Hexanuclear complexes of molybdenum(V) containing [Mo 6O 12(OCH 3) 4(acac) 3] − anion

• Published in: Polyhedron 2000-06, Vol.19 (12), p.1471-1478
• Main Authors: Cindrić, Marina, Pavlović, Gordana, Vrdoljak, Višnja, Kamenar, Boris
• Format: Article
• Language: English
• Subjects: Crystal structures; Hantzsch synthesis; Hexanuclear molybdenum(V) complexes; Molybdenum; Oxocluster complexes
• ISSN: 0277-5387
• DOI: 10.1016/S0277-5387(00)00405-8

The novel hexanuclear oxoclusters of the general formula R[Mo 6O 12(OCH 3) 4(acac) 3] ( 1– 7), where R=CH 3NH 3 ( 1), C 5H 5NH ( 2), (CH 3) 2CHNH 3 ( 3), (CH 3) 3CNH 3 ( 4), C 5H 11NH ( 5), (C 2H 5) 3NH ( 6), and C 6H 5NC 11H 13O 2 ( 7) have been obtained by the reactions of the binuclear oxomolybdenum(V) complex [Mo 2O 3(acac) 4] (acac=acetylacetonate ion) with a variety of alkyl or aryl amines or corresponding alkyl or aryl ammonium chlorides in methanol. The formation of 3,5-diacyl-2,6-dimethyl-1-pheny-l-pyridinium cation in 7 is explained by the cyclization via Hantzsch condensation of acetylacetone, formaldehyde and aniline. The molecular structures of complexes 5, 6 and 7 have been determined by a single-crystal X-ray diffraction study. In all salts the anion is of hexanuclear nature in which molybdenum atoms are bridged by oxo-oxygen and methoxo-oxygen atoms. Six Mo-octahedra are fused through edges, thus allowing the formation of localized metalmetal bonds between three pairs of molybdenum atoms.