Multi-photon properties in various condensed phases of dendritic chromophores derived from carbazole and indenoquioxaline units: Synthesis and characterization
作者:Tzu-Chau Lin、Wei Chien、Shu-Wen Dai、Hao-Wu Lin、Yueh-Ching Liu
DOI:10.1016/j.dyepig.2019.04.044
日期:2019.9
We have used functionalized carbazoles and indenoquonoxalines as the main building units and enthynyl groups as the π-linkages to construct two novel dendritic fluorophores and studied their degenerate multi-photon absorption properties in both the solution phase and the neat-film state within femtosecond and nanosecond regions. In our experiments, these model compounds are found to manifest strong
Catenation and Aggregation of Multi-Cavity Coordination Cages
作者:Rongmei Zhu、Irene Regeni、Julian J. Holstein、Birger Dittrich、Miriam Simon、Sylvain Prévost、Michael Gradzielski、Guido H. Clever
DOI:10.1002/anie.201806047
日期:2018.10.8
A series of metal‐mediated cages, having multiple cavities, was synthesized from PdII cations and tris‐ or tetrakis‐monodentate bridging ligands and characterized by NMR spectroscopy, mass spectrometry, and X‐ray methods. The peanut‐shaped [Pd3L14] cage deriving from the tris‐monodentate ligand L1 could be quantitatively converted into its interpenetrated [5Cl@Pd6L18] dimer featuring a linear [Pd‐Cl‐]5Pd}
由Pd II阳离子和三齿或四齿单齿桥接配体合成了一系列具有多个腔的金属介导的笼,并通过NMR光谱,质谱和X射线方法进行了表征。源自三单齿配体L 1的花生形[Pd 3 L 1 4 ]笼可定量转化为其互穿的[5Cl @ Pd 6 L 1 8 ]线性二聚体[[Pd-Cl-] 5在添加氯阴离子后,Pd}堆积为空前的结构基序。小角度中子散射(SANS)实验表明,长度为3.7 nm的雪茄形组件通过己基侧链之间的疏溶剂相互作用聚集成直径为14 nm的单层圆盘。发现七阳离子[5Cl @ Pd 6 L 1 8 ]笼在聚集体溶于水的情况下与聚阴离子寡核苷酸双链相互作用,这使得该化合物类别对于基于非共价DNA结合的应用很感兴趣。
Engineering Solid-State Morphologies in Carbazole–Ethynylene Macrocycles
作者:Aaron D. Finke、Dustin E. Gross、Amy Han、Jeffrey S. Moore
DOI:10.1021/ja204795q
日期:2011.9.7
We present a crystallographic study that systematically investigates the effects of the n-alkyl side-chain length on the crystal packing in shape-persistent macrocycles. The solid-state packing of carbazole-ethynylene-containing macrocycles is sensitive to the alkyl-chain length. In macrocycles containing n-alkyl side chains up to nine carbons in length, face-on aromatic. pi interactions predominate, while the addition of one carbon leads to a completely different packing arrangement. Macrocycles with C-10 or C-11 chains exhibit a novel packing motif wherein the alkyl chains intercalate between macrocycles, leading in one case to continuous solvent-filled channels. When crystals of the C-10 macrocycle are bathed in solvent, the included molecules exchange with the external solvent, and the alkyl chain disorder changes in response to changes in the guest volume in order to retain crystallinity. Powder X-ray diffraction data indicate that alkyl-macrocycle interactions in the longer chains "emulate" the distances typical of face-to-face pi interactions, leading to deceptive indicators of pi stacking.