CESIUM FLUORIDE-BROMINE INTERCALATION COMPOUNDS

CsF reacts with Br-2 to form the two intercalation compounds CsF . Br- 2 and 2CsF . Br-2. The former consists of layers of CsF squares separa ted by layers of Br-2 molecules oriented perpendicular to the CsF laye rs. 2 CsF . Br-2 is a second-stage compound, composed of two layers of CsF followed by one layer of bromine molecules. Iodine cannot replace bromine; instead, it reacts with CsF to form Cs2I8, and probably CsIf (6) between 0 degrees and 120 degrees C. Chlorine does not react at al l with CsF. Bromine reacts with RbF only superficially, and after a lo ng time some RbBr3 is observed; RbF and I-2 give RbI3.