TY - JOUR
T1 - Synthesis and characterization of 8-quinolinolato vanadium(IV) complexes
AU - Takano, Kentaro
AU - Sunatsuki, Yukinari
AU - Kojima, Masaaki
AU - Kinoshita, Isamu
AU - Shibahara, Takashi
N1 - Funding Information:
We thank Miss Michiko Oki for help with the synthesis of some of the complexes. This work was partly supported by a Special Grant for Cooperative Research administered by the Japan Private School Promotion Foundation.
PY - 2009/7/1
Y1 - 2009/7/1
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 - ESR
KW - Electronic spectra
KW - Magnetic measurements
KW - Vanadium complexes
KW - X-ray structures
UR - http://www.scopus.com/inward/record.url?scp=67349109444&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=67349109444&partnerID=8YFLogxK
U2 - 10.1016/j.ica.2009.02.025
DO - 10.1016/j.ica.2009.02.025
M3 - Article
AN - SCOPUS:67349109444
SN - 0020-1693
VL - 362
SP - 3201
EP - 3207
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
IS - 9
ER -