Mechanochemical Reaction of Polymeric Oxovanadium(IV) Complexes with Schiff Base Ligands Derived from 5-Nitrosalicylaldehyde and Diamines

Tsuchimoto, Masanobu; Hoshina, Gakuse; Yoshioka, Naoki; Inoue, Hidenari; Nakajima, Kiyohiko; Kamishima, Mayumi; Kojima, Masayasu; Ohba, Shigeru

doi:10.1006/jssc.2000.8710

Cited by 43 publications

(22 citation statements)

References 12 publications

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“…However, related mechanical changes in color, rather than luminescence, have been observed by the research groups of Kojima, Tsuchimoto, and Ohba for a number of vanadyl complexes of Schiff bases. [16][17][18][19] (Figure 2 A) have been obtained by crystallization from methanol, and contain isolated complexes that lack the V=O···V=O··· interactions seen in the orange form.…”

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confidence: 99%

Dynamic Crystals: Visually Detected Mechanochemical Changes in the Luminescence of Gold and Other Transition‐Metal Complexes

2009

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Back to the grindstone: Certain crystalline complexes of gold, platinum, and vanadium undergo dramatic changes in their luminescence or their color upon grinding. The picture shows the transformation of colorless crystals of [(F(5)C(6)Au)(2)(mu-1,4-CN(2)C(6)H(4))] powder from a blue-emitting form (lambda(max) = 415 nm) to a yellow/green-emitting form (lambda(max) = 533 nm) on grinding with a pestle. The process is reversible.

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confidence: 99%

Dynamic Crystals: Visually Detected Mechanochemical Changes in the Luminescence of Gold and Other Transition‐Metal Complexes

2009

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“…ese spectra are similar to other �vecoordinate oxovanadium(IV) complexes involving nitrogen donor atoms. ese spectral bands are interpreted according to an energy level scheme reported by Tsuchimoto et al [25] for distorted, �ve-coordinate square pyramidal oxovanadium(IV) complexes [26,27]. Accordingly, the observed bands can be assigned to 2 B 2 → 2 E, 2 B 2 → 2 B 1 and 2 B 2 → 2 A 1 transitions, respectively.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Oxovanadium(IV) Complexes with Tetraaza Coordinating Ligands

Singh

Yadav

Yadava

et al. 2012

Journal of Chemistry

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Oxovanadium(IV) complexes of the type [VO(mac)]SO4(where mac = tetraaza macrocyclic ligands derived by condensation of thenil with 1,4-diaminobenzene or 3,4-diaminopyridine and their reaction withβ-diketones) have been prepared using vanadyl ion as kinetic template. The prepared macrocyclic complexes were characterized by elemental analyses, molar conductance, magnetic moments, and infrared, electronic, and electron spin resonance data. From the spectroscopic studies, five-coordinate square-pyramidal geometry for the VO2+complexes have been proposed wherein derived ligands act as tetradentate chelating agents.

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“…a 1 transitions respectively attesting a square pyramidal geometry of the vanadium(IV) complex in zeolite [24][25][26]. The intra-ligand transition and LMCT bands of zeolite encapsulated complex were red shifted with respect to VO(opbmzl) 2 owing to the influence of zeolite matrix on vanadium complex.…”

Section: Spectroscopic Characterizationmentioning

confidence: 99%

Zeolite-Y encapsulated VO[2-(2′-hydroxyphenyl)benzimidazole] complex: investigation of its catalytic activity towards oxidation of organic substrates

2016

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Zeolite-Y encapsulated VO(IV)2-(2 0 -hydroxyphenyl)benzimidazole (ohpbmzl) was synthesized by flexible ligand approach and characterized using various physico-chemical techniques such as elemental analysis, XRD, inductively coupled plasma-atomic emission, fourier transform infrared spectroscopy, UV-vis-diffuse reflectance and electron paramagnetic resonance spectroscopy, thermogravimetric analysis, BET surface area and cyclic voltammetry (CV). Based on the results a square pyramidal structure was suggested for the encapsulated complex. Shift in UV absorbance to higher wavelength and variations in the redox potential values compared to the nonencapsulated complex in CV confirmed the successful encapsulation of the complex in the zeolite matrix. The catalytic efficacy was investigated towards oxidation of phenol, styrene, cyclohexane and ethyl benzene in acetonitrile using H 2 O 2 as oxidant. Influence of reaction parameters like catalyst and substrate concentration, substrate/H 2 O 2 molar ratio, and temperature were investigated to optimize the reaction conditions for maximum substrate conversion and selectivity towards desired products using the encapsulated complex. The catalytic activity was compared with vanadyl exchanged zeolite-Y (VO-Y) and non-encapsulated complex. The encapsulated complex retained its stability up to 3 runs as confirmed by recycling studies. Mechanistic pathways were proposed for all the probe reactions.

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Mechanochemical Reaction of Polymeric Oxovanadium(IV) Complexes with Schiff Base Ligands Derived from 5-Nitrosalicylaldehyde and Diamines

Cited by 43 publications

References 12 publications

Dynamic Crystals: Visually Detected Mechanochemical Changes in the Luminescence of Gold and Other Transition‐Metal Complexes

Dynamic Crystals: Visually Detected Mechanochemical Changes in the Luminescence of Gold and Other Transition‐Metal Complexes

Synthesis of Oxovanadium(IV) Complexes with Tetraaza Coordinating Ligands

Zeolite-Y encapsulated VO[2-(2′-hydroxyphenyl)benzimidazole] complex: investigation of its catalytic activity towards oxidation of organic substrates

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