Dioxomolybdenum(VI) complexes with 2-((2-(pyridin-2-yl)hydrazono)methyl)phenol and its derivatives

Kurapati, Sathish Kumar; Ugandhar, Uppala; Maloth, Swamy; Pal, Samudranil

doi:10.1016/j.poly.2012.05.019

Cited by 12 publications

(11 citation statements)

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“…Thus the phenolic‐OH is deprotonated and the Schiff base is monoanionic ((L n ) ‐ ) in the complex. A weak and broad band observed in the range 3308‐3234 cm ‐1 is assigned to the hydrazinic‐NH of (L n ) ‐ ,,. A sharp and strong band displayed at around 1621 cm ‐1 by all three complexes is attributed to the metal coordinated azomethine (‐HC=N‐) group of their respective ligands ,,,,.…”

Section: Resultsmentioning

confidence: 96%

“…A strong band at ∼435 nm preceded by a shoulder at ∼458 nm and two more strong bands at 360 and ∼290 nm are observed in each spectrum. The free Schiff bases (HL n ) display a very strong band within 351‐335 nm, a shoulder or band at ∼312 nm and another strong absorption at ∼240 nm . Comparison of the spectra of HL n with those of the complexes ( 1 – 3 ) indicates that the shoulder and the band at ∼458 and ∼435 nm, respectively are very likely to be due to ligand to metal charge transfer transitions ,.…”

Section: Resultsmentioning

confidence: 99%

“…The free Schiff bases (HL n ) display a very strong band within 351‐335 nm, a shoulder or band at ∼312 nm and another strong absorption at ∼240 nm . Comparison of the spectra of HL n with those of the complexes ( 1 – 3 ) indicates that the shoulder and the band at ∼458 and ∼435 nm, respectively are very likely to be due to ligand to metal charge transfer transitions ,. To find out the origins of the remaining bands and for a better overall perception of the electronic spectra, TD‐DFT calculations were carried out for 1 and 3 in DMF solution.…”

Section: Resultsmentioning

confidence: 99%

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Di‐μ‐acetato Diuranyl(VI) Complexes with N‐(2‐pyridyl)‐N′‐(5‐R‐salicylidene)hydrazines: Syntheses, Structures, Properties and Extraction Studies

et al. 2018

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Reactions of equimolar amounts of UO2(OAc)2⋅2H2O and N‐(2‐pyridyl)‐N′‐(5‐R‐salicylidene)hydrazines (HLn; n=1–3 for R = H, Me, and OMe, respectively) in methanol produced [(UO2)2(μ‐OAc)2(Ln)2] (1‐3 for n=1–3) in ∼70% yields. Elemental analysis, various spectroscopic, and electrochemical measurements were used to characterize 1‐3. X‐ray crystal structures revealed an 8‐membered U(OCO)2U ring with a chair conformation and pentagonal‐bipyramidal UN2O5 coordination spheres in each of 1‐3. The N,N,O‐donor (Ln)‐ and the two O‐atoms of the two bridging (OAc)‐ form the pentagonal plane around the U‐atom of trans‐(UO2)2+. Intermolecular H‐bonding assisted self‐assembly of the complexes lead to 1‐ and 2‐dimensional supramolecular structures. Infrared (IR) and proton nuclear magnetic resonance (1H NMR) spectra of 1‐3 are consistent with their molecular structures. The electronic spectra showed four strong absorption bands in the range 466‐288 nm. The complexes undergo two irreversible reductions near ‐0.65 and ‐0.88 V (vs. Ag/AgCl). Time‐dependent density functional theory (TD‐DFT) calculations suggest that a ligand centered transition causes the highest energy absorption band, while, the remaining three are ligand‐to‐metal charge transfer (LMCT) bands and the two successive reductions are due to U(VI)‐U(VI) → U(V)‐U(VI) → U(V)‐U(V) processes. A maximum extraction of 98% of trans‐(UO2)2+ from the aqueous layer was observed in two‐phase extraction studies.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Di‐μ‐acetato Diuranyl(VI) Complexes with N‐(2‐pyridyl)‐N′‐(5‐R‐salicylidene)hydrazines: Syntheses, Structures, Properties and Extraction Studies

et al. 2018

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“…The remaining cis bond angles span the broad range of 82.01(9)–103.51(15)°, while the trans bond angles are within a relatively narrow range of 155.51(10)–163.82(10)°. In general, the bond lengths and bond angles within the metal ion coordination spheres of 1 , 2 , 3 , 4 (Table ) lie in the range reported for cis ‐dioxomolybdenum(VI) complexes with ligands coordinating through comparable donor atoms …”

Section: Resultsmentioning

confidence: 71%

cis‐Dioxomolybdenum(VI) complexes with unsymmetric linear tetradentate ligands: syntheses, structures and bromoperoxidase activities

Kurapati

Pal

2015

Applied Organom Chemis

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C-DEPT NMR) and electrochemical measurements. The molecular structures of 1-4 have been determined using single-crystal X-ray crystallography. In each of 1-4, the ONNO-donor 6,5,5-membered fused chelate rings forming (L n ) 2À and the two mutually cis oxo groups assemble a distorted octahedral N 2 O 4 coordination sphere around the metal centre. In the crystal lattice, each of 1-4 forms a one-dimensional infinite chain structure via intermolecular N-HÁÁÁO hydrogen bonding interactions. In cyclic voltammograms, the diamagnetic complexes display an irreversible metal-centred reduction in the potential range À0.73 to À0.88 V (vs Ag/AgCl). The physicochemical data are consistent with a very similar gross molecular structure for all of 1-5. All the complexes exhibit decent bromoperoxidase activities and are also able to effectively catalyse benzoin and methyl(phenyl)sulfide oxidation reactions.

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“…They owe their popularity to the frequent occurrence of C=N bonds in natural systems, as well as the fact that varying derivatives are comparatively easy to synthesize, providing ligands of different structures. A large number of dioxomolybdenum(VI) complexes of tetradentate Schiff base ligands with the Mo(O) 2 fragment have been studied [16][17][18][19][20][21][22][23], but for Mo(VI) complexes of isonicotinohydrazone Schiff bases [24][25][26][27][28][29], the number of crystal structures are rather few [30]. Here we report the synthesis, spectroscopic characterization, and crystal structure of a new hydrazone Schiff base, (E)-N'-(3-ethoxy-2-hydroxybenzylidene)isonicotinohydrazide (H 2 L).…”

Section: Introductionmentioning

confidence: 99%

Synthesis, spectral characterization and crystal structure studies of a new hydrazone Schiff base and its dioxomolybdenum(VI) complex

Kia

Kargar

2015

Journal of Coordination Chemistry

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A new hydrazone Schiff base, (E)-N'-(3-ethoxy-2-hydroxybenzylidene)isonicotinohydrazide (H 2 L), has been prepared and characterized by elemental analyses, spectroscopic methods, and single crystal X-ray diffraction. The corresponding dioxomolybdenum(VI) complex [Mo(O) 2 (L)(CH 3 OH)] was synthesized and characterized by spectroscopic methods and by single crystal X-ray diffraction. The hydrazone ligand coordinates to Mo through the phenolate O, imine N, and enolic O. The Mo center displays a distorted octahedral geometry, with the three donors of the ligands and an oxo defining the equatorial plane, and one methanol and another oxo occupying the axial positions.

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Dioxomolybdenum(VI) complexes with 2-((2-(pyridin-2-yl)hydrazono)methyl)phenol and its derivatives

Cited by 12 publications

References 61 publications

Di‐μ‐acetato Diuranyl(VI) Complexes with N‐(2‐pyridyl)‐N′‐(5‐R‐salicylidene)hydrazines: Syntheses, Structures, Properties and Extraction Studies

Di‐μ‐acetato Diuranyl(VI) Complexes with N‐(2‐pyridyl)‐N′‐(5‐R‐salicylidene)hydrazines: Syntheses, Structures, Properties and Extraction Studies

cis‐Dioxomolybdenum(VI) complexes with unsymmetric linear tetradentate ligands: syntheses, structures and bromoperoxidase activities

Synthesis, spectral characterization and crystal structure studies of a new hydrazone Schiff base and its dioxomolybdenum(VI) complex

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