Photo-induced and electronic properties of soluble rigid-rod polyimides was written by Tomikawa, Masao. And the article was included in Recent Research Developments in Polymer Science in 1998.Safety of 1,4-Diiodo-2,3,5,6-tetramethylbenzene This article mentions the following:
A series of fluoroalkyl-substituted pyromellitic dianhydrides were synthesized from 1,2,4,5-tetramethyl-benzene (durene). Soluble rigid-rod polyimides were obtained from the dianhydrides and 4,4′-Diamino-2,2′-bis(trifluoromethyl)biphenyl (PFMB) in phenolic solvents in the presence of isoquinoline catalyst. The polyimides are soluble in N-methyl-2-pyrrolidone (NMP), N,N-dimethylacetamide (DMAc), m-cresol, and other polar solvents, in spite of their rigid-rod structure. UV irradiation induced color changes of the polyimide solutions A new absorption band appeared in the 700 nm region and an ESR signal emerged upon UV-irradiation which are attributed to the anion radical of the diimide moiety in the polyimide, as deduced from the hyperfine structure of the ESR signal. The same radical was detected by electrochem. confirming that the radical was generated by photoinduced charge transfer reaction. The UV-irradiation also causes a decrease in the solution viscosity and this change is reversible. In the experiment, the researchers used many compounds, for example, 1,4-Diiodo-2,3,5,6-tetramethylbenzene (cas: 3268-21-1Safety of 1,4-Diiodo-2,3,5,6-tetramethylbenzene).
1,4-Diiodo-2,3,5,6-tetramethylbenzene (cas: 3268-21-1) belongs to iodide derivatives. Organic iodides can be alkyl, alkenyl, or alkynyl, and all of them are very reactive toward with many kinds of nucleophiles. In the chemical industry, alkyl iodides serve as excellent alkylating agents and, specifically, methyl iodide is used as a methylating agent in the synthesis of various pharmaceutical drugs.Safety of 1,4-Diiodo-2,3,5,6-tetramethylbenzene
Referemce:
Iodide – Wikipedia,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com