Studies in the complexes of anthrones with metal halides. III. Complexes of anthrones with the halides of some metals of groups V, VI and VIII

Abstract

Benzanthrone forms solid 1:1 complexes with the chlorides and bromides of antimony (V), bismuth(III) and iron(III), and 2:1 adducts with those of tellurium(IV) while anthrone and 10-nitroanthrone react with antimony(V)chloride only to yield 1:1 compounds. Halides of arsenic(III) and antimony(III) do not form solid compounds with anthrones. The antimony(V) halide complexes are non-ionic and monomeric in nitrobenzene; the benzanthrone complex can be sublimed undecomposed at 90°/2 mm. The tellurium(IV) halide complexes decompose into thermally unstable 1:1 products during thermogravimetric analysis. Infra-red spectral studies reveal the formation of metal-oxygen bonds in the complexes and the weakness of bromides as Lewis acids against corresponding chlorides except in case of the tellurium(IV) halides where a reverse order has been indicated. Magnetic susceptibilities of the iron complexes have also been determined which agree with the values calculated for 5 unpaired electrons.