Interaction of Co(acac)2 and Ta(OMe)5: isolation and single crystal study of the products. MII2MV2(acac)2(OMe)12, MII = Co, Ni, Zn or Mg and MV = Ta or Nb: A new class of heterometallic heteroleptic alkoxide complexes

Synthesis of heterobimetallic tungsten acetylacetonate/alkoxide complexes and their application as molecular precursors to metal tungstates

“…Following the methodology used to prepare the analogous molybdenum compounds, [20] heterobimetallic We also now report the structure of Na[Zn(acac) 3 ] (6), formed unintentionally in the zinc variation of Eqn. 5.…”

“…Complexes 1 -4 can be prepared by an adaptation of literature methodology previously used to successfully prepare analogous molybdenum compounds. [20] However, in the cases of 1 -3 an alternative route, in which M(acac)(OMe) M = Co, Ni, Mg) was first prepared and isolated, proved to be less wasteful of reagents and is described below; only in the case of 4 was this alternative procedure unsuccessful. The total recovered mass of the above RAPET reactions are respectively 62% and 59%.…”

“…On cooling to 233 K, this broad signal splits into two (4.46, 4.58 ppm), which implies a more facile exchange between these two OMe environments in the case of the zinc compound. The related compound Mg 2 Ta 2 (acac) 2 (OMe) 12 displays similar behavior of intermolecular exchange but seems to involve a different pair of methoxy groups i.e bridging µ 2 -and µ 3 -OMe; molecular rigidity at ambient temperature has, however, been noted for Zn 2 Ta 2 (acac) 2 (OMe) 12 [20].…”

Effect of Electron Donors on the Radical Polymerization of Vinyl Acetate Mediated by [Co(acac)2]: Degenerative Transfer versus Reversible Homolytic Cleavage of an Organocobalt(III) Complex

“…X-ray crystallographic analyses of numerous derivatives (e.g. ED = H 2 O, [33,35] MeOH, [36] pyridine, [37] or imidazole, [38] ), revealed that these complexes have a trans-octahedral geometry, as shown in Scheme 2c. All these observations indicate the propensity of [CoA C H T U N G T R E N N U N G (acac) 2 ] to establish weak coordinative interactions with electron donors leading to octahedral coordination.…”

Electrochemical synthesis and crystal structure studies of defective dicubane tetranuclear hydroxo and carboxamide ligand bridged cobalt(II)–cobalt(III) complexes with carboxamides produced from unprotected hydroxyaromatic carboxylic acids

“…Such assemblies represent hexagonal closest packing and are comparatively common in solid-state chemistry [36]. They have been found for instance in [(Ti,Zr) 4 (O-alkyl) 16 ] complexes [37], in a variety of salts of [(Sb III ,Bi III ) 4 (Cl,Br,I) 16 ] 4À anions like [Mg(CH 3 CN) 6 ] 2 [Bi 4 Cl 16 ] [38], and in a considerable variety of transition metal complexes with polyfunctional organic ligands [30,31,39].…”