نتایج جستجو برای: 311 g

تعداد نتایج: 445730  

2012
SANDHYA RAI HARJINDER SINGH

Interaction of proline with gold cluster was studied using density functional theory (DFT). Two types of mixed basis sets UB3LYP/6-311++G ∪ LANL2MB and UB3LYP/6-311++G ∪ LANL2DZ were used for optimization of complex structures. Proline interacts with gold cluster either through one anchor bond, N–Au or an anchor bond O–Au associated with a non-conventional O–H. . . Au hydrogen bond. Among these...

Journal: :Physical chemistry chemical physics : PCCP 2012
Sudip Pan Gabriel Merino Pratim K Chattaraj

Prompted by the stability of some lithium decorated star-like clusters and super-alkali systems, their hydrogen trapping potential is assessed at the M06/6-311+G(d,p) and the M052X/6-311+G(d) levels, respectively. The effect of an applied electric field is also analyzed. Most of these systems are found to have the potential to become effective hydrogen storage materials with high gravimetric we...

2017
S. Seshadri M. Padmavathy

Extensive vibrational investigations of 1,5-Dichloro-2,3-dinitrobenzene (DCDNB) have been carried out with FT-IR and FTRaman techniques. The electronic structure of the molecule has been analysed by UV-Visible and NMR spectroscopies. This studies were carried out with Hartree-Fock (HF) method utilizing 6-311+G(d,p) and 6-311++G(d,p) basis sets to determine the structural, vibrational and electr...

NBO analysis, hybrid density functional theory (B3LYP/6-311+G**) and ab initio molecular orbital (HF/6-311+G**) based methods were used to study the anomeric effects (AE), electrostatic interactions, dipole-dipole interactions and steric repulsion effects on the conformational properties of 2-methoxy- (1), 2-methylthio- (2), 2-methylseleno- (3), 2-fluoro- (4), 2-chloro- (5) and 2-bromocyclohexa...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه الزهراء - دانشکده علوم پایه 1392

بهینه سازی کامل ساختار و محاسبه ی انرژی پیوند هیدروژنی ایزومر نوع fو ایزومر نوعcl مولکول 2-فلورو-6-کلروفنول توسط نظریه ی تابعی چگالی dft و در سطوح نظری b3lyp و m052x و با سری های پایه ی6-31g** و g**++6-311 محاسبه شده است. طیف 1 h-nmr در فاز گازی و محلولdmso ، برای دو ایزومر مولکول 2-فلورو-6- کلروفنول و مولکول فنول به وسیله ی روش giao، در سطح نظری b3lyp و با سری پایه ی g**++6-311 محاسبه شده ا...

2016
Kinga Salus Marcin Hoffmann Bożena Wyrzykiewicz Donata Pluskota-Karwatka

Etheno adducts are formed in the reactions of DNA bases with chloroacetaldehyde, with lipid peroxidation products, and also with metabolites of vinyl chloride and furan. The presence of such modifications in the genetic material may lead to errors in replication with consequences of mutations and even carcinogenesis. For an understanding of the biological significance of etheno adducts it is im...

Journal: :Optical and Quantum Electronics 2023

Abstract The structure–activity relationship studied by DFT calculations and contacted with practical antimicrobial results for compounds 1–4 is discussed in detail. In light of this have been using DFT/B3LYB/6-311++G (d,p) at the level theory, geometrical parameters, bond lengths angles discussed. quantum mechanical showed that presence phosphorus sulfur atoms changed planarity parent compound...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه زنجان - دانشکده علوم 1392

در کار حاضر جزئیات سازوکار واکنش¬های hso+hs، hso+oh، hso+1o2، hno+o2 و hno+hno مورد بررسی قرار خواهد گرفت. کلیه بهینه سازی ساختارها با استفاده از روش محاسباتی dft در سطح lyp3b و یا با روش 2mp به همراه مجموعه پایه¬های 6-311++g(2df-p)، 6-311++g(3df-3pd) و ztvp-cc aug-صورت گرفته. در مرحله بعد برای محاسبه دقیق¬تر انرژی نسبی، از روش ccsd(t) به ¬صورتsingle point استفاده شده¬است. همچنین روش irc وجود ا...

Hooriye Yahyaei Neda Hasanzadeh

α-acyloxycarboxamides are synthesized from three component Passerini reaction between indane-1,2,3-trione, isocyanides, and thiophenecarboxylic acids in quantitative yields. The structures of the final products were confirmed by IR, 1H and 13C NMR spectroscopy, mass spectrometry, and elemental analysis. The B3LYP/HF calculations for computation of 1H an...

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