Three powerful dinuclear metal–organic catalysts for converting CO<sub>2</sub> into organic carbonates
作者:Dan Zhao、Xiao-Hui Liu、Zhuang-Zhi Shi、Chen-Dan Zhu、Yue Zhao、Peng Wang、Wei-Yin Sun
DOI:10.1039/c6dt02755e
日期:——
NH2-functionalized tripodal ligand 2-((bis(2-aminoethyl)amino)methyl)phenol (HL), three dinuclear metal–organic complexes [Zn(L)]2·2ClO4 (1), [Cu(L)]2·2ClO4·2H2O (2) and [Cd(L)]2·2ClO4 (3) have been successfully isolated and structurally characterized using single-crystal X-ray diffraction analyses. Considering the dinuclear metal centers and the NH2-functional groups in the structures, 1–3 were investigated as
give the related f,f homodinuclear [Ln 2 (L)-(X) 2] and f,f' heterodinuclear [LnLn'(L)(X) 2 ] or d,f heterodinuclear [LnM(L)(X)] complexes. They have been characterized by ESEM-EDS, ESI-MS, and IR and 1 H and 13 C NMR spectroscopy. The X-ray single-crystal analysis of the [2+1] acyclic complex [Lu 2 (L') 2 ], derived from partial hydrolysis of the related [2+2] homodinuclearcomplex [Lu 2 (L)(Cl) 2 ]
[2+2] 隔室大环复合物 [Ln(H 2 -L)-(NO 3 )],其中 H 2 -L 是环状席夫碱,衍生自 2,6-二甲酰基-4-氯苯酚 ( H A ) 或 2,6-二甲酰基-4-甲基苯酚 (HL B ) 和 N,N-双(2-氨基乙基)-2-羟基苄胺·3HCl (HA'·3HCl),包含一个游离的 N 3 0 3 配位室并且可以作为相同或不同镧系元素 (III) 离子和过渡金属 (II) 离子的配体,产生相关的 f,f 同双核 [Ln 2 (L)-(X) 2] 和 f,f'异双核 [LnLn'(L)(X) 2 ] 或 d,f 异双核 [LnM(L)(X)] 复合物。它们已通过 ESEM-EDS、ESI-MS、IR 和 1 H 和 13 C NMR 光谱进行表征。[2+1]无环配合物[Lu 2 (L') 2 ]的X射线单晶分析,
Dinuclear Lanthanide Complexes Based on a Schiff-base Ligand: Free Lattice Solvent Inducing the Single Molecule Magnet Behavior of Dy<sub>2</sub>
Compound
existence of free MeCN molecule in 2–7. The purposeful introduction of solvent MeCN molecule changes the crystal system from triclinic for 1 to monoclinic for 2 and alters the Dy—O–Dy angles and Dy⋅⋅⋅Dy distances, consequentially resulting into dramatic influences on the magnetic properties of 1 and 2. Complex 1 shows no SMM character, while compound 2 with free MeCN molecule exhibits a field‐induced
Synthesis, crystal structure and properties of a macrocyclic dinuclear manganese(II) complex with functional o-methylenephenolic pendant arms
作者:Ming Qian、Shaohua Gou、Zhi Yu、Huangxian Ju、Yan Xu、Chunying Duan、Xiaozeng You
DOI:10.1016/s0020-1693(01)00326-7
日期:2001.5
A dinuclear manganese macrocyclic complex with functional pendant arms, [Mn-2(II)HL2](ClO4), has been prepared by the cyclocondensation of sodium 2,6-diformyl-4-methylphenolate with N,N-bis(2-aminoethyl)-N-(2-hydroxybenzyl)amine and subsequent transmetallation of Mn(II)(ClO4)(2). In the molecular structure of the complex, each pendant arm is bound to an adjacent manganese atom and both arms lie on the same side of the resulting tetra-imine macrocycle. Each manganese(II) ion is in a distorted octahedral configuration. The variable-temperature magnetism and the cyclic voltammogram of the complex have also been investigated. In the catalytic study, this compound exhibits a high activity for catalyzing disproportionation of H2O2 to O-2. (C) 2001 Elsevier Science B.V. All rights reserved.
A series of dinuclear lanthanide complexes derived from a hydroxyl-rich ligand: {Dy2} exhibiting single-molecule magnet behaviour
Seven dinuclear lanthanide complexes of formulae Ln(2)L(2) (Ln = Sm (1), Eu (2), Gd (3), Tb (4), Dy (5)), Ho2L2 center dot MeCN (6) and Er2L2 center dot MeCN (7) (H3L = 2-[bis(2-hydroxy-3-ethoxybenzyl)(aminoethyl)amino] methyl)phenol) have been synthesized by the reactions of Ln(NO3)(3)center dot 6H(2)O with the hydroxyl-rich ligand H3L in MeCN/NEt3 solution. The structures of the isostructural complexes 1-7 were determined by single-crystal X-ray crystallography. X-ray crystallography analyses reveal that each compound is neutral and consists of two metal centers and two triply-deprotonated ligands. The two Ln(III) atoms in 1-7 are doubly bridged by two phenolato oxygen atoms of two L(3-)ligands. Each of the two lanthanide ions is seven-coordinated and possesses capped trigonal prism geometry. Dc magnetic susceptibility studies in the 2-300 K range reveal probably weak antiferromagnetic interaction for 3-7. Complex 5 exhibits frequency dependence of the ac-susceptibility typical of single-molecule magnets. (C) 2018 Elsevier Ltd. All rights reserved.