Graphite alkali compounds

These may be prepared with melts or vapor of the alkali metals K, Rb and Cs. Depending on the proportions and/or the reaction temperature, the compounds resulting have the following approximate compositions CgM (1st stage), 

The preparation corresponds to that for CgK but the furnace is kept at 360°C. The end of the conversion is identified by the 

These are prepared from a stoichiometric mixture of graphite powder or flakes and K metal by heatii for 20 hours at 300 to 400°C in an evacuated, sealed tube. 

Rubidium graphite and cesium graphite are prepared In similar fashion. 

Analysis. After weighii, the tubes containing the substance are cut open and the contents are discharged into a preheated 

---

The stereochemical interpretation of the alkali-graphite compounds may also be explained in this way (57). If the volume of graphite is deducted from the molecular value of the compound CgMe, the alkali metal increments shown in Table III, column 2, are obtained. Compari-... 

Alkali-Graphite Compounds with Atomic and Ionic Volumes... 

The polar character of the alkali-graphite compounds also explains readily why the regular sequence of Me and C layers is maintained, even in the alkali-poor stage, for the electropositive alkali layers will always tend, because of mutual repulsion, to distribute themselves as uniformly as possible over the whole graphite lattice. 

First reported by Fredenhagen in 1926 F3, F4), the graphite-alkali-metal compounds possess a relative simplicity with respect to other intercalation compounds. To the physicist, their uncomplicated structure and well defined stoichiometry permit reasonable band-structure calculations to be made S2,12) to the chemist, their identity as solid, "infinite radical-anions frequently allows their useful chemical substitution for such homogeneous, molecular-basis reductants as alkali metal-amines and aromatic radical anions N2, B5). 

Thermodynamic information has been obtained in different stages of graphite bisulfate (A5). The results have been interpreted in terms of a model previously applied to alkali-metal-graphite compounds. Part of... 

Alkali-metal-graphite compounds Williams, N. E., private comm., 1968... 

Band structure cesium auride, 25 240-241 graphite-alkali metal compounds, 23 287 Band theory, for one-dimensional electrical Conductors, 26 237-241 Barbituric acid, 18 187 Barium... 

Tatar, R. C. 1985. A theoretical study of the electronic structure of binary and ternary first stage alkali intercalation compounds of graphite. PhD Thesis, University of Pennsylvania, PA. 

Watanabe K, Knodow T, Soma M, Onishi T, Tamaru K (1973) Molecular-sieve type sorption on alkali graphite intercalation compounds. Proc. Roy. Soc. Lond. A. A333 51-67... 

Review of Process Alternatives, Superior Graphite began in 1968 to investigate possible alternatives for desulfurization of petroleum cokes. The methods considered included various chemical treatments and direct thermal purification processes. The chemical treatment methods included hydrodesulfurization and reactions with various alkali metal compounds. Fine grinding of the coke appeared to be required and reaction conditions generally involved high pressure. 

Solin SA, Caswell N (1981) Raman-scattering from alkali graphite-intercalation compounds. J Raman Spectrosc 10(1) 129-135... 

Reduction by Alkali Metals. This was the first reduction method successfully used it is particularly useful for reducing in liquid ammonia cyanides ( ), alkynyls (f 4 ), ammines (193) and ethylendiammines (192). The same reaction on phosphine compounds gives low yields because the reagents are insoluble in liquid ammonia (45). The zero valent nickel compounds with phosphites are obtained in good yield with the potassium graphite compound KCs (110). 

---