Spectra ambers

Figure 4.8 Infrared absorption spectrum of amber from the Baltic coast, showing the characteristic Baltic shoulder at 8.7 pm (1150 cm-1). From Beck et al. (1965 104) with permission from the University of Oxford.

Infrared absorption spectrum of amber from the Baltic coast 90... 

Unfortunately, fossil resins are largely insoluble because of their polymeric character, and a dissolved sample is a prerequisite for a well resolved NMR spectrum. We have therefore carried out comparative NMR studies on the soluble pyrolysates of amber and of pine resins. 

One type of sample to be considered is one which has a bloom or similar surface layer. This was an area first explored by Carter and co-workers [60]. They reported finding a bloom of dimorpholinyl thione and zinc stearate formed from ingredients used during the vulcanisation of the NR sample. As the mirror velocity was increased from 0.316 cm/s to 1.216 cm/s the bands associated with the bloom increased. Figure 2.12 shows the PA-FTIR spectrum of a zinc stearate bloom on an amber coloured silica-filled SBR. 

Uses Chlordane is a viscous, amber-colored liquid. Technical-grade chlordane is a mixture of many structurally related compounds including trans-chlordane, cis-chlordane, chlordane, heptachlor, and /ran.v-nonachlor.14,15 Chlordane was used as a broad-spectrum pesticide in the United States from 1948 to 1988. Its uses included termite control in homes and pest control on agricultural crops (e.g., com, citrus, home lawns, gardens, turf, ornamental plants). 

It is recovered unchanged after short exposures to air, although slow aerial oxidation does occur. It forms a 1 2 solvate, as amber prismatic crystals from CH2CI2 at — 78 °C, which slowly desolvates at ambient temperature. It is soluble in CH2CI2 and CHCI3, buy solutions darken and decompose with ligand dissociation at temperatures > — 20 °C, even under inert atmospheres. The IR spectrum (Nujol mull) shows, in addition to typical coordinated PPh3 bands, at 276(s)cm and bands associated with the coordinated... 

Figure 5.16. ACS reagent grade dextrose (glucose) solid inside USP amber vial. Conditions of Figure 5.9, average of five 10 sec integrations. Beam entered through bottom of USP vial, and vial spectrum was subtracted.

Figure 10.13. Spectra of 4-acetamidophenol as an open powder and inside an amber vial. Both spectra are corrected for response function with Kopp 2412 glass. For the vial speetrum, the standard was inside the vial when the response function was determined. Bottom spectrum is the difference of the corrected spectra. Optical geometry was that of Figure 10.12 laser wavelength was 785 nra.

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