Spectroscopic studies on the uranyl-schiff base solid complex (N,N'-p-phenylenebis(salicylideneiminato)UO2)

Nour, E. M.; Alnaimi, I. S.; Alem, N.A.

doi:10.1016/0022-3697(92)90028-c

Cited by 18 publications

(13 citation statements)

References 14 publications

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“…The Raman shift of the symmetric uranyl stretch for complex 3-t Bu was observed at 789 cm −1 (λ ex = 1064 cm −1 ; Figure S22). Similar symmetric and asymmetric stretching frequencies for uranyl complexes are observed in Schiff base ligand systems, including UO 2 (sal-p-phdn)(H 2 O) (υ asym = 915; υ sym = 830 cm −1 ) (sal-p-phdn = N,N′-p-phenylene-bis(salicylideneiminato)) 41 and UO 2 (NCS) 2 (Me-N-Sal) 3 Due to the bright blue colors of 3 and 3-t Bu, investigation by electronic absorption spectroscopy was also performed. Both complexes exhibit three strong absorbances in the UV−vis region ( Figure 5).…”

Section: Journal Of the American Chemical Societymentioning

confidence: 53%

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Synthesis, Characterization, and Stoichiometric U–O Bond Scission in Uranyl Species Supported by Pyridine(diimine) Ligand Radicals

et al. 2015

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Two uranium(VI) uranyl compounds, Cp*UO2((Mes)PDI(Me)) (3) and Cp*UO2((t)Bu-(Mes)PDI(Me)) (3-(t)Bu) (Cp* = 1,2,3,4,5-pentamethylcyclopentadienide; (Mes)PDI(Me) = 2,6-((Mes)N=CMe)2C5H3N; (t)Bu-(Mes)PDI(Me) = 2,6-((Mes)N=CMe)2-p-C(CH3)3C5H2N; Mes = 2,4,6-trimethylphenyl), have been synthesized by addition of N-methylmorpholine N-oxide to trianionic pyridine(diimine) uranium(IV) precursors, Cp*U((Mes)PDI(Me))(THF) (1), Cp*U((Mes)PDI(Me))(HMPA) (1-HMPA), and Cp*U((t)Bu-(Mes)PDI(Me))(THF) (1-(t)Bu). These uranyl complexes contain singly reduced pyridine(diimine) ligands suggesting formation occurs via cooperative ligand/metal oxidation. Treating 3 or 3-(t)Bu with stoichiometric equivalents of Me3SiI results in stepwise oxo silylation to form (Me3SiO)2UI2((Mes)PDI(Me)) (5) or (Me3SiO)UI2((t)Bu-(Mes)PDI(Me)) (5-(t)Bu), respectively. Additional equivalents result in full uranium-oxo bond scission and formation of UI4(1,4-dioxane)2 with extrusion of hexamethyldisiloxane. The uranium complexes have been characterized via multinuclear NMR, vibrational, and electronic absorption spectroscopies and, in some cases, X-ray crystallography.

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Section: Journal Of the American Chemical Societymentioning

confidence: 53%

“…Anal. Calcd for C 41 (4). A 20 mL scintillation vial was charged with Cp*UO 2 ( Mes PDI Me ) (3) (0.100 g, 0.125 mmol) and 3 mL of toluene and cooled to −35°C.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Synthesis, Characterization, and Stoichiometric U–O Bond Scission in Uranyl Species Supported by Pyridine(diimine) Ligand Radicals

et al. 2015

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“…These changes of the IR spectra suggest that L 1 , L 2 , L 3 are coordinated to the Zr(IV) via two nitrogen atoms of amino (N‐H) and hydrazono (C=N) groups. The ν(O‐H) vibration of the water molecules in the prepared complexes were found at 3397–3402 cm ‐1 also, the ν(C=O) was found at 1599–1615 cm −1 .…”

Section: Resultsmentioning

confidence: 88%

“…The infra‐red spectra for the three free ligands (L 1 , L 2 , L 3 ) and their metal complexes were showed in Figure S1 and listed in Table . From these spectra the site and kind of donation that may be involved in chelation could be identified . At 3413 and 1406 cm −1 two bands attributed to the stretching vibration of ν(N‐H) amino and for ν(C=N) hydrazono groups.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and cytotoxic evaluation of some substituted pyrazole zirconium (IV) complexes and their biological assay

El‐Shwiniy

Shehab

Mohamed

et al. 2018

Applied Organom Chemis

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Pyrazole and their derivatives are found to have intense biological efficiency. In the present work some substituted pyrazole derivatives were synthesized and used as ligands (4‐[2‐vinylthiophene]‐3‐methyl pyrozolin‐5(4H) ‐ one (L1), 4‐[4‐chloro benzylidine]‐3‐methyl pyrozolin‐5(4H) ‐ one (L2) and 4‐[4‐dimethylnitro benzylidine]‐3‐methylpyrozolin‐5(4H) ‐ one (L3)) to prepare the zirconium (IV) complexes. The synthesized ligands and their complexes were obtained as colored powdered materials and were characterized using magnetic measurements, melting point, molar conductance, infrared, electronic, 1HNMR, mass spectra and thermogravimetric analyses. All of the tested compounds showed good microbial activity against pathogenic microorganisms. The tested compounds exhibited considerable antitumor activity and cytotoxic specificity towards human colon carcinoma cell line (HCT‐116).

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“…Elemental analysis and physico-analytical data for ibuprofen and its metal complexes. [44][45][46][47][48]. The four vibrations of the uranyl unit, UO 2 , under C s symmetry are 3 A 0 and A 00 , s (U¼O), A 0 ; as (U¼O), A 0 ; (UO 2 ), A 0 and (UO 2 ), A 00 .…”

Section: Ir Data and Bondingmentioning

confidence: 98%

Spectroscopic, thermal analysis, and antimicrobial evaluation of new Y(III), Zr(IV), and U(VI) ibuprofen complexes

Zordok

Sadeek

El‐Shwiniy

2012

Journal of Coordination Chemistry

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New complexes of Y(III), Zr(IV), and U(VI) with the anti-inflammatory drug ibuprofen (IBU) have been synthesized and characterized by elemental analysis, spectroscopic techniques (UVVisible, IR, and 1 H NMR), magnetic moment determination, conductance measurements, and thermal analyses (thermogravimetric and differential thermogravimetric). The anti-inflammatory drug acts as bidentate chelate bound to metal ions through the deprotonated carboxylate. The calculated bond length and force constant, F(U¼O), in the uranyl complex are 1.815 Å and 671.69 Nm À1 , respectively. The metal-ligand binding of the Zr(IV) and Y(III) complexes is predicted using density functional theory at the B3LYP-CEP-31G level of theory and total energy, dipole moment estimation of different Zr(IV) and Y(III) ibuprofen structures. The antibacterial activity of the ligand, metal salts, and metal complexes have been tested, showing that the complexes are significant against all six bacterial species compared with IBU and metal salts.

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Spectroscopic studies on the uranyl-schiff base solid complex (N,N'-p-phenylenebis(salicylideneiminato)UO2)

Cited by 18 publications

References 14 publications

Synthesis, Characterization, and Stoichiometric U–O Bond Scission in Uranyl Species Supported by Pyridine(diimine) Ligand Radicals

Synthesis, Characterization, and Stoichiometric U–O Bond Scission in Uranyl Species Supported by Pyridine(diimine) Ligand Radicals

Synthesis and cytotoxic evaluation of some substituted pyrazole zirconium (IV) complexes and their biological assay

Spectroscopic, thermal analysis, and antimicrobial evaluation of new Y(III), Zr(IV), and U(VI) ibuprofen complexes

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