Fluorides s. a. Halides

Fluoresceins 21, 795 Fluoride ion catalyst, cesium fluoride as 21, 781 Fluorides (s. a. Halides, Replacement)... 

IV, A. Rittner s electrostatic model has been applied to the dissociation of metal halides (5) and Kapustinskii s equation to transition metal fluorides (26). A rough correlation between enthalpies of fluorides and the corresponding oxides and chlorides is suggested (22). 

CsCl HgCl2=3 1, 2 1, 1 1, 2 3, 1 2, and 1 5 and five caesium antimonious fluorides where CsF SbF3=l 1, 3 4, 4 7, 1 2, and 1 3. According to I. Remsen s rale (1889) When a halide of any element combines with a halide of an alkali metal to form a double salt, the number of molecules of the alkali salt which are added to one molecule of the other halide is never greater, and is generally less than the number of halogen atoms contained in the latter—for instance, in the double fluoride of sodium and aluminium, where the negative halide has three fluorine atoms, no more than three molecules of sodium fluoride will be found united with one of aluminium fluoride. 

The numerical values for these quantities have been extracted and summarized in Table V. These results did not surprise us, since they were predicted by ionic model calculations (19) as well as one ab initio Hartree-Fock calculation for lithium fluoride (20) (a subsequent one is also shown in Table V) which treated both monomer and dimer. However, the trend is opposite to that observed with metal and noble gas dimers, whose I.P. s are lower than the corresponding monomers. It is simply a consequence of the relative bonding strengths of the two units in the neutral and ionic forms. Alakll halide dimers are more stable as neutrals metal and noble gas dimers are generally more stable as ions. 

Hydrogen cyanide —, elimination of — s. De-hydrocyanation Hydrogen fluoride/boron fluoride 16, 833 Hydrogen halide acceptor, formamide as — 16,174 Hydrogen iodide 16, 570, 627, 983 17,18,32,119 Hydrogenolysis (s. a. Hydrocarbons, Replacement by hydrogen)... 

---