TETRACATIONIC CYCLOPHANES AND THEIR USE IN THE SEQUESTRATION OF POLYAROMATIC HYDROCARBONS BY WAY OF COMPLEXATION
申请人:Stoddart J. Fraser
公开号:US20140179017A1
公开(公告)日:2014-06-26
Novel tetracationic cyclophanes incorporating π-electron poor organic compounds into their ring structures, as well as methods of making the cyclophanes, are provided. The cyclophanes are able to form electron donor-acceptor complexes with a variety of polyaromatic hydrocarbons (PAHs) ranging in size, shape, and electron density. Also provided are methods of using the cyclophanes in the sequestration of PAHs in liquid or gaseous samples, the separation of PAHs from liquid or gaseous samples, the detection of PAHs in liquid samples, and the exfoliation of graphene via pseudopolyrotaxane formation.
Elaboration of Diaryl Ketones into Naphthalenes Fused on Two or Four Sides: A Naphthoannulation Procedure
作者:Patrick M. Donovan、Lawrence T. Scott
DOI:10.1021/ja038254i
日期:2004.3.1
Transitionmetal-catalyzed double ring closures of 1,1-diaryl-2,2-diethynylethylenes yield polycyclic aromatic hydrocarbons and heterocycles that contain a newly formed naphthalene ring system embedded in a larger polycyclic network. The diynes required for this procedure are readily synthesized from diaryl ketones by the Corey-Fuchs olefination and subsequent Sonogashira coupling with trimethylsilylacetylene
Radiaannulenes: synthesis, electrochemistry, and solid-state structure
作者:Mojtaba Gholami、Manuel N. Chaur、Myron Wilde、Michael J. Ferguson、Robert McDonald、Luis Echegoyen、Rik R. Tykwinski
DOI:10.1039/b904762j
日期:——
Two new carbon-rich macrocycles (radiaannulenes) have been synthesized, and they possess an unsaturated carbon framework that is intermediate between that of linearly-conjugated dehydrobenzannulenes and cross-conjugated expandedradialenes.
ExBox: A Polycyclic Aromatic Hydrocarbon Scavenger
作者:Jonathan C. Barnes、Michal Juríček、Nathan L. Strutt、Marco Frasconi、Srinivasan Sampath、Marc A. Giesener、Psaras L. McGrier、Carson J. Bruns、Charlotte L. Stern、Amy A. Sarjeant、J. Fraser Stoddart
DOI:10.1021/ja307360n
日期:2013.1.9
A template-directed protocol, which capitalizes on donor acceptor interactions, is employed to synthesize a semi-rigid cyclophane (ExBox(4+)) that adopts a box-like geometry and is comprised of pi-electron-poor 1,4-phenylene-bridged ("extended") bipyridinium units (ExBIPY(2+)). ExBox(4+) functions as a high-affinity scavenger of an array of different polycyclic aromatic hydrocarbons (PAHs), ranging from two to seven fused rings, as a result of its large, accommodating cavity (approximately 3.5 angstrom in width and 11.2 angstrom in length when considering the van der Waals radii) and its ability to form strong non-covalent bonding interactions with pi-electron-rich PAHs in either organic or aqueous media. In all, 11 PAH guests were observed to form inclusion complexes with ExBox(4+), with coronene being the largest included guest. Single-crystal X-ray diffraction data for the 11 inclusion complexes EaBox(4+)subset of PAH as well as UV/vis spectroscopic data for 10 of the complexes provide evidence of the promiscuity of ExBox(4+) for the various PAHs. Nuclear magnetic resonance spectroscopy and isothermal titration calorimetric analyses of 10 of the inclusion complexes are employed to further characterize the host guest interactions in solution and determine the degree with which ExBox(4+) binds each PAR compound. As a proof-of-concept, a batch of crude oil from Saudi Arabia was subjected to extraction with the water-soluble form of the PAH receptor, ExBox center dot 4Cl, resulting in the isolation of different aromatic compounds after ExBox center dot 4Cl was regenerated.
Assembly of organosilver coordination frameworks with aromatic ligands bearing a terminal enediyne group
作者:Sam C.K. Hau、Thomas C.W. Mak
DOI:10.1016/j.poly.2013.02.020
日期:2013.11
In a series of five silver(I) complexes synthesized with (2-ethynylbut-1-en-3-yne-1,1-diyl)dibenzene (H(2)L1) and 9-(penta-1,4-diyn-3-ylidene)-9H-fluorene (H2L2), each resulting ethynide ligand is invariably inserted into a Ag-n (n = 3-4) basket, leading to the generation of coordination chains or multinuclear metallocycles, but the well shielded ethenyl group does not take part in silver-olefin binding. In (Ag(2)L1)center dot 9AgCF(3)CO(2)center dot 3H(2)O center dot 3CH(3)CN and (Ag(2)L1)(2)center dot 9AgCF(3)CO(2).11H(2)O, which can be crystallized in different polar protic solvent media, an infinite chain composed of metallocycles is favorably generated with the assistance of silver-aromatic interaction; such chains are further interconnected to form a two- or three-dimensional organosilver network. In (Ag2L2)center dot 5AgCF(3)CO(2)center dot 5DMSO, the fluorenyl group does not participate in silver-aromatic interaction; however, its planar skeleton directs the construction of a more closely packed metal-organic coordination chain. (C) 2013 Elsevier Ltd. All rights reserved.