Cobalt(II) Iodate Crystals

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Cobalt(II) iodate (CoI2) is an inorganic compound formed by treating cobalt powder with gaseous hydrogen iodide. It is a black crystalline solid with a slight iodine-like smell. When heated and decomposed, it emits toxic iodine and nitrogen oxide fumes. It is used as a moisture and humidity indicator, and as a catalyst. It is also used to determine the presence of water in various solvents and as a reagent for carbonylation reactions, especially the reaction of diketene with Grignard reagent.

Several metal tartrate crystals have been reported in literature, such as pure iron tartrate [1], ternary cobalt-manganese-cobalt tartrate compounds [2], and lead-cadmium mixed levo tartrate crystals [3]. Despite of the many reports of pure cobalt tartrate hydrate, there are no comprehensive studies about its physical properties including thermal behaviour.

To characterize the crystal, we have grown cobalt tartrate hydrate single crystals in silica gel using simple gel technique. The crystal morphology and structure were studied by scanning electron microscopy (SEM). Powder X-ray diffraction showed that the cobalt tartrate hydrate has orthorhombic crystal structure with a clear and defined hydration zone. Fourier transform infrared spectroscopy confirmed that the cobalt tartrate hydrate consists of O-H, C-O and metal-oxygen bonds.

The specific heat of the crystals is determined by differential scanning calorimetry at different temperature ranges to study the hydration behaviour. The results indicate that the cobalt tartrate hydrate crystal has Curie-Weiss behaviour with a critical temperature of 1.4 K, which is in agreement with previous results from specific heat measurements.

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