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Studies of Orcein and Its Metal Complexes I. Spectral Behaviour of Orcein. Medium Effect and Ionisation Constants
Author(s) -
Issa R.M.,
AbuElWafa S.M.
Publication year - 1984
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.198400006
Subject(s) - chemistry , solvent , orcein , absorption (acoustics) , absorption spectroscopy , metal ions in aqueous solution , ion , metal , inorganic chemistry , photochemistry , analytical chemistry (journal) , organic chemistry , optics , medicine , staining , physics , pathology
The electronic absorption spectrum of orcein is studied in organic solvent of varied polarities and water‐organic solvent mixtures with different p H. The absorption bands are assigned and the effect of solvent polarity on their position is discussed. The pk a of the acid‐base equilibria set are determined and commented upon in relation to nature and proportion of the organic solvent added. The main bands of the ir spectrum and signals of the 1 H nmr spectrum are as well discussed. The mixing of orcein with transition metal ions leads to drastic changes in colour and hence the visible absorption spectra of both organic compound and metal ions.