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The Effect of Perchloric Acid on the Mössbauer Parameters of tin‐119 in Frozen Solutions
Author(s) -
Cheng H. S.,
Hsu C. M.,
Chen M. Y.,
Luh H.
Publication year - 1987
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.198700027
Subject(s) - perchloric acid , chemistry , perchlorate , mössbauer spectroscopy , tin , ligand (biochemistry) , inorganic chemistry , ion , crystallography , organic chemistry , biochemistry , receptor
The Mössbauer parameters of frozen solutions of 0.05 M Sn(H 2 O)(ClO 4 ) 2 , Sn(H 2 O) 3 (ClO 4 ) 4 , SnCl 4 ·5H 2 O, SnBr 4 and Na 2 SnBr 6 [designated as Sn(H 2 O) N‐N , L ( x‐N ')+ N , in which N ≤ N ; N ' = N = 6 for SnBr 2− 6 , N ′=4 with N =6 for Sn(H 2 O) 2 (ClO 4 4 Sn(H 2 O) 2 Cl 4 and Sn(H 2 O) 2 Br 4 and N ′=2 with N =3 for Sn(H 2 O)(ClO 4 4 ) 2 ] were found to be linearly related to the concentration ( c ) of perchloric acid. These facts were attributed to a change in activity of water ( a w ). At c =O, a w =1, the Mössbauer parameters corresponded to Sn(H 2 O) z + N , whereas at c =11.6 M (70%), they corresponded to the crystalline state of Sn(H 2 O) N‐N , L ( z‐N )+ N +. It was shown that even ClO − 4 ion could coordinate to tin atom in perchloric acid. The degree of association at any given c could be estimated very easily through the relation . It was emphasized that the activity of water should be taken into account when equilibrium studies were carried out in perchloric acid solutions. Further corrections for perchlorate complex formation should be made, if a very weak ligand was added into metal perchlorate solutions.