The crystal structure of octane‐1,8‐dicarboxylic acid (sebacic acid), C10H18O4, has been redetermined at 180 K. The molecular units are centrosymmetric and linked via the ubiquitous syn–syn carboxylic acid dimer to form infinite chains running along the [01] vector.
A search method for investigating the extent to which chloro-methyl interchange is exhibited by crystal Structures deposited with the Cambridge Crystallographic Database is presented. Using the October 1998 release with 190,307 data entries, 105 pairs were identified for which there was a common molecular framework, differing only in the presence of a chloro or methyl group. Approximately 30% appear to demonstrate isotructural packing arrangements. Two examples within the database that were found not to show CI-Me interchange were subsequcntly examined from the viewpoint of structural mimicry and the formation of mixed crystals.
Inkjet-printed electronics are showing promising potential in practical applications, but methods for real-time, non-contact monitoring of printing quality are lacking. This work explores Terahertz (THz) sensing as an approach for such monitoring. It is demonstrated that alterations in the localised dielectric characteristics of inkjet-printed electronics can be qualitatively distinguished using quasi-optically-based, sub-THz reflection spectroscopy. Decreased reflection coefficients caused by the sintering process are observed and quantified. Using THz near-field scanning imaging, it is shown that sintering produces a more uniform spatial distribution of permittivity in the printed carbon patterns. Images generated using THz-TDS based imaging are presented, demonstrating the combination of high resolution imaging with quantification of complex permittivities. This work, for the first time, demonstrates the feasibility of quality control in printed electronic-ink with THz sensing, and is of practical significance to the development of in-situ and non-contact commercial-quality characterisation methods for inkjet-printed electronics.
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