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Metallindikatoren VI. Ein auf Metallkationen ansprechendes Nitrophenol
Author(s) -
Schwarzenbach G.,
Anderegg G.,
Sallmann R.
Publication year - 1952
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19520350603
Subject(s) - chemistry , metal , absorption (acoustics) , oxygen atom , absorption spectroscopy , proton , oxygen , inorganic chemistry , nitrophenol , hydrogen atom , derivative (finance) , photochemistry , medicinal chemistry , group (periodic table) , molecule , organic chemistry , catalysis , physics , quantum mechanics , acoustics , financial economics , economics
A derivative of p‐nitrophenol carrying in o‐position to the phenolic OH the groupment: CH 2 N(CH 2 COOH) 2 changes its light absorption when metal cations are added. The stability constants of the complexes formed hereby have been determined and their absorption spectra have been measured. Increasing shift of the absorption band has been observed in the series: Ba +2 , H + , Mg +2 , Zn +2 , which is due to increasing “electron sharing ability” of the cations. The proton of this series is held primarily by the iminodiacetat group and forms a hydrogen bridge between the nitrogen atom and the oxygen of the phenolic OH. A proton held primarily by the phenolate oxygen has a stronger influence than Zn +2 and other heavy metal cations.