Copper I thiocyanate

Cupro-. cuprous, copper(I), cupro-. -chlorid, n. cuprous chloride, copper(I) chloride, -cy-aniir, n. cuprous cyanide, copper(I) cyanide cuprocyanide, cyanocuprate(I). -jodid, n. cuprous iodide, copper(I) iodide, -mangan, n. cupromanganese. -oxyd, n. cuprous oxide, copper(I) oxide, -salz, n. cuprous salt, cop-per(I) salt, -suifocyantir, n. cuprous thiocyanate, copper (I) thiocyanate, -verbin-dUDg, /. cuprous compound, copper(I) compound. 

Copper(II) compounds. Many other metallic ions which are capable of undergoing oxidation by potassium iodate can also be determined. Thus, for example, copper(II) compounds can be analysed by precipitation of copper)I) thiocyanate which is titrated with potassium iodate ... 

Determination of copper as copper(I) thiocyanate Discussion. This is an excellent method, since most thiocyanates of other metals are soluble. Separation may thus be effected from bismuth, cadmium, arsenic, antimony, tin, iron, nickel, cobalt, manganese, and zinc. The addition of 2-3 g of tartaric acid is desirable for the prevention of hydrolysis when bismuth, antimony, or tin is present. Excessive amounts of ammonium salts or of the thiocyanate precipitant should be absent, as should also oxidising agents the solution should only be slightly acidic, since the solubility of the precipitate increases with decreasing pH. Lead, mercury, the precious metals, selenium, and tellurium interfere and contaminate the precipitate. 

The precipitate, collected in a sintered-glass (porosity No. 4) or porcelain filtering crucible, may be weighed more rapidly as follows. Wash the copper(I) thiocyanate five or six times with ethanol, followed by a similar treatment with small volumes of anhydrous diethyl ether, then suck the precipitate dry at the pump for 10 minutes, wipe the outside of the crucible with a clean linen cloth and leave it in a vacuum desiccator for 10 minutes. Weigh as CuSCN. 

Determination as copper (I) thiocyanate, CuSCN. The solution (100 mL) should be neutral or slightly acid (hydrochloric or sulphuric acid), and contain not more than 0.1 g SCN . It is saturated with sulphur dioxide in the cold (or 50 mL of freshly prepared saturated sulphurous acid solution added), and then treated dropwise and with constant stirring with about 60 mL of 0.1M copper sulphate solution. The mixture is again saturated with sulphur dioxide (or 10 mL of... 

Aryl sulfones have been prepared from sulfinic acid salts, aryl iodides and Cul. Unactivated thiocyanation has been accomplished with charcoal supported copper(I) thiocyanate." ... 

O Regan B, Schwartz DT (1995) Efficient photo-hole injection from adsorbed cyanine dyes into electrodeposited copper(I) thiocyanate thin films p-type semiconductors. Chem Mater 7 1349-1354... 

Unactivated thiocyanation has been accomplished with charcoal supported copper (I) thiocyanate.97... 

The precipitate decomposes slowly to form white copper(I) thiocyanate and thiocyanogen is formed ... 

Copper(II) thiocyanate can be transformed to copper(I) thiocyanate immediately by adding a suitable reducing agent. A saturated solution of sulphur dioxide is the most suitable reagent ... 

IV.10 THIOCYANATES, SCN" Solubility Silver and copper(I) thiocyanates are practically insoluble in water, mercury(II) and lead thiocyanates are sparingly soluble the solubilities, in g t-1 at 20°, are 0-0003, 0 0005, 0-7, and 0-45 respectively. The thiocyanates of most other metals are soluble. 

Adding sulphurous acid (a saturated solution of sulphur dioxide) the precipitate turns into white copper(I) thiocyanate ... 

Black copper(II) thiocyanate turns red-brown on heating, and it is postulated that the product is derived from copper(I) thiocyanate distorted by the inclusion of thiocyanogen in the lattice (395). A zigzag chain structure analogous to AgSCN (492) has been suggested for CuNCS on the basis of their similar infrared spectra (502). 

Cu(NCS)2(trz)2] cannot be prepared from commercial Cu(NCS)2 because this substance is rather insoluble in most solvents and is usually very impure. A useful procedure is to start with freshly precipitated Cu(NCS)2, for instance from copper(U) nitrate and ammonium thiocyanate in water. Ammonium thiocyanate (0.2 mole, 15.22 g) in 50 mL of water is added to copper (II) nitrate trihydrate (0.1 mole, 24.16 g) in 100 mL of water. Copper(II) thiocyanate is precipitated immediately. After filtration and washing with water, it is dried under vacuum. The precipitate should be pitch-black any gray color is a sign of copper(I) thiocyanate. 

Transition Metal Compounds. - Dobado et al.119 used AIM to study the electronic properties of seven isomers of three-coordinated copper(I) thiocyanates, calculated at MP2 and B3LYP level using the 6-311 + G basis set. The results indicate that in the gas phase N-bonding is preferred to S-bonding. The coordination bond between the Cu(I) cation and the donor atoms is strongly polarised, almost ionic. The charge depletion around the Cu(I) cation is in accordance with sp2 hybridisation. Moreover, the canonical form for the non-coordinated as well as S-coordinated thiocyanates is mainly S-C=N, whereas the N-bonded thiocyanates have also N=C—S contribution. 

Barium thiocyanate was first prepared by Berzelius, who roasted barium hexacyanoferrate(II) with sulfur. It has also been obtained by reaction of barium carbonate with a solution of thiocyanic acid, by conversion of ammonium thiocyanate through the copper (I) thiocyanate by consecutive reactions with copper(I) chloride and barium hydroxide, by treatment of Prussian blue with barium sulfide, and by reaction of barium sulfide, sulfur, and cyanamide. The procedure described below makes possible the preparation of barium thiocyanate in any desired quantity from barium hydroxide and ammonium thiocyanate as starting materials. The 3-hydrate, " which is obtained first, is dehydrated readily to yield anhydrous barium thiocyanate. 

Cadmium carbonate CdC03 1.0 10- Copper(I) thiocyanate CuSCN 1.77 10- ... 

Copper(II) yields a black precipitate of copper(II) thiocyanate, which is transformed into copper(I) thiocyanate, itself dissolving into an excess of thiocyanate ions with the formation of the anionic complex Cu(SCN)2. The transformation cop-per(II) thiocyanate -> copper(I) thiocyanate is favored by the presence of reductants such as sulfite ions ... 

Li M-X, Wang H, Liang S-W et al (2009) Solvothermal synthesis and diverse coordinate structures of a series of luminescent copper(I) thiocyanate coordination polymers based on n-heterocyclic ligands. Cryst Growth Des 9 4626-4633... 

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