Rational Enantioselective Design of Chiral Heterobimetallic Single-Chain Magnets: Synthesis, Crystal Structures and Magnetic Properties of Oxamato-Bridged MIICuII Chains (M=Mn, Co)
作者:Jesús Ferrando-Soria、Danielle Cangussu、Mercedes Eslava、Yves Journaux、Rodrigue Lescouëzec、Miguel Julve、Francesc Lloret、Jorge Pasán、Catalina Ruiz-Pérez、Elsa Lhotel、Carley Paulsen、Emilio Pardo
DOI:10.1002/chem.201101459
日期:2011.10.24
enantiopure CoIICuII chains (1 b and 2 b) show slow magnetic relaxation at low temperatures (TB=0.6–1.8 K), which is a characteristic of single‐chain magnets (SCMs) and is related to the magnetic anisotropy of the high‐spin CoII ion. Analysis of the SCM behaviour of 1 b and 2 b, based on Glauber’s theory for an Ising one‐dimensional system, shows a thermally activated mechanism for the magnetic relaxation (Arrhenius
一系列新的中性oxamato桥接中号II的Cu II通式[MCuL的手性链X(S)米(H 2 O)Ñ ] ⋅一个小号⋅ b ħ 2 ö[L 1 =(中号)-1,1-具有M = Mn(1 a)和Co(1 b)的'-萘二萘-2,2'-双(草酸酯); L 2 =(P)-1,1'-联萘-2,2'-双(草酸酯),其中M = Mn(2 a)和Co(2 b)]和式[MCuL 3(S )米(高2O)Ñ ] ⋅一个小号⋅ b ħ 2 ö[L 3 = 1,1'-联二萘-2,2'-双(草氨酸乙酯)其中M =锰(3)和Co(图3b)]已经制备相应的双阴离子恶唑铜(II)配合物[Cu(L x)] 2−与Mn 2+或Co 2+的反应二甲基甲酰胺(DMF)或二甲基亚砜(DMSO)中的阳离子。记录双金属链化合物的固态圆二色性(CD)光谱以建立其手性和对映体性质。它们表现出最大的棉花正负效应,每对对映体链都是不可叠加的镜像。Mn