Boron Cluster Anions [B_nH_n]^2– (n = 10, 12) in Reactions of Iron(II) and Iron(III) Complexation with 2, 2′‐Bipyridyl and 1, 10‐Phenanthroline

Abstract

Complexation of Fe II and Fe III with azaheterocyclic ligands L (L = phen or bipy) were studied in the presence and in the absence of boron cluster anions [B n H n ] 2-(n = 10, 12). The reactions were carried out in air at room temperature in organic solvents and/or water. In all the solvents used, well known [FeL 3 ]An (An = 2Clor SO 4 2-) ferrous complexes were formed from Fe II salts. Composition of ferric complexes with L ligands depends on the nature of solvent: either * Dr. V. V. Avdeeva Fax: +7-495-954-12-79 E-Mail: avdeeva.varvara@mail.ru [a] N.

Fe(III) bipyridyl or phenanthroline complexes with oxidase‐like activity for sensitive colorimetric detection of glutathione

“…Fe(III)-L 3 complexes were prepared in accordance with previously published methods. [8,21] Here, 1 ml of ligand in DMF (3 mM) was placed in a glass vial. Then, 1 ml of an aqueous Fe 3+ salt solution (1 mM) was added into the same vial at room temperature and an orange solution was immediately obtained.…”

“…Phen or 2,2-bipyridine (Bpy) are polypyridine derivatives [2] that always have bidentate heterocyclic ligands. [8] They have attracted substantial interest in the fields of inorganic, organic and supramolecular chemistry [9,10] for the synthesis of materials such as organic-metal frameworks. [11] For this structure-reactivity correlation, Fe-Phen or Fe-Bpy complexes have been reported as catalysts for oxidation.…”

Boron cluster anions [B n H n ]2− (n = 10, 12) in the formation of binuclear iron(II) complexes with bridging CO3 group and azaheterocyclic ligands L (L = Bipy, Phen)

“…A correlation between structure and magnetic properties was made for tetranuclear complex [(Cu 4 (Bipy) 4 (OH) 4 (B 10 H 10 ) 2 (DMSO) 2 ] in the work [3]. [9]. Binuclear iron complexes with boron cluster anions have not been described in the literature.…”

“…According to elemental analysis and IR spectros copy data, compounds I-IV correspond to complexes of general formula [FeL 3 ][B n H n ] previously prepared and described in [9]. This work reports the data of IR and 11 B NMR spectroscopy, elemental analysis of complexes I-IV and the structure of complexes II ⋅ DMF, III, III ⋅ CH 3 CN, and IV ⋅ 0.75CH 3 CN.…”

“…A series of iron(III) complexes of different structure can be isolated in the absence of closo borate anions [9], however, the addition of [B n H n ] 2-anions into reaction mixture leads to redox reaction accompanied by the partial degradation of [B n H n ] 2-anions to give only [FeL 3 ][B n H n ] complexes [9]. The high stability of cat ionic complexes [FeL 3 ] 2+ , which readily form in reac tion solution under the action of even weak reducing agents, favors the formation of iron(II) complexes from iron(III) salts.…”