3 research outputs found
pH-Specific Structural Speciation of the Ternary V(V)–Peroxido–Betaine System: A Chemical Reactivity-Structure Correlation
Vanadium involvement in cellular processes requires deep
understanding of the nature and properties of its soluble and bioavailable
forms arising in aqueous speciations of binary and ternary systems.
In an effort to understand the ternary vanadium–H<sub>2</sub>O<sub>2</sub>–ligand interactions relevant to that metal ion’s
biological role, synthetic efforts were launched involving the physiological
ligands betaine (Me<sub>3</sub>N<sup>+</sup>CH<sub>2</sub>CO<sub>2</sub><sup>–</sup>) and H<sub>2</sub>O<sub>2</sub>. In a pH-specific
fashion, V<sub>2</sub>O<sub>5</sub>, betaine, and H<sub>2</sub>O<sub>2</sub> reacted and afforded three new, unusual, and unique compounds,
consistent with the molecular formulation K<sub>2</sub>[V<sub>2</sub>O<sub>2</sub>(O<sub>2</sub>)<sub>4</sub>{(CH<sub>3</sub>)<sub>3</sub>ÂNCH<sub>2</sub>CO<sub>2</sub>)}]·H<sub>2</sub>O (<b>1</b>), (NH<sub>4</sub>)<sub>2</sub>[V<sub>2</sub>O<sub>2</sub>(O<sub>2</sub>)<sub>4</sub>{(CH<sub>3</sub>)<sub>3</sub>ÂNCH<sub>2</sub>CO<sub>2</sub>)}]·0.75H<sub>2</sub>O (<b>2</b>),
and {Na<sub>2</sub>[V<sub>2</sub>O<sub>2</sub>(O<sub>2</sub>)<sub>4</sub>{(CH<sub>3</sub>)<sub>3</sub>ÂNCH<sub>2</sub>CO<sub>2</sub>)}<sub>2</sub>]}<sub><i>n</i></sub>·4<i>n</i>H<sub>2</sub>O (<b>3</b>). All complexes <b>1</b>–<b>3</b> were characterized by elemental analysis; UV/visible, FT-IR,
Raman, and NMR spectroscopy in solution and the solid state; cyclic
voltammetry; TGA-DTG; and X-ray crystallography. The structures of <b>1</b> and <b>2</b> reveal the presence of unusual ternary
dinuclear vanadium–tetraperoxido–betaine complexes containing
[(V<sup>V</sup>î—»O)Â(O<sub>2</sub>)<sub>2</sub>] units interacting
through long V–O bonds. The two VÂ(V) ions are bridged through
the oxygen terminal of one of the peroxide groups bound to the vanadium
centers. The betaine ligand binds only one of the two VÂ(V) ions. In
the case of the third complex <b>3</b>, the two vanadium centers
are not immediate neighbors, with Na<sup>+</sup> ions (a) acting as
efficient oxygen anchors and through Na–O bonds holding the
two vanadium ions in place and (b) providing for oxygen-containing
ligand binding leading to a polymeric lattice. In <b>1</b> and <b>3</b>, interesting 2D (honeycomb) and 1D (zigzag chains) topologies
of potassium nine-coordinate polyhedra (<b>1</b>) and sodium
octahedra (<b>3</b>), respectively, form. The collective physicochemical
properties of the three ternary species <b>1</b>–<b>3</b> project the chemical role of the low molecular mass biosubstrate
betaine in binding VÂ(V)–diperoxido units, thereby stabilizing
a dinuclear VÂ(V)–tetraperoxido dianion. Structural comparisons
of the anions in <b>1</b>–<b>3</b> with other known
dinuclear VÂ(V)–tetraperoxido binary anionic species provide
insight into the chemical reactivity of VÂ(V)–diperoxido systems
and their potential link to cellular events such as insulin mimesis
and anitumorigenicity modulated by the presence of betaine
pH-Specific Structural Speciation of the Ternary V(V)–Peroxido–Betaine System: A Chemical Reactivity-Structure Correlation
Vanadium involvement in cellular processes requires deep
understanding of the nature and properties of its soluble and bioavailable
forms arising in aqueous speciations of binary and ternary systems.
In an effort to understand the ternary vanadium–H<sub>2</sub>O<sub>2</sub>–ligand interactions relevant to that metal ion’s
biological role, synthetic efforts were launched involving the physiological
ligands betaine (Me<sub>3</sub>N<sup>+</sup>CH<sub>2</sub>CO<sub>2</sub><sup>–</sup>) and H<sub>2</sub>O<sub>2</sub>. In a pH-specific
fashion, V<sub>2</sub>O<sub>5</sub>, betaine, and H<sub>2</sub>O<sub>2</sub> reacted and afforded three new, unusual, and unique compounds,
consistent with the molecular formulation K<sub>2</sub>[V<sub>2</sub>O<sub>2</sub>(O<sub>2</sub>)<sub>4</sub>{(CH<sub>3</sub>)<sub>3</sub>ÂNCH<sub>2</sub>CO<sub>2</sub>)}]·H<sub>2</sub>O (<b>1</b>), (NH<sub>4</sub>)<sub>2</sub>[V<sub>2</sub>O<sub>2</sub>(O<sub>2</sub>)<sub>4</sub>{(CH<sub>3</sub>)<sub>3</sub>ÂNCH<sub>2</sub>CO<sub>2</sub>)}]·0.75H<sub>2</sub>O (<b>2</b>),
and {Na<sub>2</sub>[V<sub>2</sub>O<sub>2</sub>(O<sub>2</sub>)<sub>4</sub>{(CH<sub>3</sub>)<sub>3</sub>ÂNCH<sub>2</sub>CO<sub>2</sub>)}<sub>2</sub>]}<sub><i>n</i></sub>·4<i>n</i>H<sub>2</sub>O (<b>3</b>). All complexes <b>1</b>–<b>3</b> were characterized by elemental analysis; UV/visible, FT-IR,
Raman, and NMR spectroscopy in solution and the solid state; cyclic
voltammetry; TGA-DTG; and X-ray crystallography. The structures of <b>1</b> and <b>2</b> reveal the presence of unusual ternary
dinuclear vanadium–tetraperoxido–betaine complexes containing
[(V<sup>V</sup>î—»O)Â(O<sub>2</sub>)<sub>2</sub>] units interacting
through long V–O bonds. The two VÂ(V) ions are bridged through
the oxygen terminal of one of the peroxide groups bound to the vanadium
centers. The betaine ligand binds only one of the two VÂ(V) ions. In
the case of the third complex <b>3</b>, the two vanadium centers
are not immediate neighbors, with Na<sup>+</sup> ions (a) acting as
efficient oxygen anchors and through Na–O bonds holding the
two vanadium ions in place and (b) providing for oxygen-containing
ligand binding leading to a polymeric lattice. In <b>1</b> and <b>3</b>, interesting 2D (honeycomb) and 1D (zigzag chains) topologies
of potassium nine-coordinate polyhedra (<b>1</b>) and sodium
octahedra (<b>3</b>), respectively, form. The collective physicochemical
properties of the three ternary species <b>1</b>–<b>3</b> project the chemical role of the low molecular mass biosubstrate
betaine in binding VÂ(V)–diperoxido units, thereby stabilizing
a dinuclear VÂ(V)–tetraperoxido dianion. Structural comparisons
of the anions in <b>1</b>–<b>3</b> with other known
dinuclear VÂ(V)–tetraperoxido binary anionic species provide
insight into the chemical reactivity of VÂ(V)–diperoxido systems
and their potential link to cellular events such as insulin mimesis
and anitumorigenicity modulated by the presence of betaine
pH-Specific Structural Speciation of the Ternary V(V)–Peroxido–Betaine System: A Chemical Reactivity-Structure Correlation
Vanadium involvement in cellular processes requires deep
understanding of the nature and properties of its soluble and bioavailable
forms arising in aqueous speciations of binary and ternary systems.
In an effort to understand the ternary vanadium–H<sub>2</sub>O<sub>2</sub>–ligand interactions relevant to that metal ion’s
biological role, synthetic efforts were launched involving the physiological
ligands betaine (Me<sub>3</sub>N<sup>+</sup>CH<sub>2</sub>CO<sub>2</sub><sup>–</sup>) and H<sub>2</sub>O<sub>2</sub>. In a pH-specific
fashion, V<sub>2</sub>O<sub>5</sub>, betaine, and H<sub>2</sub>O<sub>2</sub> reacted and afforded three new, unusual, and unique compounds,
consistent with the molecular formulation K<sub>2</sub>[V<sub>2</sub>O<sub>2</sub>(O<sub>2</sub>)<sub>4</sub>{(CH<sub>3</sub>)<sub>3</sub>ÂNCH<sub>2</sub>CO<sub>2</sub>)}]·H<sub>2</sub>O (<b>1</b>), (NH<sub>4</sub>)<sub>2</sub>[V<sub>2</sub>O<sub>2</sub>(O<sub>2</sub>)<sub>4</sub>{(CH<sub>3</sub>)<sub>3</sub>ÂNCH<sub>2</sub>CO<sub>2</sub>)}]·0.75H<sub>2</sub>O (<b>2</b>),
and {Na<sub>2</sub>[V<sub>2</sub>O<sub>2</sub>(O<sub>2</sub>)<sub>4</sub>{(CH<sub>3</sub>)<sub>3</sub>ÂNCH<sub>2</sub>CO<sub>2</sub>)}<sub>2</sub>]}<sub><i>n</i></sub>·4<i>n</i>H<sub>2</sub>O (<b>3</b>). All complexes <b>1</b>–<b>3</b> were characterized by elemental analysis; UV/visible, FT-IR,
Raman, and NMR spectroscopy in solution and the solid state; cyclic
voltammetry; TGA-DTG; and X-ray crystallography. The structures of <b>1</b> and <b>2</b> reveal the presence of unusual ternary
dinuclear vanadium–tetraperoxido–betaine complexes containing
[(V<sup>V</sup>î—»O)Â(O<sub>2</sub>)<sub>2</sub>] units interacting
through long V–O bonds. The two VÂ(V) ions are bridged through
the oxygen terminal of one of the peroxide groups bound to the vanadium
centers. The betaine ligand binds only one of the two VÂ(V) ions. In
the case of the third complex <b>3</b>, the two vanadium centers
are not immediate neighbors, with Na<sup>+</sup> ions (a) acting as
efficient oxygen anchors and through Na–O bonds holding the
two vanadium ions in place and (b) providing for oxygen-containing
ligand binding leading to a polymeric lattice. In <b>1</b> and <b>3</b>, interesting 2D (honeycomb) and 1D (zigzag chains) topologies
of potassium nine-coordinate polyhedra (<b>1</b>) and sodium
octahedra (<b>3</b>), respectively, form. The collective physicochemical
properties of the three ternary species <b>1</b>–<b>3</b> project the chemical role of the low molecular mass biosubstrate
betaine in binding VÂ(V)–diperoxido units, thereby stabilizing
a dinuclear VÂ(V)–tetraperoxido dianion. Structural comparisons
of the anions in <b>1</b>–<b>3</b> with other known
dinuclear VÂ(V)–tetraperoxido binary anionic species provide
insight into the chemical reactivity of VÂ(V)–diperoxido systems
and their potential link to cellular events such as insulin mimesis
and anitumorigenicity modulated by the presence of betaine