19 results about "Viologen" patented technology

Viologens are organic compounds with the formula (C₅H₄NR)₂ⁿ⁺. In some viologens, the pyridyl groups are further modified. The viologen paraquat (R = methyl), is a widely used herbicide. Other viologens have been commercialized because they can change color reversibly many times through reduction and oxidation. The name viologen alludes to violet, one color it can exhibit, and the radical cation (C₅H₄NR)₂⁺ is colored intensely blue.