Maxis uhr tof ms spectrometer

All the chemical reagents were analytically pure, obtained from commercial sources, and used directly without further purification. Tetrabutylammonium salts (purchased from Aladdin, Shanghai, China) were used for the anion studies. ¹H NMR and ¹³C NMR spectra were obtained on a Bruker Advance 400 spectrometer in CDCl₃ at room temperature. FT-IR spectra were obtained using a Bruker Tensor-27 spectrophotometer. Mass spectra were recorded on a Bruker Maxis UHR-TOF MS spectrometer. Electrochemistry was measured using a CH 1604C electrochemical analyzer, employing glassy carbon (diameter: 1.6 mm; area 0.02 cm²), a platinum wire, and Ag/AgNO₃ (Ag/Ag⁺) as the working electrode, counter electrode, and reference electrode, respectively. Tetrabutylammonium hexafluorophosphate (TBAPF₆) (0.1 M) in dichloromethane was used as the electrolyte. UV-vis absorption spectra were obtained with an Agilent Cary 5000 spectrophotometer. Fluorescence spectra measurements were obtained on a Hitachi F-7100 spectrofluorometer. The solutions of the probes were typically 1 × 10⁻⁵ M for the UV-vis and emission studies. Fluorescence microscopic images were obtained using an Olympus (Japan) BH2 fluorescence microscope with an excitation range of 450–490 nm.