Zirconium monochloride

Monovalent Halides. Zirconium monochloride [14989-34-5], ZrCl, was discovered during electrorefining studies of zirconium in a SrCl2—NaCl—ZrCl4 melt intended to produce pure ductile hafnium-depleted zirconium from cmde zirconium anodes (180—181). The monochloride is also called Zirklor. It is obtained as black flakes with a graphite sHp-plane behavior and was proposed as a lubricant (182,183). 

Zirconium monochloride and zirconium monobromide [31483-18-8] are prepared in better purity by equiUbration of mixed lower haUdes with zirconium foil at 625°C (184—185) or by slowly heating zirconium tetrahaUde with zirconium turnings at 400—800°C over a period of two weeks and hoi ding at 800—850°C for a few additional days (186). Similar attempts to produce zirconium monoiodide [14728-76-8] were unsuccesshil it was, however, obtained from the reaction of hydrogen iodide with metallic zirconium above 2000 K (187). 

Zirconium monochloride reacts with sodium ethoxide to form additional adducts which hydrolyze in water. The monochloride does not react with benzene in a Friedel-Crafts reaction, and does not enter into intercalation reactions similar to those of zirconium disulfide. Both monohaUdes add hydrogen reversibly up to a limiting composition of ZrXH (131). 

Zirconium monochloride, 26 646, 647 Zirconium organometallic compounds as catalysts, 26 656-657 Zirconium oxide... 

Zirconium monochloride mono(0-2,4-di-t-butyl)benzene 2THF (1)... 

Under the current reaction conditions, H-NMR reaction monitoring indicated that a 4 1 isomeric product ratio of pseudo-rac and meso dimethylsilanediylbis(2-methyl-4,5-benzo-indenyl)zirconium monochloride mono(2,4-di-t-butylphenoxide), (I), and (II), respectively, were formed. The isomers were separated by extracting the racemic mixture with hot toluene. 

Zirconium monochloride and monobromide are black powders or highly reflective microcrystals. Although the monohalides appear to be stable in air for days to weeks, they should be kept and handled under inert atmospheres if high purity is required, owing to a probable slow reduction of water vapor to form the hydrides (see below) and Zr02. These monohalides possess a rhombohedral (R3m), three-slab structure in which each slab consists of four tightly bound,... 

Zn3As2 ZINC ARSENIDE 1829 ZtCI[g] ZIRCONIUM MONOCHLORIDE (GAS) 1861... 

TS1/KHO] Tsirel nikov, V. 1., Khodeev, Y. S., Troyanov, S. 1., Thermal disproportionation of zirconium monochloride, Russ. J. Phys. Chem., 47, (1973), 884. Cited on page 168. 

ADO/COR] Adolphson, D. G., Corbett, J. D., Crystal structure of zirconium monochloride. A novel phase containing metal-metal bonded sheets, Inorg. Chem., 15, (1976), 1820-1823. Cited on page 167. 

DAA/COR] Daake, R. L., Corbett, J. D., Zirconium monobromide, a second double metal sheet structure. Some physical and chemical properties of the metallic zirconium monochloride and monobromide, Inorg. Chem., 16, (1977), 2029-2033. Cited on pages 167, 173. 

MAK/GAN] Makarov,A. V., Ganin, V. V., Troyanov, S. I., Nikitin, O. T., Mass spectrometric study of vapor over zirconium monochloride, Moscow Univ. Chem. Bull, 40, (1985), 107. Cited on page 168. 

EFI/PRO] Efimov, M. E., Prokopenko, 1. V., Tsirelnikov, V. 1., Medvedev, V. A., Berezovskii, G. A., Paukov, 1. E., Thermodynamic properties of zirconium chlorides. 11. The standard molar enthalpies of formation, the low-temperature heat capacities, the standard molar entropies, and the standard molar Gibbs energies of formation of zirconium monochloride, zirconium dichloride and zireonium tetrachloride, J. Chem. Thermodyn., 21, (1989), 677-685. Cited on pages 158, 159, 160, 161, 167, 168,337. 

The above reaction in 1 6 molar ratio afforded zirconium monochloride triacetate ZrCl(OAc)3. The formation of acetate derivatives of the tertiary butoxide was confirmed by the reaction of zirconium tetrachloride with excess of tertiary butylacetate,... 

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