Ruthenium(II) chalconate complexes: Synthesis, characterization, catalytic, and biological studies

Muthukumar, M.; Viswanathamurthi, Periasamy

doi:10.1016/j.saa.2009.06.041

Cited by 17 publications

(6 citation statements)

References 45 publications

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“…This has been further confirmed by the disappearance of the broad O-H band around 3372-3470 cm -1 in all the complexes due to the binding of phenolic -OH group to ruthenium after deprotonation [39]. The strong absorption band around 1932-1948 cm -1 was due to the terminally coordinated carbonyl group.…”

Section: Spectroscopic Studiessupporting

confidence: 59%

Ruthenium(II) 8-quinolinolates: Synthesis, characterization, crystal structure and catalysis in the synthesis of 2-oxazolines

Anitha

Manikandan

Prakash

et al. 2015

Journal of Organometallic Chemistry

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New octahedral ruthenium(II) complexes (1-4) have been synthesized from the reaction of ruthenium(II) precursors [RuHCl(CO)(EPh 3 ) 3 ] (E = P or As) with the bidentate Schiff base ligands, 2-((2,6-dimethylphenylimino)methyl)quinolin-8-ol (L 1 ) and 2-((2,6-diisopropylphenylimino)methyl)quinolin-8-ol (L 2 ) in ethanol. These complexes have been characterized by elemental analyses, IR, UV-Vis, 1 H, 13 C and 31 P NMR and ESI-Mass spectroscopy. The molecular structure of the complex [RuCl(CO)(PPh 3 ) 2 (L 2 )] (2) was determined by single-crystal X-ray diffraction, which reveals a distorted octahedral geometry around ruthenium(II) ion. The catalytic activity of the new complexes was evaluated for the condensation of nitriles with ethanolamine under solvent free conditions. The processes were operative with aromatic and heteroaromatic nitriles and tolerated several substitutional groups.The studies on the effect of substitution over ligands, coligands, reaction time, temperature and catalyst loading were carried out in order to find the best catalyst in this series of complexes and favorable reaction conditions. A probable mechanism for the catalytic condensation of nitrile has also been proposed. The catalyst was recovered and recycled up to five times without significant loss of its activity.

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Section: Spectroscopic Studiessupporting

confidence: 59%

Ruthenium(II) 8-quinolinolates: Synthesis, characterization, crystal structure and catalysis in the synthesis of 2-oxazolines

Anitha

Manikandan

Prakash

et al. 2015

Journal of Organometallic Chemistry

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“…A strong band obtained around 1320–1300 cm −1 in the spectra of free ligands was assigned to phenolic CO stretching which had been shifted to a higher frequency (1390–1360 cm −1 ) in the complexes, showing that the other coordination is through the phenolic oxygen atom . This has been further confirmed by the disappearance of the broad ν OH band around 3388–3370 cm −1 in all complexes due to binding of the phenolic OH group with ruthenium metal via deprotonation . The medium‐intensity band at 870 cm −1 and a shoulder at 3210–3260 cm −1 was due to the presence of CS and NH groups in the ligands, which disappeared in the complexes, and a new band appeared for CS around 750–760 cm −1 due to enolization of the ligand, followed by deprotonation prior to the coordination of the thiolate sulfur .…”

Section: Resultsmentioning

confidence: 56%

“…[69] This has been further confirmed by the disappearance of the broad ν OH band around 3388-3370 cm À1 in all complexes due to binding of the phenolic -OH group with ruthenium metal via deprotonation. [70] The medium-intensity band at 870 cm À1 and a shoulder at 3210-3260 cm À1 was due to the presence of C¼S and NH groups in the ligands, which disappeared in the complexes, and a new band appeared for C-S around 750-760 cm À1 due to enolization of the ligand, followed by deprotonation prior to the coordination of the thiolate sulfur. [71] The strong absorption band around 1981-1938 cm À1 was due to the CO stretching of the terminally coordinated carbonyl group.…”

Section: Infrared Spectroscopic Analysismentioning

confidence: 99%

Ruthenium(II) complexes of hybrid 8‐hydroxyquinoline–thiosemicarbazone ligands: synthesis, characterization and catalytic applications

Nirmala

Manikandan

Prakash

et al. 2013

Applied Organom Chemis

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A series of new hexa-coordinated ruthenium(II) hydroxyquinoline-thiosemicarbazone complexes of the type [Ru(CO)(EPh 3 )(B) (L)] (E = P or As; B = PPh 3 , AsPh 3 or Py; L = hydroxyquinoline-thiosemicarbazone) were synthesized by reacting ruthenium precursor complexes [RuHCl(CO)(EPh 3 ) 2 (B)] (E = P or As; B = PPh 3 , AsPh 3 or Py) with hydroxyquinoline-thiosemicarbazone ligands in ethanol. The new complexes were characterized by analytical and spectroscopic (FT-IR, UV-visible, NMR ( 1 H, 13 C and 31 P) and fast atom bombardment (FAB)-mass spectrometric methods. Based on the spectral results, an octahedral geometry was assigned for all the complexes. The new complexes showed good catalytic activity for the conversion of aldehydes to amides in the presence of hydroxylamine hydrochloride-sodium bicarbonate and for the oxidation of alkanes into their corresponding alcohols and ketones in the presence of m-chloroperbenzoic acid. The complexes also catalyzed the N-alkylation of benzylamine in the presence of KOtBu in alcohol medium.

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“…Octahedral geometries were tentatively proposed for all complexes. 95,96 The antifungal activities of the Ru(II) chalconato complexes against A. niger and Mucor Sp. strains were greater than the parent ligands alone, but still did not reach the efficacy of the standard drug, Bavistin®.…”

Section: Polypyridine Based Metal Complexesmentioning

confidence: 99%

Recent developments of metal-based compounds against fungal pathogens

et al. 2021

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Ruthenium(II) chalconate complexes: Synthesis, characterization, catalytic, and biological studies

Cited by 17 publications

References 45 publications

Ruthenium(II) 8-quinolinolates: Synthesis, characterization, crystal structure and catalysis in the synthesis of 2-oxazolines

Ruthenium(II) 8-quinolinolates: Synthesis, characterization, crystal structure and catalysis in the synthesis of 2-oxazolines

Ruthenium(II) complexes of hybrid 8‐hydroxyquinoline–thiosemicarbazone ligands: synthesis, characterization and catalytic applications

Recent developments of metal-based compounds against fungal pathogens

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