By A. Whitaker (auth.), A. T. Peters, H. S. Freeman (eds.)

More than one and a part many years have handed because the final publication was once released describing advancements within the analytical chemistry of artificial colorants. within the intervening interval, the scope and technical services of instrumentation for analysing dyes and pigments has considerably multiplied. it's now attainable to swiftly unravel a few difficulties whose suggestions have been formerly both inconceivable or very tricky to accomplish. for example, the unambiguous project of the entire signs within the proton NMR spectrum of a trisazo direct dye, and the affirmation of the molecular weight of involatile, and, specifically, sulphonated dyes, with no derivatisation, are actually regimen analytical recommendations in lots of laboratories this day. furthermore, it truly is now attainable to checklist the NMR spectrum of a dye molecule on below 1 mg of fabric, and we're not constrained to resolution spectra, because sturdy samples can now be regularly analysed in NMR experiments. when no longer trying to be all encompassing, this quantity is meant to bridge the space among what was once coated within the previous paintings edited by way of Professor Venkataraman and the advancements that have considering that ensued in a few key components. It offers vital updates in X-ray crystallography, proton NMR, IR spectroscopy and mass spectrometry, and also covers subject matters equivalent to ESR, micro spectrophotometry and emission spectroscopy.

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In the earier review', it was noted that there was evidence for three polymorphs in phthalocyanine: a, p 233 and X forms 234 . A fourth form has been claimed233 , but Honigmann 235 had already shown that this was a poorly crystalline a form. Since then, in addition to confirming patterns of these polymorphs becoming available, the existence of several more polymorphs have been claimed. In order of discovery, these have been named &, 71, r, modified 71 X-RA Y POWDER DIFFRACTION 33 and r. One of the problems with the methods of confirming these various polymorphs is the lack of certainty regarding whether a single polymorph rather than a mixture is under examination.

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