Anion mediated polytype selectivity among the basic salts of Co(II) |
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Authors: | T.N. Ramesh P. Vishnu Kamath |
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Affiliation: | a Department of Chemistry, Central College, Bangalore University, Bangalore 560 001, India b Department of Chemistry, St. Joseph's College, Lalbagh Road, Bangalore 560 027, India |
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Abstract: | Basic salts of Co(II) crystallize in the rhombohedral structure. Two different polytypes, 3R1 and 3R2, with distinct stacking sequences of the metal hydroxide slabs, are possible within the rhombohedral structure. These polytypes are generated by simple translation of successive layers by (2/3, 1/3, z) or (1/3, 2/3, z). The symmetry of the anion and the mode of coordination influences polytype selection. Cobalt hydroxynitrate crystallizes in the structure of the 3R2 polytype while the hydroxytartarate, hydroxychloride and α-cobalt hydroxide crystallize in the structure of the 3R1 polytype. Cobalt hydroxysulfate is turbostratically disordered. The turbostratic disorder is a direct consequence of the mismatch between the crystallographically defined interlayer sites generated within the crystal and the tetrahedral symmetry of the SO42− ions. |
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Keywords: | Cobalt hydroxysalts DIFFaX simulations Polytypes Urea hydrolysis |
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