Nickel oxalate dihydrate

Non-isothermal kinetic studies [69] of the decomposition of samples of nickel oxalate dihydrate doped with Li and Cr showed no regular pattern of behaviour in the values of the Arrhenius parameters reported for the dehydration. There was evidence that lithium promoted the subsequent decomposition step, but no description of the role of the additive was given. 

At higher gas pressures, a buoyancy correction must be made to allow for the volume occupied by the sample this increases with pressure. The mass of gas displaced is given by MPV/RT, where P and V are pressure and volume of gas of molar mass M, and/ is the gas constant. During reactant decompositions, the volume of the residual sample changes for example, the nickel metal product formed on heating nickel oxalate dihydrate occupies only about 10% the volume of the reactant from which it was formed. Other corrections include the contributions from any gas flow in and around the balance mechanism and the effects of convection that increase with pressure. Some specific issues are discussed in the following text ... 

Figure 5.9 Structure of hydrazinium nickel oxalate dihydrate. Adapted from Ref. [20] with permission from Elsevier 1983.

A single-crystal X-ray study of the hydrazinium nickel oxalate dihydrate complex could not be carried out as the crystal shows twinning, rendering the X-ray investigation difficult. Therefore, based upon IR, UV spectra, and magnetic susceptibility data, the proposed structure of hydrazinium nickel oxalate dihydrate is represented as shown in Figure 5.9. In this case, apart from two bidentate (chelate), oxalate groups occupy the equatorial plane, while the axial positions are filled by hydrazinium cations. As a whole the nickel atom displays octahedral coordination. 

Nickel Oxalate. This salt, NiC204, mol wt 146.7, is produced as a greenish white crystalline dihydrate [6018-94-6]. It decomposes by heating at 320°C under vacuum into Ni metal and carbon dioxide. Nickel oxalate is used for the production of nickel catalysts and magnetic materials. 

Nickel Oxalate. This salt is pioduced as a greenish white ciystalline dihydrate. Nickel oxalate is used for the production of nickel catalysts and magnetic materials. 

Another Hydrogenation with Platinum Oxide. JACS, 55, 2694. This method is used to reduce those hydrox-mandelonitriles in the amphetamine section. It uses low pressure and can be used on about any reducible compound. It can also use palladium oxide as the catalyst. A solution of 35.8 g of phenyl-2-propanol in 250 ml of 80% ethanol containing 7.3 g of HCl is hydrogenated for 3 hours in a Parr hydrogenation bottle at 3,5kg/cm or 50 p.s.i, over 0,5 g of platinum oxide (or palladium oxide Raney nickel may also work) or an equimolar ratio of analog catalyst for about 3 hours. Filter off the catalyst and rinse with a little water to wash all the product from the catalyst. Dilute the filtrate to 1 liter of volume with water and extract twice with ether to remove any acid insoluble material. The ether extracts do not contain product. The aqueous layer is made alkaline with solid NaHCOs to a pH of 8-9 and the basic oil which separates is extracted with two 300 ml portions of ether. This ether solution is dried over MgS04, and filtered, then evaporated to remove the ether. To convert to the oxalate, add ether to the crude product and add to a solution of 9.6 g of oxalic acid dihydrate in a small volume of methanol. Give ample... 

Ferric oxide Guanidine hydrochloride Heparin ammonium Heparin lithium Hexane Hydrochloric acid Hydrocinnamic alcohol Hydrocinnamyl acetate Hydrogen sulfide Isophthaloyl dichloride Manganese dioxide a-Methylbenzyl alcohol Myrtrimonium bromide Nickel oxide (ic) Oxalic acid dihydrate o-Phenetidine Phenolsulfonic acid Phenoxyacetic acid Phenylacetaldehyde Phenylacetaldehyde dimethyl acetal Phenyl acetate Phenylacetic acid ... 

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