Synthesis, characterization and X-ray crystal structures of cyclam derivatives. 7. Hydrogen-bond induced allosteric effects and protonation cooperativity in a macrotricyclic bisdioxocyclam receptor
Synthesis, characterization and X-ray crystal structures of cyclam derivatives. 7. Hydrogen-bond induced allosteric effects and protonation cooperativity in a macrotricyclic bisdioxocyclam receptor
Macrocyclic Ligand Design. A Large Covalently-Linked Ring System Incorporating Four Cyclam Units and its Interaction with Nickel(II), Copper(II), Zinc(II), and Cadmium(II)
作者:Ying Dong、Leonard F. Lindoy
DOI:10.1071/ch09312
日期:——
A cyclic, tetra-linked macrocyclic species incorporating four 1,4,8,11-tetraazacyclotetradecane (cyclam) subunits has been synthesized employing Boc amine-group protecting chemistry coupled with high dilution conditions for the cyclization step. A series of 4:1 (metal:ligand (M:L)) complexes with nickel(ii), copper(ii), zinc(ii), and cadmium(ii) has been synthesized. Visible spectophotometric (including
New heterotopic, linked macrocyclic systems derived from selectively protected macrocycles
作者:Jy D. Chartres、Leonard F. Lindoy、George V. Meehan
DOI:10.1016/j.tet.2006.02.012
日期:2006.4
orthogonally protected cyclam and 1,9-dithia-5,13-diazacyclohexadecane macrocycles, in combination with aza-18-crown-6, has enabled the efficient synthesis of a new heterotritopic macrocyclic ligand incorporating N4-, N2S2- and NO5-donor sites. A similar strategy has allowed the incorporation of cyclam and 1,9-dithia-5,13-diazacyclohexadecane into a cofacial ligand. Further, the synthesis of novel tetramacrocyclic
Formation of Heteropolynuclear Lanthanide Complexes Using Macrocyclic Phosphonated Cyclam-Based Ligands
作者:Richard C. Knighton、Lohona K. Soro、Thibault Troadec、Valerie Mazan、Aline M. Nonat、Mourad Elhabiri、Nathalie Saffon-Merceron、Saifou Djenad、Raphaël Tripier、Loïc J. Charbonnière
DOI:10.1021/acs.inorgchem.0c01456
日期:2020.7.20
photophysical data for these novel ligands and their complexes have been investigated, including a solid-state study by X-ray diffraction (L1, L2, and [EuL1H]), 1H NMR complexation investigations (Lu3+), as well as UV–vis absorption and luminescence spectroscopy in water and D2O (pH ≈ 7). L1 forms 1:1 metal–ligand stoichiometric octadentate complexes in solution. Importantly, the pyridyl phosphonate functions
描述了分别基于由6-膦酰基-2-亚甲基吡啶基在N1和N8官能化的Cyclam和交叉桥环的Cyclam支架的配体L 1和L 2。尽管不可能将镧系元素(Ln)阳离子与L 2络合,但已制备了具有通式[Ln L 1 H 2 ] Cl(Ln 3+ = Lu,Tb,Yb)或L 1的配合物。[Ln L 1 H](Ln 3+= Eu)。已经研究了这些新型配体及其配合物的溶液,结构,电位和光物理数据,包括通过X射线衍射(L 1,L 2和[Eu L 1 H]),1 H进行的固态研究。NMR络合研究(Lu 3+)以及水和D 2 O(pH≈7)中的UV-vis吸收和发光光谱。L 1在溶液中形成1:1的金属配体化学计量八齿配合物。重要的是,吡啶基膦酸酯官能团能够同时与金属中心螯合并与第二金属中心相互作用。1 H NMR(Lu3+)和EuCl 3盐分光光度滴定的分离的[Tb L 1 ] -配合物,表明在水溶液(H 2
Azonia spiro polyaza macrocycles containing biphenyl subunits as anion and cation receptors
作者:M. Isabel Burguete、M. Paz Clares、Enrique García-España、Santiago V. Luis、Manel Querol、Vicente Martí-Centelles
DOI:10.1016/j.tet.2011.04.071
日期:2011.6
The properties of 3 as a receptor for Cu2+ and Zn2+ and the anions derived from PO43−(Pi),P2O74−(PPi),P3O105−(TPP) and ATP have been studied by pH-metric titrations carried out in aqueous solution. While Cu2+ forms a CuL2+ complex and two hydroxylated species of moderate stability, Zn2+ forms only hydroxylated complexes. The association constants obtained for the 1:1 A:L anion complexes denote significant
Cyclam-strapped porphyrins and their iron(III)–copper(II) complexes as models for the resting state of cytochrome c oxidase
作者:Bruno Andrioletti、David Ricard、Bernard Boitrel
DOI:10.1039/a905251h
日期:——
The ESR study of two cyclam-strapped porphyrins in which, on one side, the cyclam is attached with a variable length linker to the porphyrin and, on the other side, a non-coordinating strap protects the iron from any intermolecular interaction, is reported. Variation of the linker length is made possible by the use of either a Michael reaction or a nucleophilic substitution, leading respectively to