I think it has nothing to do with oxidation state at all. All Co(II) salts will change color from pink to green or bluish green when dehydrated. This is due to a change in coordination geometry from octahedral to tetrahedral state. Co(II) in octahedral geometry will be pink. PEG will dehydrate and this leads to green color. Still you have Co(II) hydroxide only but in tetrahedral coordination geometry.
Thanks for considering my doubts and clarifying sir.
using hydrothermal process i tried the same procedure, it gives lavender color combination of (pink+blue= lavender).It mean both alpha and beta phases exists.How to convert only beta phases.
sir PEG is a surfactant how it will dehydrate, its just added to get nanostructure like hexagonal platelet. Can i know the reaction between cobalt -PEG formation,its unclear for me .
Co(II) is more oxophilic, likes oxygen ligands. PEG has lots of oxygen donors and it is also multidentate. Probably thermodynamically and kinetically (one or the other or both, I am not sure) PEG is more favored to chelate Co(II). What is the molecular weight range of PEG you used. Looked at the cloud point, i.e., the temperature at which a surfactant sheds its water of hydration and precipitates. It may have a bearing on the process.
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