Open AccessStudies of co-ordination.—Part II. absorption spectra of metallic derivatives of benzoylcamphor
Author(s) -
Thomas Martin Lowry,
Henry Burgess,
Ivor John Faulkner,
Ralph C. Traill
Publication year - 1931
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1931.0107
Subject(s) - chemistry , metal , absorption (acoustics) , absorption spectroscopy , enol , molecule , absorption band , aqueous solution , solvent , copper , salt (chemistry) , metal ions in aqueous solution , ion , inorganic chemistry , crystallography , organic chemistry , materials science , catalysis , physics , quantum mechanics , optics , composite material
In the preceding paper of the present series on “Absorption Spectra and Co-ordination of some Cupric Compounds” observations were recorded of the absorption spectra, in the infra-red, visible and ultra-violet regions, of a series of metallic derivatives of copper, ranging from typical metallic salts, such as the blue aqueous sulphate and nitrate, through the blue-green acetate and its homologues, to the violet, yellow or brown derivatives of various β-diketones. In spite of the wide differences of colour in these compounds, the variations were found to be due to a mere displacement of a single absorption band,e. g ., from 9600 Å. U. in K2 CuCl4 to 6000 Å. U. in [Cu. 4NH3 SO4 , and the conclusion was drawn that the cupric ion inall these compounds exhibits a fourfold co-ordination, either with the anions of the salt or with molecules of the solvent. In the present paper analogous methods have been applied to the study of the metallic derivatives of benzoylcamphor. The investigation had its origin in a suggested correlation between the phenomena ofdynamic isomerism in prototropic compounds and ofco-ordination in their metallic derivatives. The former phenomenon was attributed, on the basis of an extended definition of acids and bases,† to the possibility of separating a proton from two alternative positions in the molecule, giving rise to two isomeric anions, which could be converted into one another through an intermediate multipolar ion,e. g ., HO.C=C─⇌- O─C─C-⇌- O─+ | | | | Enol. Enolic anion. C─- C─⇌O=C─- C─⇌O=C─C─ | | | | | | Multipolar ion. Ketonic anion. Ketone.H