Amines spectroscopic analysis

Oligomeric hindered amine light stabilisers, such as Tinuvin 622 and Chimassorb 944, resist satisfactory analysis by conventional HPLC and have required direct UV spectroscopic analysis of a polyolefin extract [596], PyGC of an extract [618,648], or SEC of an extract [649]. Freitag et al. [616] determined Tinuvin 622 in LDPE, HDPE and PP by saponification of the polymer dissolution in hot toluene via addition of an... 

Experimental information on the complexes between dihalogens and methylated amines is still comparatively scarce. Gas-phase investigations are available only for the complexes of trimethylamine with F2 [41 ] and with C1F [42], So far only a few theoretical investigations on XY- amine complexes have been presented [16,17,22,24,28,32,34,43,44]. On the basis of rotational spectroscopic analysis, the N(CH3)3 C1F complex was described as being dominated by a significant contribution of an ionic [(CH3)NC1]+- -F valence bond structure [41]. For the (CH3)3N F2 complex an even stronger tendency toward an ionic [(CH3)NF]+- F structure was reported [40]. 

Another strategy to improve transport efficiency of the Ba(thd)2 and process reproducibility is to use NH, which is a simple amine adduct, as a carrier gas for the precursor. This idea was suggested by A. Baron in 1990 for the MOCVD of high T, superconducting oxide films containing Ba ions. J. S. Lee et al. recently reported in - situ mass spectroscopic analysis results of the MOCVD of SrTi03 thin... 

TLC only offers a qualitative result. HPLC and HPLC/mass spectroscopic analysis give both qualitative and quantitative results. Eor HPLC analysis, the test results should be calibrated with the standard aromatic amines at known concentrations. 

The reaction mechanism of liquid dimer polyamides and fatty amido amines with epoxy resins has been studied by Peerman et al. (27). who employed infrared spectroscopic analysis to determine reaction rates. They showed that the terminal epoxy content of a blend of amino-containing polyamide and epoxy resin disappeared more rapidly at 150 °C than does the epoxy content of blends of epoxy resin with triethylenetetramine or tris[(dimethylamino)-raethy1Jphenol. Both of these compounds are well-known for their fast cure at ambient temperatures. Correspondingly, the liquid polyamide or fatty amido amines-epoxy combinations cure slower than the other two systems at ambient conditions. 

Anionic thesis of macromonomer of 1,1-diphenylethylene-type unit canying amino group has been performed in a variety of solvents. The product was characterized a combination of H NMR spectroscopic and size exclusion chromatographic analysis. Based on the UV/Visible spectroscopic analysis, the crossover reaction of /i-butyllithium (n-BuLi) with l-[4-bis(trimethylsilyl>amino]phenyl]-l-phenylethylene was found to be so slow in benzene, but it was completed in the benzene/THF mixture within 2 h. The i thesis of macromonomer of thel,l-diphenylethylene-type unit (over 95 %) canying amine-functional group (maximum 94 %) was successful on the basis of H NMR spectroscopic analysis. 

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