Synthesis of multivalent host and guest molecules for the construction of multithreaded diamide pseudorotaxanes
作者:Nora L Löw、Egor V Dzyuba、Boris Brusilowskij、Lena Kaufmann、Elisa Franzmann、Wolfgang Maison、Emily Brandt、Daniel Aicher、Arno Wiehe、Christoph A Schalley
DOI:10.3762/bjoc.8.24
日期:——
tetravalent axles and wheels for the synthesis of pseudorotaxanes bearing the tetralactam macrocycle/diamide axle binding motif was prepared. Starting from iodinated monovalent precursors, Sonogashira cross-coupling reactions were utilized to couple the binding sites to appropriate spacer groups. Through this "Lego" or "toolbox" approach, the convergent synthesis of host and guests with a well-defined
Coupled Molecular Switching Processes in Ordered Mono- and Multilayers of Stimulus-Responsive Rotaxanes on Gold Surfaces
作者:Thomas Heinrich、Christoph H.-H. Traulsen、Markus Holzweber、Sebastian Richter、Valentin Kunz、Sarah K. Kastner、Sven O. Krabbenborg、Jurriaan Huskens、Wolfgang E. S. Unger、Christoph A. Schalley
DOI:10.1021/ja512654d
日期:2015.4.8
Interfaces provide the structural basis for function as, for example, encountered in nature in the membrane-embedded photosystem or in technology in solar cells. Synthetic functional multilayers of molecules cooperating in a coupled manner can be fabricated on surfaces through layer-by-layer self-assembly. Ordered arrays of stimulus-responsive rotaxanes undergoing well-controlled axle shuttling are excellent candidates for coupled mechanical motion. Such stimulus-responsive surfaces may help integrate synthetic molecular machines in larger systems exhibiting even macroscopic effects or generating mechanical work from chemical energy through cooperative action. The present work demonstrates the successful deposition of ordered mono- and multilayers of chemically switchable rotaxanes on gold surfaces. Rotaxane mono- and multilayers are shown to reversibly switch in a coupled manner between two ordered states as revealed by linear dichroism effects in angle-resolved NEXAFS spectra. Such a concerted switching process is observed only when the surfaces are well packed, while less densely packed surfaces lacking lateral order do not exhibit such effects.