METAL COORDINATION-COMPOUNDS PREPARED IN ACETIC-ACID .1. CHLOROMETALATES(III) OF IRON, CHROMIUM, AND VANADIUM

Ternary chloride-hydrates A(2)MCl(5) . H2O (A = Cs, Rb, (K)) can be pr ecipitated with HCl from solutions of MCl(3) . 6H(2)O, (M = Fe, Cr, V) and alkali metal acetates in acetic acid. Under special conditions al so compounds of the composition Cs(3)MCl(6) . H2O can be obtained. Aft er dehydration of the solutions with acetyl chloride, anhydrous compou nds are formed: Cs3Fe2Cl9; A(3)CrCl(6) and A(3)Cr(2)Cl(9) with A = Cs, Rb; Cs3VCl6 and Cs3V2Cl9. V-III is partially oxidized to V-IV by an e xcess of acetyl chloride. Compounds A(2)VCl(6) with A = Cs, Rb can be obtained more conveniently by the reaction of VOCl2 . H2O in acetic ac id with acetyl chloride. The lattice parameters of some compounds were determined from powder patterns in analogy to known structure familie s.