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.
Synthesis and Electrochemical Properties of [2]Rotaxanes with <i>meta</i>-Terphenyl and <i>meta</i>-Terphenyl-Capped Dendritic Stoppers
作者:Perumal Rajakumar、Kannupal Srinivasan
DOI:10.1055/s-2005-872104
日期:——
A meta-terphenyl moiety has been employed as a stopper in a Stoddart-type [2]rotaxane, which is formed in a remarkably high yield due to the additional templating effect of the stoppers. Making use of the recognition between bis(pyridinium)ethane and dibenzo-24-crown-8 ether, the [2]rotaxanes with m-terphenyl and m-terphenyl-capped dendritic stoppers have been synthesized by a threading procedure. The [2]rotaxane 7 displays two bielectronic redox waves while the [2]rotaxanes 10 and 11 show four distinct monoelectronic redox waves.