Synthesis and characterization of 8-quinolinolato vanadium(IV) complexes

Kentaro Takano, Yukinari Sunatsuki, Masaaki Kojima, Isamu Kinoshita, Takashi Shibahara

Research output: Contribution to journalArticle

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Abstract

Reaction of vanadium(III) chloride with 8-quinolinol (Hqn) gave a mononuclear vanadium(IV) complex, [VOCl2(H2O)2] 1) · 2H2qn · 2Cl · CH3CN, and three dinuclear vanadium(IV) complexes: [V2O2Cl2(qn)2(H2O )2] (2) · Hqn, [V2O2Cl2(qn)2(C3H 7OH)2] (3), and [V2O2Cl2(qn)2(C4H 9OH)2] (4). Reaction of vanadium(III) chloride with 5-chloro-8-quinolinol (HClqn) gave four dinuclear vanadium(IV) complexes: [V2O2Cl2(Clqn)2(H2 O)2] (5) · 2HClqn, [V2O2Cl2(Clqn)2(C3 H7OH)2] (6), [V2O2Cl2(Clqn)2(C6 H5CH2OH)2] (7), and [V2O2Cl2(Clqn)2(C4 H9OH)2] (8) · 2C4H9OH. Reaction of vanadium(III) chloride with 5-fluoro-8-quinolinol (HFqn) gave two dinuclear vanadium(IV) complexes: [V2O2Cl2(Fqn)2(H2 O)2] (9) · HFqn · 2H2O and V2O2Cl2(Fqn)2(C3H 7OH)2] (10). X-ray structures of 1 · 2H2qn · 2Cl · CH3CN, 3, 4, 6, 7, 8 · 2 t-BuOH, and 10 have been determined. As to the mononuclear species 1 · 2H2qn · 2Cl · CH3CN, coordination of Hqn to vanadium does not occur, but protonation to Hqn occurs to give H2qn+, which links 1's through hydrogen bonding, while each of the dinuclear species has a terminal and a bridging qn (or Clqn, Fqn) ligand, giving rise to a (V-O)2 ring. Magnetic measurements of 3, 4, 6, 7, and 10 in solid form show very weak antiferromagnetic behavior, and the effective magnetic moments are close to spin only value (2.44) of d1-d1 system, while ESR of 3 in THF shows dissociation to monomeric species. Change from mononuclear, 1, to dinuclear, 2, species was followed by the change of electronic spectrum.

Original languageEnglish
Pages (from-to)3201-3207
Number of pages7
JournalInorganica Chimica Acta
Volume362
Issue number9
DOIs
Publication statusPublished - Jul 1 2009

Fingerprint

Vanadium
vanadium
synthesis
Oxyquinoline
Chlorides
chlorides
Protonation
Magnetic variables measurement
Magnetic moments
electronic spectra
magnetic measurement
Paramagnetic resonance
Hydrogen bonds
magnetic moments

Keywords

  • 8-Quinolinol
  • Electronic spectra
  • ESR
  • Magnetic measurements
  • Vanadium complexes
  • X-ray structures

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

Synthesis and characterization of 8-quinolinolato vanadium(IV) complexes. / Takano, Kentaro; Sunatsuki, Yukinari; Kojima, Masaaki; Kinoshita, Isamu; Shibahara, Takashi.

In: Inorganica Chimica Acta, Vol. 362, No. 9, 01.07.2009, p. 3201-3207.

Research output: Contribution to journalArticle

Takano, Kentaro ; Sunatsuki, Yukinari ; Kojima, Masaaki ; Kinoshita, Isamu ; Shibahara, Takashi. / Synthesis and characterization of 8-quinolinolato vanadium(IV) complexes. In: Inorganica Chimica Acta. 2009 ; Vol. 362, No. 9. pp. 3201-3207.
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abstract = "Reaction of vanadium(III) chloride with 8-quinolinol (Hqn) gave a mononuclear vanadium(IV) complex, [VOCl2(H2O)2] 1) · 2H2qn · 2Cl · CH3CN, and three dinuclear vanadium(IV) complexes: [V2O2Cl2(qn)2(H2O )2] (2) · Hqn, [V2O2Cl2(qn)2(C3H 7OH)2] (3), and [V2O2Cl2(qn)2(C4H 9OH)2] (4). Reaction of vanadium(III) chloride with 5-chloro-8-quinolinol (HClqn) gave four dinuclear vanadium(IV) complexes: [V2O2Cl2(Clqn)2(H2 O)2] (5) · 2HClqn, [V2O2Cl2(Clqn)2(C3 H7OH)2] (6), [V2O2Cl2(Clqn)2(C6 H5CH2OH)2] (7), and [V2O2Cl2(Clqn)2(C4 H9OH)2] (8) · 2C4H9OH. Reaction of vanadium(III) chloride with 5-fluoro-8-quinolinol (HFqn) gave two dinuclear vanadium(IV) complexes: [V2O2Cl2(Fqn)2(H2 O)2] (9) · HFqn · 2H2O and V2O2Cl2(Fqn)2(C3H 7OH)2] (10). X-ray structures of 1 · 2H2qn · 2Cl · CH3CN, 3, 4, 6, 7, 8 · 2 t-BuOH, and 10 have been determined. As to the mononuclear species 1 · 2H2qn · 2Cl · CH3CN, coordination of Hqn to vanadium does not occur, but protonation to Hqn occurs to give H2qn+, which links 1's through hydrogen bonding, while each of the dinuclear species has a terminal and a bridging qn (or Clqn, Fqn) ligand, giving rise to a (V-O)2 ring. Magnetic measurements of 3, 4, 6, 7, and 10 in solid form show very weak antiferromagnetic behavior, and the effective magnetic moments are close to spin only value (2.44) of d1-d1 system, while ESR of 3 in THF shows dissociation to monomeric species. Change from mononuclear, 1, to dinuclear, 2, species was followed by the change of electronic spectrum.",
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AU - Takano, Kentaro

AU - Sunatsuki, Yukinari

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AU - Kinoshita, Isamu

AU - Shibahara, Takashi

PY - 2009/7/1

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N2 - Reaction of vanadium(III) chloride with 8-quinolinol (Hqn) gave a mononuclear vanadium(IV) complex, [VOCl2(H2O)2] 1) · 2H2qn · 2Cl · CH3CN, and three dinuclear vanadium(IV) complexes: [V2O2Cl2(qn)2(H2O )2] (2) · Hqn, [V2O2Cl2(qn)2(C3H 7OH)2] (3), and [V2O2Cl2(qn)2(C4H 9OH)2] (4). Reaction of vanadium(III) chloride with 5-chloro-8-quinolinol (HClqn) gave four dinuclear vanadium(IV) complexes: [V2O2Cl2(Clqn)2(H2 O)2] (5) · 2HClqn, [V2O2Cl2(Clqn)2(C3 H7OH)2] (6), [V2O2Cl2(Clqn)2(C6 H5CH2OH)2] (7), and [V2O2Cl2(Clqn)2(C4 H9OH)2] (8) · 2C4H9OH. Reaction of vanadium(III) chloride with 5-fluoro-8-quinolinol (HFqn) gave two dinuclear vanadium(IV) complexes: [V2O2Cl2(Fqn)2(H2 O)2] (9) · HFqn · 2H2O and V2O2Cl2(Fqn)2(C3H 7OH)2] (10). X-ray structures of 1 · 2H2qn · 2Cl · CH3CN, 3, 4, 6, 7, 8 · 2 t-BuOH, and 10 have been determined. As to the mononuclear species 1 · 2H2qn · 2Cl · CH3CN, coordination of Hqn to vanadium does not occur, but protonation to Hqn occurs to give H2qn+, which links 1's through hydrogen bonding, while each of the dinuclear species has a terminal and a bridging qn (or Clqn, Fqn) ligand, giving rise to a (V-O)2 ring. Magnetic measurements of 3, 4, 6, 7, and 10 in solid form show very weak antiferromagnetic behavior, and the effective magnetic moments are close to spin only value (2.44) of d1-d1 system, while ESR of 3 in THF shows dissociation to monomeric species. Change from mononuclear, 1, to dinuclear, 2, species was followed by the change of electronic spectrum.

AB - Reaction of vanadium(III) chloride with 8-quinolinol (Hqn) gave a mononuclear vanadium(IV) complex, [VOCl2(H2O)2] 1) · 2H2qn · 2Cl · CH3CN, and three dinuclear vanadium(IV) complexes: [V2O2Cl2(qn)2(H2O )2] (2) · Hqn, [V2O2Cl2(qn)2(C3H 7OH)2] (3), and [V2O2Cl2(qn)2(C4H 9OH)2] (4). Reaction of vanadium(III) chloride with 5-chloro-8-quinolinol (HClqn) gave four dinuclear vanadium(IV) complexes: [V2O2Cl2(Clqn)2(H2 O)2] (5) · 2HClqn, [V2O2Cl2(Clqn)2(C3 H7OH)2] (6), [V2O2Cl2(Clqn)2(C6 H5CH2OH)2] (7), and [V2O2Cl2(Clqn)2(C4 H9OH)2] (8) · 2C4H9OH. Reaction of vanadium(III) chloride with 5-fluoro-8-quinolinol (HFqn) gave two dinuclear vanadium(IV) complexes: [V2O2Cl2(Fqn)2(H2 O)2] (9) · HFqn · 2H2O and V2O2Cl2(Fqn)2(C3H 7OH)2] (10). X-ray structures of 1 · 2H2qn · 2Cl · CH3CN, 3, 4, 6, 7, 8 · 2 t-BuOH, and 10 have been determined. As to the mononuclear species 1 · 2H2qn · 2Cl · CH3CN, coordination of Hqn to vanadium does not occur, but protonation to Hqn occurs to give H2qn+, which links 1's through hydrogen bonding, while each of the dinuclear species has a terminal and a bridging qn (or Clqn, Fqn) ligand, giving rise to a (V-O)2 ring. Magnetic measurements of 3, 4, 6, 7, and 10 in solid form show very weak antiferromagnetic behavior, and the effective magnetic moments are close to spin only value (2.44) of d1-d1 system, while ESR of 3 in THF shows dissociation to monomeric species. Change from mononuclear, 1, to dinuclear, 2, species was followed by the change of electronic spectrum.

KW - 8-Quinolinol

KW - Electronic spectra

KW - ESR

KW - Magnetic measurements

KW - Vanadium complexes

KW - X-ray structures

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