Reagents were generated locally on an array of eight individually addressable electrodes in order to modify self‐assembled monolayers. Since the array was manufactured in a soft polymer material, it can have mechanical contact with a delicate sample without inducing defects. Lengthy leveling procedures are not necessary and the scan times can be shortened.
a b s t r a c tSoft linear gold microelectrode arrays for high throughput scanning electrochemical microscopy (SECM) imaging were fabricated using the Aerosol Jet Ò printing technology. Nanoparticulate gold ink was printed on polyimide Kapton HN Ò thin films. After sintering, a 200 nm thick Parylene C coating was deposited to cover and seal the gold tracks. A cross-section of the array of microelectrodes was exposed by laser cutting using an ArF excimer laser beam directed onto a metallic mask. Cyclic voltammograms, approach curves and SECM images in feedback mode demonstrate the capability of the arrays as SECM probes. Reactivity imaging of a platinum band structure on glass was performed with Parylene C coating facing the substrate providing an almost constant working distance. The softness of the array leads to a bending and allows scanning in contact mode like brushing the sample surface. For hard surfaces such as array electrode structures and similar materials, this occurs without detectable damage to the sample.
In solution, the digermene Ar 2 GedGeAr 2 (Ar ) 2-tBu-4,5,6-Me 3 C 6 H) partly dissociates into two molecules of the germylene Ar 2 Ge:. The reaction of this digermene with some 1,3-diynes (RCtC-) 2 leads to the formation of the acetylene-linked bis(germaethenesThe conjugation between the two GedC units is reflected by the positions of the UV/vis absorptions at longest wavelengths of 518 (6a) and 595 (6b) nm. An X-ray structure analysis of 6a reveals a nearly linear C 4 skeleton and short GedC bond lengths of 1.819(2) Å.
Di-tert-butyl-1,2-benzoquinone reacts with the acetylene-linked bis(germaethene) Ar 2 GedC(R)-CtC-C(R)dGeAr 2 , R ) C 6 H 5 , Ar ) 2-tBu-4,5,6-Me 3 C 6 H (4), in a [4+2] fashion to furnish the sterically crowded product 5 of 2-fold cycloaddition to the GedC bonds. The reaction of 4 with 1,2-dicyanoethylene proceeds differently, namely, by [2+4] cycloaddition of one of the CtN bonds to the GedC and CtC bonds, followed by a [2+2] cycloaddition of the remaining GedC bond to the newly formed CdC bond to give the bicyclic compound 6. An unprecedented C-H activation of a tert-butyl and an aryl C-H bond leads finally to the hexacyclic compound 8 via the tetracyclic product 7. Cyanogen gas reacts similarly by [2+4] and [2+2] cycloadditions to furnish the bicyclic compound 9. In this case, no C-H addition to the endocyclic CdN bond is observed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.