Complexation and Dynamic Switching Properties of Fluorophore-Appended Resorcin[4]arene Cavitands
作者:Laura D. Shirtcliff、Hai Xu、François Diederich
DOI:10.1002/ejoc.200901174
日期:2010.2
unexpectedly large conformational flexibility of the cavitand structures both in the vase and kite forms, which was further confirmed by molecular dynamics simulations. Excimer formation is most preferred in [D 12 ]mesitylene when the cavities are empty, whereas efficient solvation or guest binding in the interior spaces reduces the propensity for excimer formation. The observed high conformational flexibility
Triptycene-Roofed Quinoxaline Cavitands for the Supramolecular Detection of BTEX in Air
作者:Federico Bertani、Nicolò Riboni、Federica Bianchi、Giovanna Brancatelli、Elizabeth S. Sterner、Roberta Pinalli、Silvano Geremia、Timothy M. Swager、Enrico Dalcanale
DOI:10.1002/chem.201504229
日期:2016.3.1
Two novel triptycene quinoxaline cavitands (DiTriptyQxCav and MonoTriptyQxCav) have been designed, synthesized, and applied in the supramolecular detection of benzene, toluene, ethylbenzene, and xylenes (BTEX) in air. The complexation properties of the two cavitands towards aromatics in the solid state are strengthened by the presence of the triptycene moieties at the upper rim of the tetraquinoxaline
Synthesis and Conformational Switching of Partially and Differentially Bridged Resorcin[4]arenes Bearing Fluorescent Dye Labels. Preliminary Communication
作者:Vladimir A. Azov、François Diederich、Yoriko Lill、Bert Hecht
DOI:10.1002/hlca.200390172
日期:2003.6
of modified Cram-type cavitands bearing one or two fluorescent labels for single-molecule spectroscopic studies of vasekite conformational switching (Scheme 3). Syntheses were performed by stepwise bridging of the four couples of neighboring H-bonded OH groups of resorcin[4]arene bowls (Schemes 2 and 3). The new substitution patterns enable the construction of a large variety of future functional architectures
Cycloalkane and Alicyclic Heterocycle Complexation by New Switchable Resorcin[4]arene-Based Container Molecules: NMR and ITC Binding Studies
作者:Jens Hornung、Daniel Fankhauser、Laura D. Shirtcliff、Antonia Praetorius、W. Bernd Schweizer、François Diederich
DOI:10.1002/chem.201101861
日期:2011.10.24
The synthesis and structural characterization of novel, “molecularbasket”‐type bridged cavitands is reported. The resorcin[4]arene‐based containermolecules feature well‐defined cavities that bind a wide variety of cycloalkanes and alicyclic heterocycles. Association constants (Ka) of the 1:1 inclusion complexes were determined by both 1H NMR and isothermal titration calorimetry (ITC). The obtained
报道了新型“分子篮”型桥接空泡的合成和结构表征。基于间苯二酚[4]芳烃的容器分子具有明确定义的空腔,可结合多种环烷烃和脂环族杂环。通过1 H NMR和等温滴定量热法(ITC)确定1:1包合物的缔合常数(K a)。所获得的均三甲苯中的K a值的范围从对于环庚烷的1.7×10 2 M -1到对于吗啉的1.7×10 7 M -1。分子篮的主客体络合通常是由分散相互作用驱动的,C 客体与空腔的芳香壁的H⋅⋅⋅π相互作用,以及最佳的空腔填充。基于NMR的结构数据和结合亲和力之间的相关性支持络合杂环客人进行额外的极性c- O⋅⋅⋅CO,N H⋅⋅⋅π,和S⋅⋅⋅π相互作用。报告了基于cavitand的分子篮的第一个晶体结构,可提供有关固态内腔几何形状和体积的精确信息。分子动力学(MD)模拟提供了有关存在被包封的客体时空腔的大小和构象预组织的信息。在63±9%的空腔填充量下,观察到与客体极性相互作用的杂环客体最强结合。
Reversibly controllable guest binding in precisely defined cavities: selectivity, induced fit, and switching in novel resorcin[4]arene-based container molecules
作者:Thomas Gottschalk、Peter D. Jarowski、François Diederich
DOI:10.1016/j.tet.2008.04.102
日期:2008.9
Two molecularbaskets are presented, which were constructed based on a resorcin[4]arene platform. The molecules completely surround suitable guests, such as cyclo- or oxacycloalkanes, and bind them with high strength. The thermodynamic parameters for inclusion complexation were determined as well as the influence of encapsulation on the ring inversion barrier of bound cyclohexane. Two-dimensional NMR