Observation of Slow Relaxation and Single-Molecule Toroidal Behavior in a Family of Butterfly-Shaped Ln<sub>4</sub>Complexes
作者:Sourav Biswas、Sourav Das、Tulika Gupta、Saurabh Kumar Singh、Michael Pissas、Gopalan Rajaraman、Vadapalli Chandrasekhar
DOI:10.1002/chem.201603640
日期:2016.12.19
isostructural butterfly complexes with a tetranuclear [Ln4] core of the general formula [Ln4(LH)2(μ2‐η1η1Piv)(η2‐Piv)(μ3‐OH)2]⋅x H2O⋅y MeOH⋅z CHCl3 (1: Ln=DyIII, x=2, y=2, z=0; 2: Ln=TbIII, x=0, y=0, z=6; 3: Ln=ErIII, x=2, y=2, z=0; 4: Ln=HoIII, x=2, y=2, z=0; 5: Ln=YbIII, x=2, y=2, z=0; LH4=6‐[bis(2‐hydroxyethyl)amino]methyl}‐N′‐(2‐hydroxy‐3‐methoxybenzylidene)picolinohydrazide; PivH=pivalic acid) was isolated
五个同构蝴蝶络合物一族具有四核[LN 4 ]通式芯[LN 4(LH)2(μ 2 -η 1 η 1 PIV)(η 2 -Piv)(μ 3 -OH)2 ] ⋅ X ħ 2 O⋅ ý MeOH⋅ ž 氯仿3(1:LN =镝III,X = 2,ÿ = 2,ž = 0; 2:LN = TB III,X = 0,ÿ = 0,ž = 6 ;3:Ln = Er III,x= 2,y= 2,z= 0;4:L n = Ho III,x= 2,y= 2,z= 0;5:Ln = Yb III,x= 2,y= 2,z= 0;LH 4= 6-[[双(2-羟乙基)氨基]甲基} -N ′-(2-羟基-3-甲氧基亚苄基)吡啶并酰肼;分离(PivH =新戊酸)并在结构和磁性上进行表征。1至5号综合大楼通过直流和交流(dc和ac)磁化率测量对它们进行了探测,除1之外,它们均未显示出单分子磁性(SMM)行为。交流磁化率测量