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Articles you may be interested inCommunication: Scanning tunneling microscopy study of the reaction of octanethiolate self-assembled monolayers with atomic chlorine Insertion process and electrical conduction of conjugated molecules in n-alkanethiol self-assembled monolayers on Au(111) A low-current scanning tunneling microscope ͑STM͒ was used to image ordered alkanethiol self-assembled monolayers ͑SAMs͒ on Au ͑111͒ surface. The effects of the tunneling current on the STM images of both decanethiol and dodecanethiol SAMs were studied. At low current, with the tip above the sample surface, domain boundaries and ordered alkanethiol molecules can be seen clearly. When the tunneling current was increased, destructive STM images of decanethiol and dodecanethiol SAMs were observed. However, when the tunneling current was reduced back to the original low values, the ordered structures of alkanethiol molecules reappeared. This reversible process suggests that there is no rearrangement in the sulfur head groups under different tunneling current conditions. In this article, we present a model which supports the important role of the alkyl chain in the STM imaging of SAMs. In our model, the medium conductance is a key factor.

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In this work, we reported a porous supramolecular framework (A) constructed of a symmetric tetramethylcucurbit[6]uril (TMeQ[6]) in aqueous HCl solutions; the driving force was the outer surface interaction of cucurbit[n]urils, as well as hydrogen bonding between latticed water molecules and portal carbonyl oxygens of TMeQ[6]. Adsorption experimental results revealed that the porous supramolecular framework can absorb certain fluorophore guests (FGs) to form luminescent assemblies (FG@As) by fluorescence enhancement or colour change, and some of them can respond to certain volatile organic compounds. Thus, the TMeQ[6]-based supramolecular framework could be used as a sensor for certain gas or volatile compounds.