The synthesis of coordinations compounds orcomplexes formed by organic molecules and metal centers is an important areawithin organometallic chemistry ¹. The most common function of metalcomplexes is to catalyze chemical reactions. Noble metal complexes withspecific ligands are the most frequently used. One significant advance in thestudy of metal catalyzed reactions is the use of the halides of transitionmetals iron (Fe), copper (Cu) and zinc (Zn) as catalyst ². However,many salts are not stable in the air under normal laboratory conditions andthey can only be used in one reaction cycle. On the other hand complexesbetween these salts and cyclodextrins (CD) have been shown to be stable andgood catalyst that can be recovered and reused in sulfoxidation reactions³.

 We report here on the synthesis of complexesof brominated metal salts Fe (II), Fe (III), Zn (II), Cu (II), Al (II) and Mn(II) with gamma cyclodextrin (yCD) using ethyl acetate as solvent. Thecomplexes were characterized by IR, TGA and UV-Vis RD, and they showed goodstability under normal environmental conditions. The results were compared withthose obtained for complexes synthesized previously in dichloromethane. InFigure 1 it is shown the IR spectra of the complexes of g-CD / FeBr₂ obtained indichloromethane and in ethyl acetate together with that of the native g-CD.