Triphenylamine-based pH chemosensor: Synthesis, crystal structure, photophysical properties and computational studies was written by Gu, Dan;Yang, Guochun;He, Yi;Qi, Bin;Wang, Guang;Su, Zhongmin. And the article was included in Synthetic Metals in 2009.Category: piperazines This article mentions the following:
A triphenylamine-containing pH chemosensor, N,N’-di[3-(diphenylamine)benzyl]-piperazine, was designed and synthesized with Ullmann reaction. The compound crystallize in the monoclinic space group P21/n: a = 9.8004(12) Å, b = 13.3321(17) Å, c = 12.9575(16) Å, β = 103.510(2)°, Z = 2 and ρ = 1.212 Mg/m3. The synthesized compound excited by UV light produce intensive emission and a quantum yield of 0.56 relative to quinine sulfate was achieved. The fluorescence intensity of synthesized compound in water/DMF (4:1, volume/volume) under excitation of 307 nm decreased with the decrease of pH, exptl. and computational studies further confirmed that the protonation of N-triphenylamine leads to the fluorescence quenching. The results clearly indicate the potential of synthesized compound as highly efficient on-off switcher for protons. In the experiment, the researchers used many compounds, for example, Piperazine Dihydrochloride (cas: 142-64-3Category: piperazines).
Piperazine Dihydrochloride (cas: 142-64-3) belongs to piperazine derivatives. Piperazine causes primary dermal irritation and skin burns at high concentrations. Piperazine also causes eye irritation in humans. Piperazine is formed as a co-product in the ammoniation of 1,2-dichloroethane or ethanolamine. These are the only routes to the chemical used commercially.Category: piperazines
Referemce:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics