Molecular switch {is one of the|is among the|is amongst the} {essential|important|crucial|vital|necessary|critical} functional units of molecular electronics. {Here|Right here}, we report {development|improvement} of new molecular switches {based on|according to|depending on|determined by} the electron-rich diruthenium complexes {with the|using the|with all the|together with the} ({2|two},5-di-R-substituted 1,4-diethynylbenzene)diyl linkers. The dinuclear molecular switches, {µ-p-C≡C-(2,5-R2-C6H2)-C≡C}{Ru(dppe)2(C≡C-C6H4-p-SMe)}{2|two} 1R (R= OMe, H, CF3), with {various|numerous|different|a variety of|several|many} substituents (R) {on the|around the} bridging phenylene rings showed two successive reversible 1e-oxidation waves, indicating stability of 1e-oxidized mixed-valence species. The solid-state structure of [1H]+ showed the charge-localized Robin-Day class II nature, {while|whilst|although|even though|when|though} that of [1OMe]+ revealed the {fully|totally|completely} charge-delocalized class III nature. These characters {were|had been|have been} also evident {from the|in the} spectroscopic {data|information} in {solutions|options}. Single-molecule conductance measurements by the scanning tunneling microscope break junction {method|technique|approach|strategy|system|process} revealed a {significant|substantial|considerable|important} dependence {of the|from the|in the|on the|with the|of your} conductance on R, i.e. 1OMe turned out {to be|to become} >100-times {more|much more|a lot more|far more|additional|extra} conductive than 1H and 1CF3, whereas the substituent {effect|impact} {of the|from the|in the|on the|with the|of your} monocationic complexes was {within|inside} a fold-change of {2|two}. {As a result|Consequently|Because of this}, the ON/OFF ratios (the ratios {of the|from the|in the|on the|with the|of your} conductance {of the|from the|in the|on the|with the|of your} cationic species [1R]+ to that {of the|from the|in the|on the|with the|of your} neutral species 1R) {were|had been|have been} critically dependent on R (as {large|big|huge|massive|substantial|significant} as 191 when R = CF3) {and even|as well as|and also|and in some cases} reversed (0.{4|four} when R = OMe). {Furthermore|Moreover|In addition|Additionally}, the neutral and monocationic complexes 1H and [1H]+ fabricated {into the|in to the} nanogap devices showed in situ ON/OFF switching behavior. The present study demonstrates {not only|not just|not merely|not simply} the {rare|uncommon} examples {of the|from the|in the|on the|with the|of your} mixed-valence complexes which {were|had been|have been} subjected {to the|towards the|for the} break junction measurements {but also|but additionally|but in addition} {the first|the very first|the initial} examples of molecular switch, the ON/OFF ratio of which was controlled by tuning the organic linker {parts|components}. Azido-PEG2-C2-acid supplier Methyl 5-formylpicolinate site PMID:23880095
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