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Briefly, cobalt (II) chloride
hexahydrate (CoCl2·6H2O, Sinopharm Chemical Reagent Co.
Ltd), sodium chloride (NaCl, Shanghai Lingfeng Chemical
Regent Co. Ltd) and hexamethylene tetramine (HMT,
Sinopharm Chemical Reagent Co. Ltd) were dissolved in 100
cm3 of a 9:1 mixture of ultrapure water and anhydrous
ethanol, giving the final concentrations of 10, 40 and 60 mM,
respectively. Then the reaction solution was heated at 90 oC in
the oil bath under magnetic stirring. After being heated for
about 1 h, the pink solution turned from pink color to green
color. Solid products were collected by centrifugation at 6000
rpm for 5 min, washed with ultrapure water and anhydrous
ethanol for several times. The final products were air-dried at
room temperature.
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