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Articles on Rotaxanes
Explanation for the electrophoresis behaviour of DNA condensation induced by pseudopolyrotaxane of different lengths.
We synthesized a series of pseudopolyrotaxanes (PPRs) by threading 6-[(6-aminohexyl)amino]-6-deoxy-beta-CD dichloride on the polypropylene glycol and investigated their DNA condensation efficiency by electrophoresis assay. The PPRs of the middle length exhibited the best DNA condensation efficiency...
Supramolecular control of polyplex dissociation and cell transfection: Efficacy of amino groups and threading cyclodextrins in biocleavable ...
We prepared biocleavable polyrotaxanes with different numbers of threading alpha-CD and amino (DMAE) groups to enhance the transfection activity of DMAE-SS-PRXs. 29DMAE-alpha18-SS-PRX, in which the numbers of alpha-CD molecules and amino groups were 18 and 29 respectively, exhibited a high transfect...
Computational models for the shuttling motion of the macrocycle in rotaxane-based molecular switches.
We have investigated a prototypical shaft including two octahedral ruthenium complexes linked by a conjugated C(14) carbon chain, where the shuttling motion can be triggered by changing the electronic environment of the active complexes with ligand exchange reactions. The computational results also...
Electrical and mechanical switching in a realistic rotaxane device model.
Rotaxane-type resorcinarene tetramers as histone-sensing fluorescent receptors.
Rotaxane-type receptors, which were composed of anionic cyclophane-based resorcinarene tetramers as the wheel and a 2,6-disubstituted naphthalene derivative having two fluorophore moieties, such as fluorescein and rhodamine residues, as the axle ( and , respectively), were prepared. Rotaxane-type re...
An AFM/rotaxane molecular reading head for sequence-dependent DNA structures.
DNA secondary structure may prove to be a significant obstacle both for enzymes that process DNA through an orifice and for the passage of DNA through nanopores proposed for some novel sequencing schemes. A nanomechanical molecular "tape reader" is assembled by threading a nanopore over DNA and pull...
A new pH-switchable dimannosyl[c2]daisy chain molecular machine.
Single- and double-stranded helical polymers: synthesis, structures, and functions.
We describe the recent advances in the synthesis, structures, and functions of single- and double-stranded helical polymers from our group and others and provide a brief historical overview of synthetic helical polymers. We found unique macromolecules that fold into a preferred-handed helix through...
Cyclic pseudorotaxane tetramers consisting of two rigid rods threaded through two bis-macrocycles: copper(I)-templated synthesis and X-ra...
Variously substituted coordinating rigid rods have been synthesized which incorporate a central 4,7-phenanthroline nucleus attached to two 2-pyridyl groups via its 3 and 8 positions, so as to yield bis-bidentate chelates, the two-coordinating axes of the chelates being parallel to one another. Regar...
Synthesis and photophysical investigation of squaraine rotaxanes by "clicked capping".