庞大的双齿配体用于稳定大环[Fe III 8 Co II 6 ]团簇。通过用一个或两个甲氧基衍生化来调节配体的碱性,分别导致分离出同源的[Fe III 8 Co II 6 ]和[Fe III 6 Fe II 2 Co III 2 Co II 2 ]配合物。降低反应温度可以分离[Fe III 6 Fe II 2 Co III 2 Co II 2]与所有三个配体簇集。与温度相关的吸收数据和铁/镍体系的相应实验表明,铁/钴的自组装过程是由溶液状态电子转移耦合自旋跃迁(ETCST)的发生及其对反应中间不稳定性的影响所决定的。
complexes of [Fe8M6(μ‐CN)14(CN)10 (tp)8(HL)10(CH3CN)2][PF6]4⋅n CH3CN⋅m H2O (HL=3‐(2‐pyridyl)‐5‐[4‐(diphenylamino)phenyl]‐1H‐pyrazole), tp−=hydrotris(pyrazolylborate), 1: M=Ni with n=11 and m=7, and 2: M=Co with n=14 and m=5) were prepared. Complexes 1 and 2 are isomorphous, and crystallized in the monoclinic space group P21/n. They have tetradecanuclear cores composed of eight low‐spin (LS) FeIII and
Lability-Controlled Syntheses of Heterometallic Clusters
作者:Graham N. Newton、Kiyotaka Mitsumoto、Rong-Jia Wei、Fumichika Iijima、Takuya Shiga、Hiroyuki Nishikawa、Hiroki Oshio
DOI:10.1002/anie.201309374
日期:2014.3.10
ligand was used to stabilize a macrocyclic [FeIII8CoII6] cluster. Tuning the basicity of the ligand by derivatization with one or two methoxy groups led to the isolation of a homologous [FeIII8CoII6] species and a [FeIII6FeII2CoIII2CoII2] complex, respectively. Lowering the reaction temperatures allowed isolation of [FeIII6FeII2CoIII2CoII2] clusters with all three ligands. Temperature‐dependent absorption
庞大的双齿配体用于稳定大环[Fe III 8 Co II 6 ]团簇。通过用一个或两个甲氧基衍生化来调节配体的碱性,分别导致分离出同源的[Fe III 8 Co II 6 ]和[Fe III 6 Fe II 2 Co III 2 Co II 2 ]配合物。降低反应温度可以分离[Fe III 6 Fe II 2 Co III 2 Co II 2]与所有三个配体簇集。与温度相关的吸收数据和铁/镍体系的相应实验表明,铁/钴的自组装过程是由溶液状态电子转移耦合自旋跃迁(ETCST)的发生及其对反应中间不稳定性的影响所决定的。
Dimerized Spin‐Crossover Iron(II) Complexes as Supramolecular Anion Capsules
作者:Takuya Shiga、Emiko Oshiro、Naoko Nakayama、Kiyotaka Mitsumoto、Graham N. Newton、Hiroyuki Nishikawa、Hiroki Oshio
DOI:10.1002/ejic.201201365
日期:2013.2.18
Two dimerizediron(II) complexes, [Fe(L)(HL)2}Fe(HL)3}](PF6)(BF4)2·5CH3CN·4H2O (1) and [Fe(L)(HL)2}Fe(HL)3}](PF6)(FeCl4)2 (2) HL = 3-(2-pyridyl)-5-[4-(diphenylamino)phenyl]-1H-pyrazole}, supported by triphenylamine-derivatized bidentate ligands and encapsulating hexafluorophosphate ions were synthesized. The complexiron ions have octahedral coordination geometries in which they interact with
两种二聚铁 (II) 配合物,[Fe(L)(HL)2}Fe(HL)3}](PF6)(BF4)2·5CH3CN·4H2O (1) 和 [Fe(L)(HL) )2}Fe(HL)3}](PF6)(FeCl4)2 (2) HL = 3-(2-pyridyl)-5-[4-(diphenylamino)phenyl]-1H-pyrazole},由合成了三苯胺衍生的双齿配体和封装的六氟磷酸根离子。复杂的铁离子具有八面体配位几何结构,其中它们与来自三个双齿配体的六个氮原子相互作用。两种化合物都具有胶囊状二聚化超分子结构,其中两个离散单核复合物的庞大配体的排列形成了一个中心腔,其中捕获了单个六氟磷酸根离子。双齿配体通过配体吡唑部分的氢原子与阴离子客体分子相互作用。低温磁性研究表明,这两种化合物都表现出自旋交叉行为。复合物 1 在 200-300 K 附近显示出准可逆的自旋交叉,受去溶剂化效应的阻碍,而