Mohamad Ibrahim

Molécule aux Nanos-objets : Réactivité, Interactions et Spectroscopies

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Lahouari Krim

Molécule aux Nanos-objets : Réactivité, Interactions et Spectroscopies

Jean‐Claude Guillemin

Centre National de la Recherche Scientifique

W. Frey

University of Stuttgart

V. Jager

Patrick Chaquin

Sorbonne Université

Kamal Mansi

Al al-Bayt University

Mukarram H. Zaghal

Yarmouk University

K. H. Al-Obaidi

Al al-Bayt University

T. Philip Malan

University of Arizona

B. Tremblay

Centre National de la Recherche Scientifique

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Al al-Bayt University

Centre National de la Recherche Scientifique

Sorbonne Université

Université Paris Cité

Laboratoire de Réactivité de Surface

University of Stuttgart

Northeastern University

University of Arizona

University of Connecticut

Molécule aux Nanos-objets : Réactivité, Interactions et Spectroscopies

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CCDC 853233: Experimental Crystal Structure Determination

The Cambridge Structural Database (2012)

Atmaram D. Khanolkar Lu Dai Mohamad Ibrahim R. Duclos Ganesh A. Thakur

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccxmvn0

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Infrared Spectroscopy and Density Functional Theory Investigations of the Reactivity of Titanium Atoms with Carbon Monoxide and Water Isolated in Solid Argon: Sequential Evolution from Triplet to Singlet State

The Journal of Physical Chemistry A (2020)

Mohamad Ibrahim P. Soulard M. E. Alikhani B. Tremblay

Thermally evaporated titanium atoms reacted with carbon monoxide and water in solid argon at 12 K to produce the HTiOH–CO and HTiOH–(CO)2 molecules, which were characterized using infrared spectroscopy on the basis of CO, Ti, and water concentration variations and of isotopic substitutions. The insertion product, HTiOH, resulting from the reaction of a titanium atom with a water molecule reacts with CO spontaneously to give the HTiOH–CO molecule, which in turn reacts with a second CO molecule to give HTiOH–(CO)2 The density functional theory calculations were performed to elucidate the geometrical and electronic structures and support the spectral assignments. The topological analysis of the charge density within the experimentally observed molecules allowed us to rationalize the coordination sphere as well as the electron pairing on the titanium center.

Reactivity

10.1021/acs.jpca.9b10909

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CCDC 715596: Experimental Crystal Structure Determination

The Cambridge Structural Database (2009)

W. Frey Mohamad Ibrahim V. Jager

10.5517/ccs0mr4

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Étude de la réactivité du dimère hétéronucléaire PdTi avec le monoxyde de carbone et du titane atomique avec CO et H2O en matrice d’argon et par spectroscopie vibrationnelle FTIR

Mohamad Ibrahim

Le sujet de cette these est l'etude de la reactivite de metaux de transition avec les ligands CO et H2O en utilisant la technique d’isolation en matrices d’argon a 12 K et la spectroscopie infrarouge a transformee de Fourier. Nous avons etudie la reaction du dimere heteronucleaire PdTi avec le CO et nous avons pu identifier les molecules PdTi-CO, TiPd-CO, PdTi(CO)2 et PdTi(CO)3. L’irradiation dans le visible permet de convertir la molecule PdTi-CO avec un CO lie au Ti a la molecule TiPd-CO avec un CO lie au Pd. Dans la deuxieme partie de cette these nous avons etudie la reaction du titane atomique avec deux ligands differents, le CO et H2O. Cette reaction est spontanee et nous avons ainsi caracterise les molecules HTiOH-CO et HTiOH-(CO)2, essentiellement a l’aide des molecules isotopiques du CO et de H2O.Des calculs ont ete effectues avec la theorie de la fonctionnelle de la densite (DFT). La comparaison entre les donnees theoriques et experimentales nous a permis de determiner les parametres geometriques et electroniques des especes etudiees.

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Synthesis and characterization of chromium(III), manganese(II), iron(III), cobalt(II), nickel(II), copper(II), cadmium(II) and dioxouranium(VI) complexes of 4(2-pyridyl)-1-(2,4-dihydroxybenzaldehyde)-3-thiosemicarbazone

Gaber M. Abu El‐Reash Mohamad Ibrahim Kenawy Usama El‐Ayaan M. A. Khattab

A few complexes of Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and dioxouranium(VI) with 4(2-pyridyl)-1-(2,4-dihydroxybenzaldehyde)-3-thiosemicarbazone have been synthesised and characterized on the basis of elemental analysis, IR, electronic NMR, and magnetic moment data. An octahedral structure is proposed for the Cr(III), Fe(III), Co(II) and Ni(H{sub 3}PBT){sub 2} Cl{sub 2}.2H{sub 2}O complexes; a tetrahedral structure for the Mn(II) and Ni{sub 2}(PBT)OAc.H{sub 2}0 complexes and a square planar structure for the Cu(II) complexes. The antimicrobial and antifungal activities of H{sub 3}PBT and of its metal(II) complexes are investigated. The results reveal that H{sub 3}PBT exhibits greater antimicrobial activities than its complexes. (author). 34 refs., 4 figs., 2 tabs.

Semicarbazone

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CCDC 715597: Experimental Crystal Structure Determination

The Cambridge Structural Database (2009)

W. Frey Mohamad Ibrahim V. Jager

10.5517/ccs0ms5

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Study of the reactivity of heteronuclear PdTi dimer with carbon monoxide and of atomic titanitum with CO and H2O in argon matrix and by vibrational FTIR spectroscopy

Mohamad Ibrahim

Heteronuclear molecule

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Matrix (chemical analysis)

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CCDC 258207: Experimental Crystal Structure Determination

The Cambridge Structural Database (2006)

Basem F. Ali K. Al-Soud'od Nayef Al-Ja'ar Ahmed Nassar Mukarram H. Zaghal

10.5517/cc8np8v

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VUV photopolymerization of ketene under interstellar conditions: from the dilute phase to the condensed phase

Monthly Notices of the Royal Astronomical Society (2022)

Mohamad Ibrahim Jean‐Claude Guillemin Lahouari Krim

ABSTRACT The photodecomposition of ketene under interstellar conditions and how the resulting photofragments may recombine in the 3–300 K temperature range could play an important role in investigations related to astrochemistry and astrobiology. Using a combination of bulk ice and rare-gas matrix isolation studies coupled to Fourier transform infrared (FTIR) spectroscopy, this work aims to understand the vacuum ultraviolet (VUV) photochemistry of CH2CO in solid phase to mimic the photochemistry of organic species trapped in the icy interstellar grains. We show that the photolysis of CH2CO depends strongly on the environments where it is trapped. The VUV photolysis of CH2CO/Ne in dilute phase leads to kinetically stable and unstable species such as CO, C2H2, CH4, C2H4, C2H6, H2CO, CH3CHO, HCCO, C2O, C3O, and C4O. However, the same experiment carried out in condensed phase shows that the photolysis of CH2CO ice produces mainly an organic residue, which is directly observed at 10 K and remains stable in solid phase at 300 K. The infrared (IR) spectroscopy analysis suggests that the resulting organic residue could be a polyketone formed at 10 K through the VUV photopolymerization of ketene.

Matrix Isolation

Ultraviolet

10.1093/mnras/stac1452

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CCDC 853232: Experimental Crystal Structure Determination

The Cambridge Structural Database (2012)

Atmaram D. Khanolkar Lu Dai Mohamad Ibrahim R. Duclos Ganesh A. Thakur

10.5517/ccxmvmz

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