UWVis

Calculated from UWVIS spectrophotometric data, unless otherwise indicated. 

HPLC grade nonpolar solvents, toluene and dichloromethane, were purchased from Aldrich. Toluene was distilled over sodium/benzophenone, and dichloromethane was distilled over calcium hydride. All solvents were stored under nitrogen, over molecular sieves. Water content in dried solvents was typically less than 1 mM. Potassium salts of transition-metal-substituted heteropoly complexes were prepared according to the methods published previously. The IR, UWVIS spectra, and Cyclic Voltammograms agreed... 

Cinnamic alcohol and its derivatives are starting materials for the synthesis of coumarin dyes used in food industries and as laser dyes. By irradiation at 254 nm cinnamic acid or the alcohol exhibits an extremely complex reaction spectrum using UWVis-spectroscopy. A comparison of the reaction chromatograms for different irradiation conditions in various solvents... 

Until the early 1980s, most mid-IR spectrometer systems were double-beam dispersive grating spectrometers, similar in operation to the double-beam system for ultraviolet/visible (UV/VIS) spectroscopy described in Chapter 2. These instruments have been replaced almost entirely by FTIR spectrometers because of the advantages in speed, signal-to-noise ratio, and precision in determining spectral frequency that can be obtained from a modem multiplex instrument. There are NIR instruments that are part of double-beam dispersive UWVIS/NIR systems, but many NIR instruments are stand-alone grating instruments. 

Physical Data decomposes at 138 2°C in an exothermic reaction without melting UWVis (EtOH) A.max (log e) = 309 (4.16), 240 nm (4.20) H, C NMR data FT-IR, single crystal X-ray crystallography and electronic spectrum have been investigated. ... 

The UWVis spectrophotometer shows that the absorption spectrum was at about 532 nm. The wavelength was overlapped with the absorption region of laser with better thermal efficiency. 

The polymerisation of various monomers within mordenite and ZSM-5 channels has been investigated by a variety of spectroscopic techniques, including resonance Raman, Photoacoustic Infrared (PAIRS) and X-ray photoelectron spectroscopy (XPS)(7d-79). This paper summarises previous data and reports recent results from ESR and UWVIS studies. Collation of this research allows the factors affecting the polymerisation reaction within zeolite channels to be identified. 

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