的