New Crown-Shaped Polyoxovanadium(V) Cluster Cation with a μ₆-Sulfato Anion and Zwitterionic μ-(β-Alanine):  Crystal Structure of [V₆O₁₂(OH)₃(O₂CCH₂CH₂NH₃)₃(SO₄)][Na][SO₄]·13H₂O

Abstract

Treatment of vanadium(V) oxide with an ethanol-concentrated sulfuric acid mixture, followed by the addition of an equimolar amount of beta-alanine and sodium hydroxide, and finally raising the pH to 3.9 with sodium carbonate solution, under continuous heating in a water bath and in the presence of air, leads to the polyionic sodium cyclo-[mu(6)-(sulfato-O,O',O'')tris[mu-(beta-alanine-O,O')-mu-oxo]tris(mu-hydroxo-mu-oxo)hexa[oxovanadium(V)]] sulfate tridecahydrate which crystallizes in the monoclinic P2(1)/n space group [a = 9.5192(4), b = 20.1185(9), c = 22.6174(9) A, beta = 97.011(1) degrees; Z = 4]. The crown-shaped polyoxovanadium(V) cluster cation, with carboxylate-bridging amino acid ligands, has an Anderson structure with two unique capping sulfato ligands. Its structural analysis, together with IR, UV-vis, and preliminary data on its solution properties, is presented.

A New Class of Ferromagnetically‐Coupled Mixed Valence Vanadium(IV/V) Polyoxometalates

“…These V 6 species are considered as derivatives of the hypothetical [V 6 V O 19 ] 8− structure 9. Planar V 6 rings have also been reported in the compounds [(V IV O) 6 (OH) 9 (CO 3 ) 4 ] 5− 10 and [(V V O) 6 (O) 6 (OH) 3 (O 2 CCH 2 CH 2 NH 3 ) 3 (SO 4 )] + ,11 as well as in the mixed valence V IV/V hexameric cluster [(V V O) 5 (V IV O)(O) 4 (PhCO 2 ) 9 ] 12. However, the molecular structures of the first two compounds consist of six edge‐sharing VO 6 octahedra (Anderson‐like structure3a) and the structure of the third one is made up of binuclear and tetranuclear units linked together by four benzoate groups.…”

A new self-assembled μ6-sulfato hexanuclear cobalt(II) complex of a symmetric dinucleating ligand: Synthesis and X-ray structural analysis

“…The difference of $192 cm À1 between the asymmetric and symmetric stretching vibrations is attributed to the two different binding modes of the carboxylate functionalities [28]. Also observed for complex 1 are the bands at 1207 and 1037 cm À1 which are the characteristic vibrations for the [M 6 (l 6 -SO 4 )] unit [16,29]. The electronic spectrum of complex 1 in aqueous solution shows several bands: one weak band at 739 nm (e, 13 Lmol À1 cm À1 ) and a broad intense band at 526 nm (e, 85 Lmol À1 cm À1 ) due to the d-d transitions.…”

Early‐Lanthanide Complexes with All‐Inorganic Macrocyclic Polyoxovanadate Ligands

“…Anderson‐like hexamolybdate structures that feature supported organic ligands with tetrahedral hetero units at the center have been investigated 5. Anion binding by a cyclic V 6 structure has also been reported 6. In these inorganic macrocyclic ligand systems, heteropolyoxometalates might represent structural model complexes for the active centers of heterogeneous oxide catalysis systems.…”