Monooxovanadium(V) mixed ligand complexes of schiff bases and catecholates : Synthesis, spectral and electrochemical characterization

Asgedom, Gebray; Sreedhara, Alavattam; Rao, Chebrolu P.; Kolehmainen, Erkki

doi:10.1016/0277-5387(96)00123-4

Cited by 27 publications

(11 citation statements)

References 20 publications

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“…Coordinated benzhydroxamate and catecholate induce strong charge transfer to the metal centre in complexes with high‐valent metal ions. Thus, a strong band at λ = 565 nm for 10 and 11 , and two intense bands at λ ≈︁ 500 and 766 nm for 8 and 9 were assigned to LMCT originating from lone‐pair p orbitals on the hydroxamato49 and catecholato oxygen atoms,50 respectively, into an empty d orbital of the vanadium ion. As vanadium(V) complexes are d 0 systems, d−d bands were not expected in these complexes.…”

Section: Resultsmentioning

confidence: 99%

Vanadium(IV/V) Complexes Containing [VO]2+, [VO]3+, [VO2]+ and [VO(O2)]+ Cores with Ligands Derived from 2-Acetylpyridine andS-Benzyl- orS-Methyldithiocarbazate

Maurya

Khurana

Zhang

et al. 2002

Eur. J. Inorg. Chem.

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Vanadium complexes containing [VO] 2+ , [VO] 3+ , [VO 2 ] + and [VO(O 2 )] + cores with ligands (LH) derived from 2-acetylpyridine and S-benzyldithiocarbazate (Hacpy-sbdt, I) or Smethyldithiocarbazate (Hacpy-smdt, II) are introduced. The dioxovanadium(V) complexes [VO 2 L] [HL = I (2), II (5)] were isolated from the reaction between LH and [VO(acac) 2 ] in the presence of air and KOH in dry methanol. Treatment of II with aerated [VO(acac) 2 ] in wet methanol yielded the malonato complex [VO(acpy-smdt)mal] (6), with the malonate ligand originating from acetylacetonate. Under anaerobic reaction conditions, LH replaced one of the acac(1−) ligands to yield the oxovanadium(IV) complexes [VO(acac)L] [HL = I (1), II (4)]. Treatment of these complexes with H 2 O 2 , catechol or benzhydroxamic acid gave rise to oxo(peroxo)vanadium complexes [VO(O 2 )L] [HL = I (3), II (7)], catecholato com-

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Section: Resultsmentioning

confidence: 99%

Vanadium(IV/V) Complexes Containing [VO]2+, [VO]3+, [VO2]+ and [VO(O2)]+ Cores with Ligands Derived from 2-Acetylpyridine andS-Benzyl- orS-Methyldithiocarbazate

Maurya

Khurana

Zhang

et al. 2002

Eur. J. Inorg. Chem.

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“…VO(acazb)(quinol) [153], where acazb is the dianion of 2-carboxy-2 -hydroxy-5 -methylazobenzene, was isolated and used to electrogenerate in DCM solution the mixed-valence couple [V 2 O 2 (acazb) 2 Mixed ligand, monooxidovanadium(V) complexes of Schiff bases with 1,2-benzenediol (catH 2 ), 4-tert-butyl-1,2-benzenediol ( t BucatH 2 ) or 1,2,3-benzenetriol (pygalH 2 ) have been synthesized [156]. Electrochemistry of these complexes showed one reversible V(V) → V(IV) couple and another irreversible V(IV) → V(III) response (Table 5, entries 27-38).…”

Section: Oxido-and Dioxido-vanadium(v) Speciesmentioning

confidence: 99%

A journey into the electrochemistry of vanadium compounds

Galloni

Conte

2015

Coordination Chemistry Reviews

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“…59,61,72 Other systems have also been documented where decomposition of the complexes results in new vanadium(V) species. 71,73,74 These literature precedents support the possibility that the observed deviations between the solid-state and the solution chemical shifts can arise because of reactions taking place in solution.…”

Section: Discussionmentioning

confidence: 86%

“…6,[59][60][61][62][63][64] Part of the problem is the limited solubility of vanadium(V)-o-dioxolene complexes in water because of their hydrophobic ligands. [65][66][67][68][69] Many vanadium complexes are known to hydrolyze or to undergo redox reactions in aqueous solutions 62,70,71 or to undergo intramolecular ligand exchange processes. 59,61,72 Other systems have also been documented where decomposition of the complexes results in new vanadium(V) species.…”

Section: Discussionmentioning

confidence: 99%

Effect of ancillary ligand on electronic structure as probed by 51V solid-state NMR spectroscopy for vanadium–o-dioxolene complexes

et al. 2013

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A series of vanadium(V) complexes with o-dioxolene (catecholato) ligands and an ancillary ligand, (N-(salicylideneaminato)ethylenediamine) (hensal), were investigated using 51V solid-state magic angle spinning NMR spectroscopy (51V MAS NMR) to assess the local environment of the vanadium(V). The solid-state 51V NMR parameters of vanadium(V) complexes with a related potentially tetradentate ancillary ligand (N-salicylidene-N′-(2-hydroxyethyl)ethylenediamine) (h2shed) were previously shown to be associated with the size of the HOMO-LUMO gap in the complex, and as such provide insights on the interaction between metal ion and ligand (P. B. Chatterjee, et al., Inorg. Chem 50 (2011) 9794). Our results show that the modification of the ancillary ligand does not impact the observed trend between complexes ranging from catechols with electron rich to electron poor substituents. However, the ancillary ligand does impact the size of the HOMO-LUMO separation in the parent complex and thus the solid-state vanadium NMR chemical shift of the unsubstituted vanadium complex. For these complexes significant changes observed in the isotropic shifts and more modest changes detected in the CQ reflect the electronic changes in the complex as the catechol is varied. However, no obvious trend was observed in the chemical shift anisotropies (δσ and ησ) with the variation in the catechol. The electronic changes in the coordination environment of the vanadium can be described using solid-state 51V NMR spectroscopy.

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Monooxovanadium(V) mixed ligand complexes of schiff bases and catecholates : Synthesis, spectral and electrochemical characterization

Cited by 27 publications

References 20 publications

Vanadium(IV/V) Complexes Containing [VO]2+, [VO]3+, [VO2]+ and [VO(O2)]+ Cores with Ligands Derived from 2-Acetylpyridine andS-Benzyl- orS-Methyldithiocarbazate

Vanadium(IV/V) Complexes Containing [VO]2+, [VO]3+, [VO2]+ and [VO(O2)]+ Cores with Ligands Derived from 2-Acetylpyridine andS-Benzyl- orS-Methyldithiocarbazate

A journey into the electrochemistry of vanadium compounds

Effect of ancillary ligand on electronic structure as probed by 51V solid-state NMR spectroscopy for vanadium–o-dioxolene complexes

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