Yu.V. Isaev

Lamellar graphite compounds with potassium and benzene: structure and transformations

Abstract The thermal, oxidation and hydrolytic stabilities of the ternary lamellar graphite compound C 24 K(C 6 H 6 ) 3 have been investigated. The results of the study have suggested a model C 24 K(C 6 H 6 ) 3 structure according to which benzene penetrates both the interlayer space containing potassium and the unfilled interlayer graphite space, the benzene molecules being arranged at right angles to the carbon layers of graphite.

A novel type of reaction in the chemistry of graphite intercalation compounds. The preparation of alkali metal graphite intercalation compounds by ion exchange reactions

Abstract The treatment of KC8 or KC24 with a solution of LiCl or LiClO4 in tetrahydrofuran (THF) results in the exchange of K+ions in the GIC for Li+ ions. Depending on the ratio salt/GIC, ternary Li-THF-GICs with either d i = 12.5 A or d i = 7.16 A 5 have been obtained. Analogous reactions between KC8 or KC24 and solutions of NaI in THF lead to the formation of Na-THF-GIC with d i = 11.2 A . The same GIC was prepared by reactions of LiC6 or LiC12 and solutions of NaI in THF. Li-THF-GIC can be also obtained by reacting Na(NH3)xC14 with solutions of LiCl in THF. A model to explain the mechanism of ion exchange of intercalated alkali metal ions with ions in THF solution is proposed.

Molecular dynamics in the ternary intercalation compounds of graphite with potassium and benzene

Abstract The proton spin-lattice relaxation was studied in the ternary graphite intercalation compound (GIC) KC 24 (C 6 H 6 ) 2.8 ± 0.2 . The relaxation was governed by the reorientations of the benzene molecules, and two types of benzene molecules with different reorientation behaviour were observed in this compound. In the thermal decomposition product of KC 24 (C 6 H 6 ) 2.8 ± 0.2 the relaxation proceeded via the paramagnetic centers.

New biintercalation GICs. The interaction of benzene with amalgam GICs

Abstract The interaction of benzene with ternary GICs MHgC8 (M = K, Rb) has been investigated and new quaternary compounds MHgC8(C6H6)2 were obtained. X-ray data, Fourier transform of 001 reflections and spin-lattice relaxation measurements show that benzene molecules intercalate into the empty galleries of the amalgam GICs.

Ternary lamellar graphite compounds with potassium and methylbenzenes

Abstract The interaction between a second stage lamellar graphite compound (LGC) and potassium (KC 24 ) and toluene, o -, m - and p -xylenes and mesitylene has been studied. Ternary LGCs with toluene and o -xylene have been derived, their thermal and oxidation stabilities have been examined and their structures are discussed. It is shown that the intercalation of toluene and o -xylene into KC 24 is reversible.

Molecular motions in the ternary graphite intercalation compounds with potassium and methylbenzenes

Abstract Molecular dynamics in the ternary graphite intercalation compounds (GICs) with potassium and methylbenzenes (toluene and o -xylene) have been investigated. It was found that the proton spin-lattice relaxation is determined by two different molecular motions. At low temperatures the relaxation process is monitored by the three-fold methyl group reorientations. At high temperatures the motion is most likely to be the rotation of the phenyl ring around the two-fold axes. The relaxation measurements are discussed in terms of the previously proposed structure model of the ternary GICs with potassium and aromatic hydrocarbons.

New method for synthesis of lamellar compounds of graphite with lithium

ConclusionsThe stirred reaction of graphite with molten lithium gave compounds of composition C6Li, C12Li, and C18Li, for which the identity periods and thicknesses of the filled layers were determined.