A5030697900- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Synthesis and characterization of novel inorganic/organometallic compounds
- Organometallic Complex Synthesis and Catalysis
- Crystallography and molecular interactions
- Organoboron and organosilicon chemistry
- Coordination Chemistry and Organometallics
- Advanced Chemical Physics Studies
- Chemical Reaction Mechanisms
- Phytochemicals and Antioxidant Activities
- Inorganic Chemistry and Materials
- Organic and Inorganic Chemical Reactions
- Immunotherapy and Immune Responses
- Catalysis and Oxidation Reactions
- Mycotoxins in Agriculture and Food
- Hepatitis B Virus Studies
- Tea Polyphenols and Effects
- Chemical Reactions and Mechanisms
- Fullerene Chemistry and Applications
- Surface Chemistry and Catalysis
- Molecular Spectroscopy and Structure
- Advanced Biosensing Techniques and Applications
- Free Radicals and Antioxidants
- SARS-CoV-2 and COVID-19 Research
- Magnetism in coordination complexes
Damascus University
2007-2023
Menoufia University
2021
Veterinary Serum and Vaccine Research Institute
2014
Université Toulouse III - Paul Sabatier
1996-2007
Laboratoire de Chimie et Physique Quantiques
1996-2007
Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes
1996-2007
Centre Interuniversitaire de Recherche et d’Ingénierie des Matériaux
2006
Institut National Polytechnique de Toulouse
2006
Centre National de la Recherche Scientifique
1996-2006
École Nationale Supérieure des Ingénieurs en Arts Chimiques et Technologiques
2006
The bis(dihydrogen) complex RuH2(H2)2(PCy3)2 (1) reacts with the disilanes (R2SiH)2X to produce dihydride complexes [RuH2{(η2-HSiR2)2X}(PCy3)2] (with R = Me and X O (2a), C6H4 (3), (CH2)2 (4), (CH2)3 (5), OSiMe2O (6)) Ph, (2b)). In these complexes, bis(silane) ligand is coordinated ruthenium via two σ-Si−H bonds, as shown by NMR, IR, X-ray data theoretical calculations. 3, 4, 6 were characterized diffraction. free Si−H bond distances JSi-H values are around 1.49 Å 200 Hz, respectively,...
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Unique Coordination of SiH4: Isolation, Characterization, and Theoretical Study (PR3)2H2Ru(SiH4)RuH2(PR3)2Isabelle Atheaux, Bruno Donnadieu, V. Rodriguez, Sylviane Sabo-Etienne, Chaudret, Khansaa Hussein, Jean-Claude BarthelatView Author Information Laboratoire de Chimie du CNRS 205 route Narbonne, 31077 Toulouse Cedex 04, France Physique Quantique, IRSAMC (UMR 5626) Université Paul Sabatier, 118 Narbonne 31062 4, Cite this: J. Am. Chem....
NMR studies and DFT calculations (B3LYP) are used to elucidate the mechanisms for hydride/(η2-Si-H) hydrogen exchange observed in bis(silane) complexes RuH2[(η2-HSiMe2)2(CH2)2](PCy3)2 (2) RuH2[(η2-HSiPh2)2O](PCy3)2 (4) obtained from reactions of bis(dihydrogen) ruthenium complex RuH2(H2)2(PCy3)2 (1) with corresponding disilane HMe2Si(CH2)2SiMe2H or disiloxane HSiPh2OSiPh2H. Evidence is presented that 2 occurs via formation isomers dihydrogen ligands. Conversion most stable isomer A C2v...
K. Hussein, C. J. Marsden, Barthelat, V. Rodriguez, S. Conejero, Sabo-Etienne, B. Donnadieu and Chaudret, Chem. Commun., 1999, 1315 DOI: 10.1039/A901558B
The new pyridine–borane compound (2-picolyl)BCy2, readily prepared from 2-picolyllithium and ClBCy2, adopts a head-to-tail dimeric structure in the solid state as indicated by X-ray diffraction analysis according to NMR DFT studies, form equilibrates solution with strained monomeric structure; ambiphilic behavior of is illustrated its bridging coordination (p-cymene)RuCl2 unit.
To study the fluxionality of bis(dihydrogen) complex RuH(2)(H(2))(2)(PCy(3))(2) (1), NMR spectra were recorded in Freons (mixture CDCl(3), CDFCl(2), and CDF(2)Cl). 1 was found to remain fluxional at all temperatures, but presence CDCl(3) necessary for its solubilization induces transformation into, first, RuHCl(H(2))(2)(PCy(3))(2) (3) new ruthenium(IV) dihydride RuH(2)Cl(2)(PCy(3))(2) (4). 4 is produced selectively pure reacts further give a mixture chloro complexes. isolated from reaction...
The bis(dihydrogen) complex RuH2(η2-H2)2(PCy3)2 (1) reacts with 2 equiv. of H2SiMePh to produce a mixture Ru2H4(μ-η2:η2:η2:η2-SiH4)(PCy3)4 (2) and RuH2(η2-H2)(η2-HSiPh3)(PCy3)2 (4) together HSiMePh2, HSiMe2Ph traces HMe2SiSiMe2H as result redistribution at silicon. bridging SiH4 ligand in is coordinated the two ruthenium via four σ-Si–H bonds agreement NMR, X-ray data (on 2, 2′ analogous PiPr3 complex) DFT calculations. Each interaction involves σ-donation back-bonding from other ruthenium....
The antioxidant activity of two primary antioxidants, 2,2′‐methylenebis(4‐methyl‐6‐ tert ‐butylphenol) (MMBPH2) and 2,2′‐methylenebis(4,6‐di‐ (MDBPH2), has been studied using the 1,1‐diphenyl‐2‐picrylhydrazyl (DPPH) method. synthesized compounds have successfully characterized systematically elemental analyses, infrared, 1 H NMR 13 C spectra GC–MS. Importantly, it found that compound MMBPH2 in particular is more active DPPH radical scavenging. In addition, density functional theory...
The complex [PBu4]2[Pd2(μ-CO)2Cl4] has been prepared in high yields by carbonylation of [PBu4]2[Pd2Cl6]. Methanol, potassium acetate, or CO readily reacted under ambient conditions to quantitatively afford a series dipalladium(I) complexes, namely [Pd2(μ-CO)2Cl3(OCH3)]2-, [Pd2(μ-CO)2Cl3(OC(O)CH3)]2-, [Pd2(μ-CO)2Cl3(CO)]-, and [Pd2(μ-CO)2Cl2(OCH3)(CO)]-, all which have the Pd2(μ-CO)2 core preserved. All these complexes characterized infrared NMR spectroscopies; νCO stretching wavenumbers...
The coordination of GeH4 to the ruthenium complex RuH2(η2-H2)2(PH3)2 can lead oxidative addition or σ-bond germane. corresponding germyl σ-isomers have been optimized by DFT using B3LYP hybrid functional. most stable isomer corresponds a bis(dihydrogen) RuH(GeH3)(η2-H2)2(PH3)2 (1T-b1) with trans phosphines. It is only 2 kcal mol−1 below σ-isomer RuH2(η2-H2)(η2-H–GeH3)(PH3)2 (1C-a1). This in contrast what has previously observed silane chemistry, which σ-coordination was favoured. However,...
The purpose of this research is to study the chemical composition and effective compounds leaves green tea sage as one traditional medicinal plants.It was found that collected from local market contain 5.68 % moisture, 2.35% ash, 14.57 protein, 8.55 lipids, 2.3% crude fiber.While contained 8.19, 2.17, 12.21, 3.33, 2.6 fiber, respectively.It also 0.376 Polyphenols 0.188 Flavonoids, while 0.262 0.132 respectively.HPLC showed aqueous extract contains eighteen Polyphenols, fifteen them were...