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EPR of Mn 2+ ‐Doped Tutton Salts. Role of Hydrogen Bonding
Author(s) -
Pandey R. C.,
Chaudhry A. K.,
Shukla S. R.,
Pandey S. D.
Publication year - 1992
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221710219
Subject(s) - chemistry , electron paramagnetic resonance , inorganic chemistry , ammonium , zinc , selenate , cadmium , hydrogen bond , salt (chemistry) , hydrogen , cobalt , crystallography , selenium , molecule , nuclear magnetic resonance , organic chemistry , physics
The work deals with electron paramagnetic resonance of Mn 2+ ‐doped zinc potassium selenate hexahydrate and zinc cobalt selenate hexahydrate Tutton salt single crystals. The different field parameters for the two hosts are evaluated from the observed z‐ and x‐axes spectra. The D parameters for the two hosts are compared with the corresponding reported values for hexahydrate. This parameter shows a systematic variation with the change in radii of the M′ ion in the series of salts ZnM′ 2 (SeO 4 ) 2 . 6H 2 O with M′ as K, Rb, and Cs. The case of M′ as NH 4 , however, does not show such a systematics. Similar behaviour is found for two other such series of Tutton salts, as well. Further it is found that D is, in general, negative for K, Rb, and Cs Tutton salts but is positive for NH 4 Tutton salts. This unusual behavior of NH 4 Tutton salts is attributed to two types of hydrogen bondings existing in such Tutton salts, in contrast to the only one type linking the H 2 O groups to the sulphate groups in all other Tutton salts. An attempt is also made to explain the unusual reported negative value of D in ammonium‐iron, ammonium‐cadmium, and ammonium‐nickel Tutton salts.