The chemical stability of TCNQ^‐. anion radical salts containing a low‐molecular weight and polymer cation

Abstract

The chemical stability of anion radical TCNQ‐. salts derived from low‐molecular weight and polymer 1,3‐disubstituted imidazoles and poly(trimethylammonium ethyl methacrylate) was investigated spectrophotometrically in dimethylformamide as a function of time, water content and the presence of oxygen. The low‐molecular weight TCNQ‐. salts are stable in anhydrous DMF also in the presence of oxygen. Polymer salts are decomposed already in anhydrous DMF in an ihert atmosphere. The decomposition products are the known α,α‐dicyano‐p‐toluoyl‐cyanide and the still unidentified compound with an intensive absorption at 330 nm. Along with protolytic reactions, direct oxidation with oxygen also participates in the decomposition of TCNQ‐. in aqueous DMF in the presence of oxygen.

Luminescence techniques and characterization of the morphology of polymer latices. 1. Fluorescence quenching studies upon labelled acrylic dispersions

“…(Details of the reactivity of arylmethyl methacrylates do not seem to have been published in the open literature except for benzyl methacrylate, which forms a close to ‘ideal copolymerization’ pair with methyl methacrylate 32. Reactivity ratio data are available for both 1‐33, 34 and 2‐35 naphthyl methacrylates (Reid RF and Soutar I, unpublished data), which indicate that these aryl methacrylates tend towards formation of blocky sequences in copolymerization with MMA. However, this is not particularly useful in consideration of their arylmethyl analogues and homologues since phenyl methacrylate32 shows a similarly enhanced tendency towards homopolymerization when compared to its arylmethyl homologue, benzyl methacrylate 32.…”

Toxicity of Ionic Liquids

“…Many different functional groups have already been incorporated into ionic liquid cations and anions, e. g., alkenes [7][8][9], alkynes [10,11], amines [12], amides [13], ethers [14], alcohols [15], acids [16], thiols [17][18][19], urea and thiourea [20], fluorous chains [21], glycidyl chains [22], phosphonyl [23], and ferrocenyl groups [24]. Consequently, understanding the toxicity of these functionalized ionic liquids becomes more complicated because of the potential virulence of the incorporated functionalities.…”

Electrical conductivity and stability of polymeric \documentclass{article}\pagestyle{empty}\begin{document}$\hbox{TCNQ}^{- \atop \cdot}$\end{document} salts

“…The time development of absorption spectra of the DMF solution of PMI+TCNQTCNQ;., in a n inert medium (curves I ) and in the presence of oxygen (curves 0) is shown in Figure 2 for anhydrous DMF and in Figure 3 for DMF with 50% water. Table 2 presents the positions of the maxima of characteristic absorption bands of the radical and neutral form of TCNQ" and of the assumed decomposition products [6].…”

“…Here again, oxygen accelerates the decomposition reactions (curve 0(24), Figure 3). I t should be born in mind that the investigation of the decomposition mechanism is complicated by various consecutive reactions, when reactions with the solvent should also be considered, along with other processes [6].…”