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نمایش تعداد 1-10 از 26

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    Trimerization of sulfur trioxide: a density functional theory study 

    نوع: Conference Paper
    نویسنده : سید حسن کاظمی ریابی; حسین اشتیاق حسینی; مسعود میرزائی شهرابی; Seyed Hasan Kazemi Riabi; Hossein Eshtiagh Hosseini; Masoud Mirzaei Shahrabi
    سال: 2012
    خلاصه:

    Upon condensation of the pure planar gas SO3 (D3h) trimerizes spontaneously, which is often called γ-SO3. It adopts a cyclic structure (C3V) described as [S(=O)2(μ–O)]3. The highly electrophilic nature of γ-SO3 results in ...

    Conformational analysis, structure and vibrational assignment of hexafluoroacetone. A density functional theory study 

    نوع: Conference Paper
    نویسنده : سیدفرامرز طیاری; نشاط خورشیدی جعفرآباد; S. Holakoee; S. Pozhhan; علی رضا برنجی; Sayyed Faramarz Tayyari; Ali Reza Berenji
    سال: 2011
    خلاصه:

    Hexafluoroacetone, HFA, has been used as a stabilizer for peptide structures, as protecting and activating reagent, and as a structure modifier in proteins.

    The vibrational spectra of HFA have been the subject of several studies [1-5]. Berney...

    Structural, potential surface and vibrational spectroscopy studies of hypophosphorous acid in the gas and liquid phases. A theoretical study 

    نوع: Journal Paper
    نویسنده : I Ahmadi; Hedayat Rahemi; سیدفرامرز طیاری; Sayyed Faramarz Tayyari
    سال: 2005
    خلاصه:

    The potential energy surfaces (PES), molecular and vibrational structure of hypophosphours acid (HPA)

    were investigated by HF, MP2 and DFT-B3LYP level of theory using 6-31G** basis set. In order to approach solid ...

    Vibrational Assignment of Trifluorobenzoylacetone 

    نوع: Journal Paper
    نویسنده : سیدفرامرز طیاری; محمد وکیلی; عبدالرضا نکوئی; هدایت راحمی; ونگ; Sayyed Faramarz Tayyari; Mohammad Vakili; Abdo Reza Nekoei
    سال: 2007
    خلاصه:

    Molecular structure and vibrational frequencies of 4,4,4-trifluoro-1-phenyl-1,3-butanedione, known as trifluorobenzoylacetone (TFBA), have
    been investigated by means of density functional theory (DFT) calculations. The ...

    Molecular Structure and Vibrational Spectra Simulation of Macro-porous Lithium Metal Oxide Materials 

    نوع: Conference Paper
    نویسنده : رسول فلاح زاده; نفیسه فرهادیان; rasoul fallahzadeh; Nafishe Farhadian
    سال: 2013
    خلاصه:

    Lithium cobalt oxide (LiCoO2) and Lithium nickel oxide (LiNiO2) as the lithium metal layered oxides have been drawing much attention as cathode materials for advanced rechargeable thin film lithium batteries. These lithium ...

    Metal-Ligand Bond Vibrations In Alkaline Earth Metal Acetylacetonates 

    نوع: Conference Paper
    نویسنده : F. Tayyari; S. F. Tayyari; T. Bakhshi; محمد وکیلی; علی رضا برنجی; Mohamad Vakili; Ali Reza Berenji
    سال: 2013
    خلاصه:



    at the B3LYP/LANL2DZ level to optimize the structures and obtain the vibrational spectra of these compounds. These

    calculations were also repeated for Be, Mg, and Ca acetylacetonates at the B3LYP and BLYP levels using 6-311++G**, 6-

    311G...

    Vibrational assignment of α-cyanoacetylacetone 

    نوع: Journal Paper
    نویسنده : سیدفرامرز طیاری; حیدر رئیسی; فریدون میلانی نژاد; I.S. Butler; Sayyed Faramarz Tayyari; ; سیدفرامرز طیاری; حیدر رئیسی; فریدون میلانی نژاد; I.S. Butler; Sayyed Faramarz Tayyari
    سال: 2001
    خلاصه:

    The infrared and Raman spectra of α-cyanoacetylacetone have been analyzed by the aid of ab initio calculations at post-Hartree–Fock (MP2) and density functional theory (DFT) levels and by considering the spectral behavior ...

    Conformational analysis, tautomerization, IR, Raman, and NMR studies of benzyl acetoacetate 

    نوع: Journal Paper
    نویسنده : سیدفرامرز طیاری; Farnaz Naghavi; Sahar Pojhan; Ryan W. McClurg; Robert Erick Sammelson; Sayyed Faramarz Tayyari
    سال: 2011
    خلاصه:

    A complete conformational analysis of the keto and enol forms of benzyl acetoacetate (BAA), a b-dicarbonyl compound, was carried out by ab initio calculations, at the density functional theory (DFT) level.By inspection of ...

    Hydrogen bond strength and vibrational assignment of the enol form of 3-(ortho-methoxyphenylthio) and 3-(para-methoxyphenylthio) pentane-2,4-dione 

    نوع: Journal Paper
    نویسنده : M. Zahedi; B. Grivani; سیدفرامرز طیاری; Sayyed Faramarz Tayyari
    سال: 2015
    خلاصه:

    The molecular structure of 3-(ortho-methoxyphenylthio) pentane-2,4-dione (o-MPTPD) and 3-(paramethoxyphenylthio)pentane-2,4-dione (p-MPTPD) has been investigated by means of Density

    Functional Theory (DFT) calculations. ...

    Tautomerism, conformational analysis, and spectroscopy studies of 3-bromo-pentane-2,4-dione 

    نوع: Journal Paper
    نویسنده : فاطمه دولتی; سیدفرامرز طیاری; محمد وکیلی; Fatemeh Dolati; Sayyed Faramarz Tayyari; Mohamad Vakili
    سال: 2015
    خلاصه:

    Molecular structures of the stable conformers of cis-enol and keto forms of 3-bromo-pentane-2,4-dione (α-bromo-acetylacetone, BrAA) have been investigated by means of Density Functional Theory (DFT) calculations and the ...

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