Molecular Meccano. 2. Self-Assembly of [n]Catenanes
摘要:
The mutual molecular recognition between different: structural components in large rings has led to the template-directed synthesis of a wide range of catenanes composed of from two to five interlocked rings, The molecular self-assembly processes rely upon the recognition between (i) pi-electron rich and pi-electron deficient aromatic units and (ii) hydrogen bond donors and accepters, in the different components. In order to increase Our knowledge of the factors involved in such molecular self-assembly processes, a homologous series of [2]catenanes has been constructed using macrocyclic polyethers of the bis(p-phenylene)-(3n+4)-crown-n (n = 9-14) type as templates for the formation of the tetracationic cyclophane, cyclobis(paraquat-p-phenylene). Increasing the size of the tetracationic cyclophane to cyclobis(paraquat-4,4'-bitolyl) allows the simultaneous entrapment of two hydroquinone ring-containing macrocyclic polyethers affording a series of [3]catenanes, and one [4]catenane incorporating a cyclic dimer of the expanded cyclophane and three bis(p-phenylene)-34-crown-10 components. By analogy; increasing the number of hydroquinone rings in the macrocyclic polyether permits the self-assembly of more than one tetracationic cyclophane around the templates present in the macrocyclic polyether. In this context, the template-directed synthesis of two [3]catenanes, incorporating two cyclobis(paraquat-p-phenylene) components and either (i) tris(p-phenylene)51-crown-15 or (ii) tetrakis (p-phenylene)-68-crown-20, has been achieved and is reported. A combination of these two approaches has led to the successful self-assembly, in two steps, of a linear [4]catenane, together with a small amount of a [5]catenane: The creation of these intricate molecular compounds lends support to the contention that self-assembly is a viable paradigm for the construction of nanometer-scale molecular architectures incorporating a selection of simple components.
Complex formation between bisparaphenylene-(3n+ 4)-crown-n ethers and the Paraquat and Diquat dications
作者:Peter R. Ashton、Alexandra M. Z. Slawin、Neil Spencer、J. Fraser Stoddart、David J. Williams
DOI:10.1039/c39870001066
日期:——
ability of a series (n= 7–12) of bisparaphenylene-(3n+ 4)-crown-nethers to form stable 1:1 complexes with [Diquat]2+ and [Paraquat]2+ dications; these mappings of molecular recognition are supported by fast atom bombardment mass spectrometry of the 1:1 complexes with both [Diquat][PF6]2 and [Paraquat][PF6]2, and a single crystal X-ray structure analysis of [Diquat·BPP31C9][PF6]2.
[EN] AMINE-CURED TYPE EPOXY RESIN ELECTROLYTE HAVING A SULFONIC ACID GROUP AND METHOD FOR PREPARATION THEREOF<br/>[FR] ELECTROLYTE EN RESINE EPOXYDE DE TYPE DURCI PAR AMINES COMPRENANT UN GROUPE D'ACIDE SULFONIQUE ET SON PROCEDE DE PREPARATION
申请人:EBARA CORP
公开号:WO2004078822A1
公开(公告)日:2004-09-16
Provided are a sulfonic-acid-containing amine-cured type epoxy resin having at least one structure selected from structures represented by the following formulas (1)and (2) (wherein, R1 and R3 each independently represents a hydrocarbon chain having 1 to 50 carbon atoms, or a hydrocarbon chain having 1 to 50 carbon atoms and having a hydroxyl group, amino group, ether bond or imine bond, and R2 represents a hydrocarbon chain having 3 or 4 carbon atoms); electrolyte or electrolyte membrane containing the resin; method for preparation thereof; electrochemical device using the membrane. The electrolyte and electrolyte membrane according to the present invention have electrolyte properties such as ion conductivity enough for use in electrochemical devices, have heat resistance and mechanical strength, and can be prepared at a low cost. In addition, bonding or adhesion to electrodes is excellent owing to suppressed swelling of the membrane when impregnated with a solvent.
Synthesis of podands bearing aromatic end groups and complex formation with tropylium tetrafluoroborate in 1,2-dichloroethane