《Iodide-Selective PVC Membrane Electrode Based on Copper Complex of 2-Acetylthiophene Semicarbazone as Carrier》 was written by Suman, Shankar; Singh, Ram. Formula: C6H6OS And the article was included in Analytical Chemistry Letters in 2020. The article conveys some information:
A highly selective poly(vinyl chloride) (PVC) membrane electrode based on copper (II) complex of 2 acetylthiophene semicarbazone as a new carrier for iodide selective electrode is fabricated with the composition of PVC (30%), plasticizer (64%), ionophore (4%) and lipophilic additive (2%). The prepared electrode has been found to exhibit the best sensitivity over a wide concentration range of 1×10-6 to 3.2×10-2 M with a near Nernstian response of 57.2 mV per decade over a wide pH range of 2.5 10.5. The detection limit for the electrode was found to be 5.50×10-7 M with the response time of 15 s and can be used for at least 3 mo without any considerable divergence in its potential response. In addition to this study using 1-Thiophen-2-yl-ethanone, there are many other studies that have used 1-Thiophen-2-yl-ethanone(cas: 88-15-3Formula: C6H6OS) was used in this study.
1-Thiophen-2-yl-ethanone(cas: 88-15-3) belongs to thiophenes. Specialized thiophenes can be synthesized similarly using Lawesson’s reagent as the sulfidizing agent, or via the Gewald reaction, which involves the condensation of two esters in the presence of elemental sulfur. Another method is the Volhard–Erdmann cyclization. Formula: C6H6OS
Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem