在这里,我们探索了嵌入四齿 N 3 C 大环配体支架中的铁的内在有机金属反应性,该支架可以稳定芳基-Fe 物种,这是 Fe 催化的交叉偶联和 C-H 官能化过程中的关键中间体。本研究涵盖了使用Me L H和 FeCl 2的 C-H 活化反应,通过与格氏试剂反应形成联芳基 C- C偶联产物,以及使用Me L Br或H L Br与 Fe 0 (CO ) 5. 在光照和适度加热 (50 °C) 下合成得到芳基-Fe II配合物 [Fe II (Br)( Me L )(CO)] ( 1 Me ) 和 [Fe II ( H L )(CO) 2 ]溴 ( 1 H )。这些稀有的低自旋抗磁性物质的详尽光谱表征,包括它们的晶体结构,允许研究它们的内在反应性。
The synthesis of nine macrocyclic polyamines 2-10 containing pyridineunits is described. These compounds are 22- (9), 24- (2-4,6,8,10), or 26- (5, 7) membered hexaaza (2,3,9,10) or octaaza (4–7) macrocycles in which one to four pyridineunits are incorporated. Compounds 3,4,9, and 10 are homoditopic ligands, whereas 2 and 5 are heteroditopic and 6−8 multitopic receptors. Compounds 2-10 are potential
Synthesis and Characterisation of the Sodium and Lithium Cryptates of Macrobicyclic Ligands incorporating pyridine, bipyridine, and biisoquinoline units
of the macrabicyclic ligands 1–11 containing pyridine, bipyridine, and biisoquinoline groups. They involve stepwise construction of the bicyclic system as will as direct macrobicyclisation procedures (Scheme 1) and give access to both symmetrical and dissymmetrical structures. Marked cation template effects have been found that facilitate the cyclisation processes. The ligands 1–11 were isolated as
Improved synthesis of a C3-symmetrical pyridinophane
作者:Claire Nolan、Thorfinnur Gunnlaugsson
DOI:10.1016/j.tetlet.2008.01.077
日期:2008.3
The formation of the C3-symmetrical 2,11,20-triaza[3.3.3](2,6)pyridinophane 1 was undertaken with the aim of improving the synthesis of this highly desirable macrocycle, with the future aim of functionalizing 1 with amide pendent arms for the recognition of lanthanide ions. The synthesis of 1 involves the stepwise transformation of pyridine-2,6-dicarboxylic acid into two key intermediates; N,N-bis
Improved synthesis of symmetrically & asymmetrically <i>N</i>-substituted pyridinophane derivatives
作者:Andrew J. Wessel、Jason W. Schultz、Fengzhi Tang、Hui Duan、Liviu M. Mirica
DOI:10.1039/c7ob02508d
日期:——
multi-gram scale output of TsN4·HCl. This optimized synthesis of TsN4 also led to the development of symmetric RN4 derivatives as well as the asymmetric derivative N-(tosyl)-2,11-diaza[3,3](2,6)pyridinophane (TsHN4). Using this TsHN4 precursor, different N-substituents can be added to create a library of asymmetric RR′N4 macrocyclic ligands. These asymmetric RR′N4 derivatives expand the utility of the RN4 framework
Lanthanide Complexes Based on a Diazapyridinophane Platform Containing Picolinate Pendants
作者:Adrián Roca-Sabio、Célia S. Bonnet、Marta Mato-Iglesias、David Esteban-Gómez、Éva Tóth、Andrés de Blas、Teresa Rodríguez-Blas、Carlos Platas-Iglesias
DOI:10.1021/ic301369z
日期:2012.10.15
(H2BPDPA), was prepared, and its coordination properties toward the LnIII ions were investigated. The hydration numbers (q) obtained from luminescence lifetime measurements in aqueoussolution of the EuIII and TbIII complexes indicate that they contain one inner-sphere watermolecule. The structure of the complexes in solution has been investigated by 1H and 13C NMR spectroscopy, as well as by theoretical
制备了一种新的大环配体N,N'-双[(6-羧基-2-吡啶基)甲基] -2,11-二氮杂[3.3](2,6)吡啶并(H 2 BPDPA)研究了对Ln III离子的性能。从Eu III和Tb III配合物的水溶液中的发光寿命测量得出的水合数(q)表明它们包含一个内球水分子。溶液中配合物的结构已通过1 H和13进行了研究13 C NMR光谱以及在密度泛函理论(B3LYP)级别上进行的理论计算。通过对Yb III诱导的顺磁1 H位移的分析证明,为Yb III络合物计算的最小能量构象与溶液中的实验结构高度吻合。记录在Gd III配合物溶液上的核磁弛豫弥散(NMRD)曲线和17 O NMR测量值用于确定控制弛豫率的参数。结果表明,该系统具有相对较快的水交换速率k ex 298 = 63×10 6 s –1。热力学稳定性常数是通过在0.1 M KCl中于25°C的pH电位滴定法测定的。稳定常数落在log