For exchanged Na-A° synthetic zeolites with cobalt contents of 1–5 atoms per unit cell the dehydration sequence is shown to be Co2+(H2O)6 [graphic omitted] Co2+(H2O)4(tetrahedral) [graphic omitted] Co2+(Ox)3·(H2O)2(trigonal bipyramid) [graphic omitted] Co2+(Ox)3(trigonal)(Ox refers to oxygen atoms in the 6-rings of the zeolite).
S. Akbar and R. W. Joyner, J. Chem. Soc., Chem. Commun., 1978, 548 DOI: 10.1039/C39780000548
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