Two metal–organic frameworks based on a double azolium derivative: post-modification and catalytic activity
Materials and Measurements. All of the chemicals were obtained from commercial sources and were used without further purification. 1-(4-methylcarboxyphenyl)-imidazole was prepared according to the literature method. 1 Element analyses were performed on a ThermoFinnigan Flash EA 1112 elementary analyzer. IR spectra (KBr pellets) were taken on an AVATAR-370 Nicolet spectrometer in the 4000-400 cm -1 region. Inductively coupled plasma mass spectrometries (ICP-MS) were performed on an XSeries II
... on an XSeries II instrument. Transmission electron microscopy (TEM) experiments were conduced using a JEOL JEM-1230 microscope operated at 80 kV. X-ray photoelectron spectroscopy (XPS) measurements were recorded on a VG ESCALAB MARK II system, and the C 1s line at 284.9 eV was used as the binding energy reference. Thermogravimetric analyses (TGA) were carried out on a SDT Q600 compositional analysis instrument from 30 to 800 °C under N 2 atmosphere at a heating rate of 10 °C/min. Powder X-ray diffraction data (PXRD) were recorded on a RIGAKU D/MAX 2550/PC for Cu-Kα (λ = 1.5406 Å). Luminescent spectra for the solid samples were recorded with a Hitachi F4500 fluorescence spectrometer. 1 H NMR spectra were recorded on a 500 MHz spectrometer in CDCl 3 or D 2 O solution and the chemical shifts were reported relative to internal standard TMS (0 ppm). X-ray crystal data collections and structure determinations.