Výsledky vyhledávání - "Mahmoud S. Afifi"

Synthesis, antimicrobial activity, structural and spectral characterization and DFT calculations of Co(II), Ni(II), Cu(II) and Pd(II) complexes of 4-amino-5-pyrimidinecarbonitrile

Autor: Rabei S. Farag, Wajdi M. Zoghaib, Tarek A. Mohamed, Ibrahim A. Shaaban, Mahmoud S. Afifi

Publikováno v: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 135:417-427

Co(II), Ni(II), Cu(II) and Pd(II) complexes of 4-amino-5-pyrimidinecarbonitrile (APC) have been synthesized and characterized using elemental analysis, magnetic susceptibility, mass spectrometry, infrared (4000–200 cm −1 ), UV–Visible (200–11

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e3f2e30bd9ce20181ba34f4c5f23e84e
https://doi.org/10.1016/j.saa.2014.07.018

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Tautomerism, Raman, infrared and ultraviolet–visible spectra, vibrational assignments, MP2 and B3LYP calculations of dienol 3,4-dihydroxypyridine, keto-enol 3-hydroxypyridin-4-one and keto-enol dimer

Autor: Yehia Badr, Lee D. Wilson, Mahmoud S. Afifi, Ibrahim A. Shaaban, Tarek A. Mohamed, Wajdi M. Zoghaib, Rabie S. Farag

Publikováno v: Journal of Molecular Structure. 1043:52-67

Raman (3500–100 cm −1 ) and infrared (4000–200 cm −1 ) spectra of 3,4-dihydroxypyridine (3,4-DHP) have been recorded in the solid phase. In addition, the UV spectrum (350–190 nm) of 3,4-DHP was measured in ethanol solution. Thirteen structu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9899578af62c476b375c76bc9d76967c
https://doi.org/10.1016/j.molstruc.2013.03.041

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Infrared, Raman and temperature-dependent NMR spectra, vibrational assignments, normal coordinate analysis, and DFT calculations of benzoxazoline-2-thione

Autor: Wajdi M. Zoghaib, Ahmed M. Mustafa, Yehia Badr, Mahmoud S. Afifi, Tarek A. Mohamed, Rabei S. Farag

Publikováno v: Vibrational Spectroscopy. 52:128-136

The tautomerism of benzoxazoline-2-thione (BOT; thio-keto) and 2-mercaptobenzoxazole (MBO; thio-enol) has been thoroughly investigated by means of Raman (3600–100 cm−1), infrared (4000–200 cm−1), 1H and 13C NMR spectra and X-ray powder diffra

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2deee93b9bcb19195d6eeea5fe567d3b
https://doi.org/10.1016/j.vibspec.2009.12.001

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Reinvestigation of benzothiazoline-2-thione and 2-mercaptobenzothiazole tautomers: Conformational stability, barriers to internal rotation and DFT calculations

Autor: Rabei S. Farag, Mahmoud S. Afifi, Tarek A. Mohamed, Ahmed M. Mustafa, Yehia Badr, Wajdi M. Zoghaib

Publikováno v: Journal of Molecular Structure: THEOCHEM. 868:27-36

The Raman (3600–100 cm −1 ), infrared (4000–400 cm −1 ), far-infrared (400–200 cm −1 ), 1 H and 13 C NMR spectra of solid benzothiazoline-2-thione (BTT) are recorded. Additionally, the 1 H NMR spectra were obtained at a temperature range

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ab350283af1e00c49f3c952ddbd1426c
https://doi.org/10.1016/j.theochem.2008.07.037

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Infrared and NMR spectra, tautomerism, vibrational assignment, normal coordinate analysis, and quantum mechanical calculations of 4-amino-5-pyrimidinecarbonitrile

Autor: Wajdi M. Zoghaib, Tarek A. Mohamed, Ibrahim A. Shaaban, Rabei S. Farag, Mahmoud S. Afifi, Lee D. Wilson

Publikováno v: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy. 111

The infrared (4000-200 cm(-1)) spectrum for 4-amino-5-pyrimidinecarbonitrile (APC, C5H4N4) was acquired in the solid phase. In addition, the (1)H and (13)C NMR spectra of APC were obtained in DMSO-d6 along with its mass spectrum. Initially, six isome

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d1988d73aef8ba9f3e884f07c4516240
https://pubmed.ncbi.nlm.nih.gov/23669406

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Spectra and structure of silicon-containing compounds. XIX. Raman and infrared spectra, conformational stability, vibrational assignment, barrier to internal rotation, and ab initio calculations of ethyldifluorosilane

Autor: Gamil A. Guirgis, W. A. Herrebout, James R. Durig, Tarek A. Mohamed, Mahmoud S. Afifi

Publikováno v: Journal of Molecular Structure. 319:109-127

Raman (3200 to 10 cm −1 ) and infrared (3200 to 400 cm −1 ) spectra have been recorded for gaseous and solid phases of ethyldifluorosilane, CH 3 CH 2 SiHF 2 . The Raman spectrum of the liquid was also recorded and quantitative depolarization valu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3385e03642014184824d65f02ca62e9e
https://doi.org/10.1016/0022-2860(93)07939-t

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Spectra and structure of silicon-containing compounds. XVIII-Raman and infrared spectra, conformational stability, vibrational assignment, barrier to internal rotation and ab initio calculations of ethyldichlorosilane

Autor: W. A. Herrebout, James R. Durig, Gamil A. Guirgis, Tarek A. Mohamed, Mahmoud S. Afifi

Publikováno v: Journal of Raman spectroscopy

The Raman (3200-10 cm-1) and infrared (3200-30 cm-1) spectra were recorded for gaseous and solid phases of ethyldichlorosilane, CH3CH2SiHCl2. Additionally, the Raman spectrum of the liquid was recorded and quantitative depolarization values were obta

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::42a0e5e6f29803ca9a443d8901867290
https://doi.org/10.1002/jrs.1250250205

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