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Some Practical Observations on the Spectrophotometry of Dyes and Aggregation Effects
Author(s) -
Tull Alan Gilbert
Publication year - 1973
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1973.tb03139.x
Subject(s) - absorbance , electrolyte , monomer , chemistry , absorption (acoustics) , ionic bonding , spectrophotometry , dimer , ion , polymer , materials science , chromatography , organic chemistry , electrode , composite material
Absorbance curves are presented for eight dyes to illustrate the significant variations that can arise when the concentration of the dye is varied, when electrolytes are present, and when various disaggregating agents are used. A concentration range of about 10 5 : 1 was explored, although some dyes in a limited part of the range may show changes in absorption when the concentration is varied by only 2:1. At a given concentration of dye, it is sometimes possible to produce mainly the monomer by introducing a disaggregating agent or mainly the dimer by adding an electrolyte. Attention is drawn to the effectiveness and economy of non‐ionic surfactants for disaggregation. A caution is given against the facile presentation of instrumental records of spectral absorptions without specifying dye concentration and electrolyte content.