CrCl3 Chromium

C4H80-CrCl3 Chromium (III) chloride-tris (tetrahy drofuran), 8 150... 

Halides chromium chloride (CrCl3) chromium(III) chloride hexahydrate ([Cr OH2 6]Cl3). 

The thio- and seleno-phosphinato-complexes of chromium(iii), [Cr Se-(S)PR2 3] (R = Et or Ph) and [Cr Se(Se)PEt2 3], have been prepared by treating anhydrous or hydrated CrCl3 with the corresponding NaSe(X)PR2 salt, and characterized by their electronic and i.r. spectra. ... 

The Schiff base a-A -methyl-S-methyl-P-A -(2-pyridyl)methylenedithiocarba-zate (L) (66) behaves as a neutral terdentate ligand and [Cr(L)Cl3] has been isolated from reaction of the ligand and CrCl3,6H20 in ethanol. Pyruvic acid thio- and seleno-semicarbazones (H2L) complex with chromium(iii), to form species such as [Cr(L2)] and [Cr(L)(HL)]. ... 

A recent report describes the radioactive labeled chromium (iii) ion adsorption on stearic acid LB films. The adsorption of chromium (iii) on a stearic acid monolayer on the surface of CrCl3 was described. Stearic acid monomolecular films on I0 3 M CaCl2 subsolutions were deposited in paraffin-coated microscope glass slides by the LB technique (pH range 2-9). 

The preparation of salts containing the [Cr(en)3]3+ cation from anhydrous chromium sulfate has been described previously in Inorganic Syntheses,1 and the merits of this, and other, methods have been reviewed.9 A more rapid route to this cation involves refluxing CrCl3 6H20 in methanol with ethylenediamine and zinc metal, which allows the substitution to proceed by way of the kineti-cally labile chromium(II) species.10 All of these preparations yield hydrated salts the procedure described below leads to anhydrous [Cr(en)3] Br3. 

For vanadium and chromium the first ionization energies are much lower than the first ionization energies of phosphorus and sulphur, respectively. This explains the high heats of formation of VC13 and CrCl3. In uranium, the tetravalent state is more stable than that in tungsten because uranium as an actinide has a different electron configuration. 

A method which gives a chromium(II)-substituted alkoxide ([Cr(OCBu3)2 LiCl(THF)2], Section 35.3.5.2) directly from CrCl3 is to add a solution of the alcohol previously treated with BuLi to a slurry of the halide in THF.77 How the reduction to chromium(II) takes place has not been clarified. 

The complex [Cr(OCBu3)2 LiCl(THF)2], which was obtained according to Scheme 15,77 has a unique structure. The metal ion is three-coordinate, and the donor atoms outline a distorted T (22). It is not obvious how the reduction occurs because the BuLi is added in stoichiometric quantity to the alcohol and this solution then added to the CrCl3 suspension. Since LiCl is eliminated on the addition of hexane to give [Cr(OCBu3)2(THF)2], Scheme 15 may provide a simpler route to chromium(II) alkoxides than that from the very air- and moisture-sensitive complex [Cr N(SiMe3)2 2(THF)2]. 

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