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Spectrophotometric Studies of Dioxo‐Complexes of Quadrivalent Metals. I. Complexes of Zirconium and Hafnium with Pyrogallolsulfonephthalein
Author(s) -
Pan Kuan,
Lin ZuiFeng,
Lin ShengHsien,
Wu YuLin,
Chen EngMing
Publication year - 1963
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.196300003
Subject(s) - hafnium , chemistry , zirconium , inorganic chemistry , absorption (acoustics) , nuclear chemistry , physics , acoustics
Pyrogallolsulfonephthalein and its complexes with zirconium and hafnium were spectrophotometrically studied in HClO 4 and NaClO 4 solutions of various p H's. An absorption maximum at 472 mμ has been found for pyrogallolsulfonephthalein at p H 1.0 and 1.5. It shifts to 518 and 520mμ in the presence of zirconium at p H 1.0 and hafnium at p H 1.5, respectively. The mole ratios of both metals to the dye have been found to be 1:1, and the apparent instability constants of the complexes are estimated as 1.34×10 −5 for the former and 7.06×10 −6 for the latter.