Proton nuclear magnetic resonance studies of several polyaminocarboxylic acid complexes of vanadium(V)

Amos, Larry W.; Sawyer, Donald T.

doi:10.1021/ic50117a024

Cited by 43 publications

(22 citation statements)

References 4 publications

(7 reference statements)

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“…In this context it is important to note that the isomerization mechanism for the complexes 4 is not restricted to octahedral oxovanadium(V) complexes. In fact, such an isomerization process can also account for the solution equilibrium observed for the octahedral cis-dioxovanadium(V) complex with ethylenediamine-N,N'-diacetic acid [14,311 as well as octahedral cis-dioxomolybdenum(V1) complexes with Schiff base ligands [32] and, in addition, might also be operative for other oxometal complexes with other high-denticity ligand systems.…”

Section: Rt Rmentioning

confidence: 99%

Vanadium(V) Complexes with Flexible and Hydrolytically Stable Amine Alcohol Ligands and their isomerization in solution: Models for the interaction of Vanadium(V) with biogenic ligands

Plass

1997

Zeitschrift anorg allge chemie

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The hydrolytically stable trivalent, pentadentate amine alcohol ligands l,l-bis(2-hydroxyethyl)-4-(2-hydroxy-5-R-benzyl)-1,4-diazabutane 2 (H3hebab-R; a: R = H, b: R = OMe, c: R = B r , d: R = N O z ) react with ammonium metavanadate to form the oxovanadium(V) complexes [VO(hebab-R)] 4, which have been characterized by 'H, 13C, and 'lV NMR, vibrational (IR, Raman, and resonance Raman) and electronic spectroscopy. According the high flexibility of the ligand systems the complexes 4 possess two different possible structures in solution. These two isomers differ in the ligand arrangement: fac-4 possesses a facial configuration of the phenolate oxygen and the two amine nitrogen donors with the 0x0 group trans to the tertiary amine nitrogen atom, whereas mer-4 is characterized by a meridional configuration of the phenolate oxygen and the two amine nitrogen donors with the 0x0 group trans to the secondary amine nitrogen atom. The two isomers are related by an isomerization equilibrium proceeding via a rotation about a pseudo C3 axis of the octahedral coordination environment. This isomerization mechanism seems to be of general importance, since it can also account for the solution structures of oxovanadium(V), cis-dioxovanadium(V) and cis-dioxomolybdenum(V1) complexes of flexible high-denticity ligand systems. The electronic influence of the para substituent at the phenolate on the isomerization reaction has been investigated by 51V NMR spectrnscopy. The Inhaltsiibersicht. Die hydrolytisch stabilen dreibasigen, funfzahnigen Aminoalkohole l,l-Bis(2-hydroxyethyl)-4-(2-hy-droxy-5-R-benzyl)-l,4-diazabutan 2 (H3hebab-R; a: R = H, b: R = OMe, c: R = Br, d: R = NOz) reagieren mit Ammoniummetavanadat zu den Oxovanadium(V)-Komplexen [VO(hebab-R)] 4, deren Charakterisierung mit Hilfe von 'H-, I3C-, 'lV-NMR-, Schwingungs-(IR, Raman und Resonanz-Raman) und Elektronenanregungsspektroskopie erfolgte. Entsprechend der ausgepragten Flexibilitat der Ligandsysteme werden fur die Komplexe 4 in Losung zwei Isomere beobachtet, die sich bezuglich der Konfiguration der Donorzentren unterscheiden: f a -4 besitzt eine faciale Konfiguration des Phenolatsauerstoffatoms und der beiden

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Section: Rt Rmentioning

confidence: 99%

Vanadium(V) Complexes with Flexible and Hydrolytically Stable Amine Alcohol Ligands and their isomerization in solution: Models for the interaction of Vanadium(V) with biogenic ligands

Plass

1997

Zeitschrift anorg allge chemie

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“…The preparative studies of cobalt(III) complexes with edda and its N-alkyl-substituted analogs have shown that the a-cis isomer is more stable than the /3-cis one (Legg & Cooke, 1965;Gailey, Igi & Douglas, 1975). However, both isomers of the dioxovanadium(V) complex with edda, [VO2(edda)]-, exist in solution in nearly equal concentrations (Amos & Sawyer, 1972). Very recently, (NH4)[VOz(edda)] was reported to adopt the/3-cis configuration in the solid state (Crans, Keramidas, Mahroof-Tahir, Anderson & Miller, 1996).…”

Section: Ethylenediaminementioning

confidence: 99%

Aqua(ethylenediamine-N,N'-diacetato-O,O')oxovanadium(IV)

Kanamori¹,

Ino²,

Okamoto³

1997

Acta Crystallogr C

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“…[7][8][9][10][11][12][13] From X-ray crystallographic studies V-EDTA complexes have been characterized to show the vanadium atom in an octahedral geometry with a cis-VO 2 core. 8,9 Solution 1 H NMR studies show that the V-EDTA complex retains the solid state structure in solution, having α-cis structure.…”

Section: Introductionmentioning

confidence: 99%

“…8,9 Solution 1 H NMR studies show that the V-EDTA complex retains the solid state structure in solution, having α-cis structure. 10 In solution ethylenediaminediacetate (EDDA) ligand forms two isomers of similar stability with vanadium(V), a symmetric α-cis complex and an asymmetric β-cis complex. 10,14 In a previous paper, 15 we reported that the vanadium complex of propylenediaminetetraacetate (PDTA) ligand was determined to have α-cis structure in solid.…”

Section: Introductionmentioning

confidence: 99%

“…10 In solution ethylenediaminediacetate (EDDA) ligand forms two isomers of similar stability with vanadium(V), a symmetric α-cis complex and an asymmetric β-cis complex. 10,14 In a previous paper, 15 we reported that the vanadium complex of propylenediaminetetraacetate (PDTA) ligand was determined to have α-cis structure in solid. The anion [VO 2 PDTA] 3− has a slightly irregular octahedral geometry in which two oxo ligands are cis to each other as shown in EDTA, 7,8 and EDDA complexes.…”

Section: Introductionmentioning

confidence: 99%

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NMR Studies on the Isomerization of Vanadium(V)-Propylenediaminetetraacetate Complex in Solution

2004

Bulletin of the Korean Chemical Society

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In this paper we have determined the thermodynamic parameters for the isomerization between the α-cis and the β-cis isomers in vanadium(V)-propylenediaminetetraacetate complex in water by 51 V NMR spectroscopy. In addition, the effects of organic solvents (methanol, formamide and dimethylsulfoxide) and inorganic salts (NaCl, NaClO 4 and NH 4 Cl) on the isomerization in solution have been investigated.

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Proton nuclear magnetic resonance studies of several polyaminocarboxylic acid complexes of vanadium(V)

Cited by 43 publications

References 4 publications

Vanadium(V) Complexes with Flexible and Hydrolytically Stable Amine Alcohol Ligands and their isomerization in solution: Models for the interaction of Vanadium(V) with biogenic ligands

Vanadium(V) Complexes with Flexible and Hydrolytically Stable Amine Alcohol Ligands and their isomerization in solution: Models for the interaction of Vanadium(V) with biogenic ligands

Aqua(ethylenediamine-N,N'-diacetato-O,O')oxovanadium(IV)

NMR Studies on the Isomerization of Vanadium(V)-Propylenediaminetetraacetate Complex in Solution

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