8 research outputs found
Oxo Peroxo Glycolato Complexesof Vanadium (V). Crystal Structureof (NBu4)2[V2O2(O2)2(C2H2O3)2]ċH2O
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Peroxido Complexes of Vanadium(V) as Ligands. Crystal Structures of [Cd(NH<sub>3</sub>)<sub>6</sub>][{VO(O<sub>2</sub>)<sub>2</sub>(OH)}<sub>2</sub>{μ-Cd(NH<sub>3</sub>)<sub>4</sub>}] and [{VO(O<sub>2</sub>)<sub>2</sub>(Im)}<sub>2</sub>{μ-Cu(Im)<sub>4</sub>}] (Im = Imidazole)
No full textTwo
novel heterometallic complexes [Cd(NH<sub>3</sub>)<sub>6</sub>][{VO(O<sub>2</sub>)<sub>2</sub>(OH)}<sub>2</sub>{μ-Cd(NH<sub>3</sub>)<sub>4</sub>}] (<b>2</b>) and [{VO(O<sub>2</sub>)<sub>2</sub>(Im)}<sub>2</sub>{μ-Cu(Im)<sub>4</sub>}] (<b>3</b>) (Im
= imidazole) containing peroxidovanadium complexes as metalloligands
were prepared and characterized by spectral methods. X-ray single-crystal
analysis revealed the presence of unique trinuclear complexes in the
crystal structures of <b>2</b> and <b>3</b>. The structure
of <b>2</b> contains an anionic complex, whose two {VO(O<sub>2</sub>)<sub>2</sub>(OH)}<sup>2–</sup> ions are interconnected
by a {μ-Cd(NH<sub>3</sub>)<sub>4</sub>}<sup>2+</sup> group.
Compound <b>3</b> is a trinuclear neutral complex comprising
two {VO(O<sub>2</sub>)<sub>2</sub>(Im)}<sup>−</sup> ions and
a single bridging {μ-Cu(Im)<sub>4</sub>}<sup>2+</sup> group.
The bonding via an equatorial OH<sup>–</sup> ligand in <b>2</b> and via a doubly bonded apical oxygen atom in <b>3</b> represents coordination modes previously unobserved for diperoxidovanadium
complexes. Compared with complex <b>2</b>, density functional
theory studies reported decreased Cu−μ-O bond orders
and increased μ-O–V bond orders in <b>3</b>, in
accordance with the expected Jahn–Teller distortion of the
latter complex
Racemic monoperoxovanadium(v) complexes with achiral OO and ON donor set heteroligands: synthesis, crystal structure and stereochemistry of [NH3(CH2)2NH3][VO(O2)(ox)(pic)]·2H2O and [NH3(CH2)2NH3][VO(O2)(ox)(pca)]
No full textVanadium(v) complexes of mandelic acid
No full textNew vanadium complexes of mandelic acid (NMe4)4[V2O4((R)-mand)2][V2O4((S)-mand)2] (1), (NMe4)2[V2O4((S)-mand)2]·H2O (2), (NEt4)2[V2O4((S)-mand)2]·H2O (3), (PPh4)2[V2O4((R)-mand)((S)-mand)]·2H3CCOCH3·2H2O (4), and (NH4)2.5(NEt4)0.5[V3O7((R)-mand)((S)-mand)]·2H2O (5) (mand2− = mandelato ligand) have been synthesized and characterized by single crystal X-ray diffraction and FT-IR spectroscopy. The band assignment in the IR spectra was corroborated by DFT calculations. While the structures of 1–4 comprise the expected dinuclear [V2O4(mand)2]2− (V2L2) anions, the structure of [V3O7((R)-mand)((S)-mand)]3− (V3L2) in 5 is unique and represents a new structural type in vanadium(V) chemistry. Solution studies of vanadate with mandelic acid by 51V NMR revealed the presence of two dominant species V2L2 and V3L2 in aqueous solutions and increasing fraction of V3L2 species at slightly acidic pH (pH ≈ 6)
