FIRST-ROW TRANSITION METAL COMPLEXES OF OMEPRAZOLE
... Omeprazole (OME) is a proton pump inhibitor (PPI). PPIs have enabled to improve the treatment of various acid-peptic disorders. OME is a weak base and it can form several complexes with transition and non-transition metal ions. In the present paper, we are describing series of transition metal compl ...
... Omeprazole (OME) is a proton pump inhibitor (PPI). PPIs have enabled to improve the treatment of various acid-peptic disorders. OME is a weak base and it can form several complexes with transition and non-transition metal ions. In the present paper, we are describing series of transition metal compl ...
Two-Electron Reduction of a Vanadium(V) Nitride by CO to Release
... The complete transfer of the N– ligand can be thought of as an atypical example of metallanitrene chemistry. The reaction of metallanitrenes (LnM=NR) with CO to give bound organic isocyanate ligands (LnM(RNCO)) is well documented, but in these examples, the metallanitrene nitrogen atom is often cons ...
... The complete transfer of the N– ligand can be thought of as an atypical example of metallanitrene chemistry. The reaction of metallanitrenes (LnM=NR) with CO to give bound organic isocyanate ligands (LnM(RNCO)) is well documented, but in these examples, the metallanitrene nitrogen atom is often cons ...
Journal of the American Chemical Society, 120(15)
... Abstract: In contrast to porphyrins and chlorins, the direct metalation of bacteriochlorins is difficult. Nevertheless, Cu2+ and Zn2+ can be introduced into bacteriopheophytin in acetic acid, whereas Cd2+ can be inserted in dimethylformamide. The former reactions depend on the substituents of the is ...
... Abstract: In contrast to porphyrins and chlorins, the direct metalation of bacteriochlorins is difficult. Nevertheless, Cu2+ and Zn2+ can be introduced into bacteriopheophytin in acetic acid, whereas Cd2+ can be inserted in dimethylformamide. The former reactions depend on the substituents of the is ...
Integrated X-ray L Absorption Spectra. Counting Holes in Ni
... doped system LixNi1-xO2,3 for Ni with noninnocent ligands such as dithiolenes,4 and for the assignments of EPR signals, and hence oxidation states, of Ni in the Ni-Fe hydrogenases.5-7 There is also interest in the electronic structure of high-valent nickel species,8-13 some of which may be intermedi ...
... doped system LixNi1-xO2,3 for Ni with noninnocent ligands such as dithiolenes,4 and for the assignments of EPR signals, and hence oxidation states, of Ni in the Ni-Fe hydrogenases.5-7 There is also interest in the electronic structure of high-valent nickel species,8-13 some of which may be intermedi ...
Total Internal Reflection Spectroscopy for Studying Soft Matter
... sixth power of the electric fields at the interface. Finally, TIR techniques are useful when experimental considerations prohibit transmission spectroscopy, for example with opaque samples or with small volumes of samples such as proteins. The effective path-length can be controlled by selecting the ...
... sixth power of the electric fields at the interface. Finally, TIR techniques are useful when experimental considerations prohibit transmission spectroscopy, for example with opaque samples or with small volumes of samples such as proteins. The effective path-length can be controlled by selecting the ...
Microwave Spectra, Geometries, and Hyperfine Constants of OCAgX
... extensive search, several lines were identified near 10530 MHz, approximately 250 MHz lower than the position predicted for J ) 4-3 of the described species. The lines were observed readily, requiring only 5 averaging cycles to be distinguished from the background noise. Four lines were found, howev ...
... extensive search, several lines were identified near 10530 MHz, approximately 250 MHz lower than the position predicted for J ) 4-3 of the described species. The lines were observed readily, requiring only 5 averaging cycles to be distinguished from the background noise. Four lines were found, howev ...
The Study of pH Influence on Bovine Liver Catalase by Means of UV
... observed: 504, 538 and 640 nm (Fig. 1c). The 504 and 640 nm peaks are high-spin charge-transfer porphyrin (pS) to iron (dS) bands, 538 nm peak originated from S-S* transitions in the haeme group [6]. Both acidic and alkaline environment causes decrease of absorption bands and the shift of peaks. The ...
... observed: 504, 538 and 640 nm (Fig. 1c). The 504 and 640 nm peaks are high-spin charge-transfer porphyrin (pS) to iron (dS) bands, 538 nm peak originated from S-S* transitions in the haeme group [6]. Both acidic and alkaline environment causes decrease of absorption bands and the shift of peaks. The ...
Amber Setup
... • Amber is a very sophisticated piece of scientific software and as such requires some amount of time to learn it. • Although Amber may appear very complex at first, it is reasonably straightforward once you understand the basic architecture and option choices. • The best source of help for active u ...
... • Amber is a very sophisticated piece of scientific software and as such requires some amount of time to learn it. • Although Amber may appear very complex at first, it is reasonably straightforward once you understand the basic architecture and option choices. • The best source of help for active u ...
CUCURBIT[7]URIL HOST-GUEST COMPLEXES WITH DRUG MOLECULES CONTAINING ISOQUINOLINE GROUPS Julian Kwok by
... host-guest interactions were studied using UV-visible and 1H NMR spectroscopy and high-resolution electrospray ionization mass spectrometry. A focus of this thesis is an investigation of the effects of varying the chemical structure within a series of isoquinoline-based guest on the strength of the ...
... host-guest interactions were studied using UV-visible and 1H NMR spectroscopy and high-resolution electrospray ionization mass spectrometry. A focus of this thesis is an investigation of the effects of varying the chemical structure within a series of isoquinoline-based guest on the strength of the ...
Dual-color total internal reflection fluorescence cross
... significantly improved selectivity and applicability.8 FCCS institutes two differently colored labels and realizes the distinction between coinciding and separated occurrence of these labels. It thus introduces a useful tool to monitor various biological assays including molecular binding between tw ...
... significantly improved selectivity and applicability.8 FCCS institutes two differently colored labels and realizes the distinction between coinciding and separated occurrence of these labels. It thus introduces a useful tool to monitor various biological assays including molecular binding between tw ...
High-resolution molecular structure of a peptide
... 712 兩 www.pnas.org兾cgi兾doi兾10.1073兾pnas.0304849101 ...
... 712 兩 www.pnas.org兾cgi兾doi兾10.1073兾pnas.0304849101 ...
Effective Hamiltonian in the Problem of a
... less uniquely defined (indeed its size depends on temperature). Finally, a similar central spin model was considered a long time ago by Gaudin, who wrote down a set of Bethe ansatz equations for it [12]. ...
... less uniquely defined (indeed its size depends on temperature). Finally, a similar central spin model was considered a long time ago by Gaudin, who wrote down a set of Bethe ansatz equations for it [12]. ...
52 - University of Strathclyde
... † Electronic supplementary information (ESI) available: CIF les giving crystallographic results, experimental details and copies of the NMR spectra. CCDC 923037–923041. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c3sc52101j ...
... † Electronic supplementary information (ESI) available: CIF les giving crystallographic results, experimental details and copies of the NMR spectra. CCDC 923037–923041. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c3sc52101j ...
Nuclear Magnetic Resonance and Potentiometric
... were determined in a NMR study of the triaza macrocyclic amine, its trimethylated analogue, and NOTA and compared with values reported for linear polyamino polycarboxylates and cyclic tetraaza tetracarboxylate ligands. The results indicate that two nitrogens of NOTA are protonated at higher pH than ...
... were determined in a NMR study of the triaza macrocyclic amine, its trimethylated analogue, and NOTA and compared with values reported for linear polyamino polycarboxylates and cyclic tetraaza tetracarboxylate ligands. The results indicate that two nitrogens of NOTA are protonated at higher pH than ...
Magnetic Light-Matter Interactions in a Photonic Crystal Nanocavity
... our near-field probe with this configuration. The sensitivity of the system can be increased by choosing a cavity with a higher quality factor. As cavities with a quality factor Q > 106 have recently become available [19], it should be possible to detect a relative shift of =0 ¼ 1=Q 3 107 an ...
... our near-field probe with this configuration. The sensitivity of the system can be increased by choosing a cavity with a higher quality factor. As cavities with a quality factor Q > 106 have recently become available [19], it should be possible to detect a relative shift of =0 ¼ 1=Q 3 107 an ...
Title Magnetic Light-Matter Interactions in a Photonic Crystal
... our near-field probe with this configuration. The sensitivity of the system can be increased by choosing a cavity with a higher quality factor. As cavities with a quality factor Q > 106 have recently become available [19], it should be possible to detect a relative shift of =0 ¼ 1=Q 3 107 an ...
... our near-field probe with this configuration. The sensitivity of the system can be increased by choosing a cavity with a higher quality factor. As cavities with a quality factor Q > 106 have recently become available [19], it should be possible to detect a relative shift of =0 ¼ 1=Q 3 107 an ...
Unusually Strong Dependence of Conformation on Solvent
... RT ln(Ke,aq/Ke,org) ) Aaq - Aorg ) RT ln(Pcis/Ptrans) (7) ∆G°orgfaq ) (G°cis - G°trans)aq (G°cis - G°trans)org ) Aaq - Aorg (8) Therefore the ∆∆G°s in Table 1 also represent Aaq - Aorg, the difference in A values between aqueous methanol and pentane. These can be quite large, especially for some dia ...
... RT ln(Ke,aq/Ke,org) ) Aaq - Aorg ) RT ln(Pcis/Ptrans) (7) ∆G°orgfaq ) (G°cis - G°trans)aq (G°cis - G°trans)org ) Aaq - Aorg (8) Therefore the ∆∆G°s in Table 1 also represent Aaq - Aorg, the difference in A values between aqueous methanol and pentane. These can be quite large, especially for some dia ...
Organic Chemistry
... substitution by pyrene and alkyl groups were later performed in order to obtained the expected compounds. The characterizations and photophysical property investigations were also reported. Br ...
... substitution by pyrene and alkyl groups were later performed in order to obtained the expected compounds. The characterizations and photophysical property investigations were also reported. Br ...
Syllabus of M.Sc – Chemistry
... Interconversion of Fischer, Newman and Sawhorse projections, Molecules with more than one chiral center, Threo and erythro isomers, Methods of resolution, Optical purity, Enantiotopic and diastereotopic atoms, Groups and faces, Stereospecific and Stereoselective synthesis. Optical activity in the ab ...
... Interconversion of Fischer, Newman and Sawhorse projections, Molecules with more than one chiral center, Threo and erythro isomers, Methods of resolution, Optical purity, Enantiotopic and diastereotopic atoms, Groups and faces, Stereospecific and Stereoselective synthesis. Optical activity in the ab ...
HYDROLYSIS OF 2,4-DITHIOPHENOBARBITAL
... (etanol, nm): 253.2, 259.6, 265.2, 1H NMR (DMSO) (δ, ppm): 0,825 (t, 3H, J = 7.5 Hz, CH3-CH2-), 2.200 (q, 2H, J = 7.5, CH3-CH2-), 7.20-7.40 (m, 5H, C6H5-), acidic properties ñ decoloration of basic phenolphtalein solution. The results presented above allow to postulate that under the conditions empl ...
... (etanol, nm): 253.2, 259.6, 265.2, 1H NMR (DMSO) (δ, ppm): 0,825 (t, 3H, J = 7.5 Hz, CH3-CH2-), 2.200 (q, 2H, J = 7.5, CH3-CH2-), 7.20-7.40 (m, 5H, C6H5-), acidic properties ñ decoloration of basic phenolphtalein solution. The results presented above allow to postulate that under the conditions empl ...
communications - University of California, Berkeley
... solution of all possible isomers (with point group symmetry): DDDD (T), DDDL (C3), DDLL (S4), and their mirror images. In contrast, the tetrahedral complex [Ga426] has strongly coupled metal centers, such that if one metal center initially has a L configuration, the metal center across an edge from ...
... solution of all possible isomers (with point group symmetry): DDDD (T), DDDL (C3), DDLL (S4), and their mirror images. In contrast, the tetrahedral complex [Ga426] has strongly coupled metal centers, such that if one metal center initially has a L configuration, the metal center across an edge from ...
The Fundamentals of Infrared Spectroscopy
... When infrared light is incident on the molecule, the frequency which corresponds with the natural vibrational frequency may be absorbed by the molecule, increasing the magnitude of the natural molecular vibrations. Some bonds absorb more strongly than others, and some compounds give very complex spe ...
... When infrared light is incident on the molecule, the frequency which corresponds with the natural vibrational frequency may be absorbed by the molecule, increasing the magnitude of the natural molecular vibrations. Some bonds absorb more strongly than others, and some compounds give very complex spe ...
Solid-State 23Na Nuclear Magnetic Resonance of Sodium
... Among NMR active alkali metal nuclei, 23Na is relatively easy to study because of its 100% natural abundance and relatively high magnetogyric ratio, γ ) 7.0761 × 107 rad‚s-1‚T-1. However, the fact that 23Na is also a quadrupolar nucleus (I ) 3/2 and Q ) 0.1 × 10-28 m2) imposes some practical difficu ...
... Among NMR active alkali metal nuclei, 23Na is relatively easy to study because of its 100% natural abundance and relatively high magnetogyric ratio, γ ) 7.0761 × 107 rad‚s-1‚T-1. However, the fact that 23Na is also a quadrupolar nucleus (I ) 3/2 and Q ) 0.1 × 10-28 m2) imposes some practical difficu ...
Instruments for Optical Spectroscopy-Web
... interferometer configurations than the set-up described by Michelson, e.g. Happ-Genzel) in the interferometer from the zero position is determined with the interferogram of a helium-neon (He-Ne) laser with a wavelength of 0.633 µm. - As the wavelength of the laser is known exactly and remains consta ...
... interferometer configurations than the set-up described by Michelson, e.g. Happ-Genzel) in the interferometer from the zero position is determined with the interferogram of a helium-neon (He-Ne) laser with a wavelength of 0.633 µm. - As the wavelength of the laser is known exactly and remains consta ...
View accepted manuscript: Metastable triply charged diatomic
... Although diatomic trications have been produced before [7,16], they have not been produced by optical means or in large quantities. Optical production is important since it opens the possibility for precision spectroscopy on this new class of simple molecules. The model that allows us to discuss the ...
... Although diatomic trications have been produced before [7,16], they have not been produced by optical means or in large quantities. Optical production is important since it opens the possibility for precision spectroscopy on this new class of simple molecules. The model that allows us to discuss the ...
Nuclear magnetic resonance spectroscopy
Nuclear magnetic resonance spectroscopy, most commonly known as NMR spectroscopy, is a research technique that exploits the magnetic properties of certain atomic nuclei. It determines the physical and chemical properties of atoms or the molecules in which they are contained. It relies on the phenomenon of nuclear magnetic resonance and can provide detailed information about the structure, dynamics, reaction state, and chemical environment of molecules. The intramolecular magnetic field around an atom in a molecule changes the resonance frequency, thus giving access to details of the electronic structure of a molecule.Most frequently, NMR spectroscopy is used by chemists and biochemists to investigate the properties of organic molecules, although it is applicable to any kind of sample that contains nuclei possessing spin. Suitable samples range from small compounds analyzed with 1-dimensional proton or carbon-13 NMR spectroscopy to large proteins or nucleic acids using 3 or 4-dimensional techniques. The impact of NMR spectroscopy on the sciences has been substantial because of the range of information and the diversity of samples, including solutions and solids.NMR spectra are unique, well-resolved, analytically tractable and often highly predictable for small molecules. Thus, in organic chemistry practice, NMR analysis is used to confirm the identity of a substance. Different functional groups are obviously distinguishable, and identical functional groups with differing neighboring substituents still give distinguishable signals. NMR has largely replaced traditional wet chemistry tests such as color reagents for identification. A disadvantage is that a relatively large amount, 2–50 mg, of a purified substance is required, although it may be recovered. Preferably, the sample should be dissolved in a solvent, because NMR analysis of solids requires a dedicated MAS machine and may not give equally well-resolved spectra. The timescale of NMR is relatively long, and thus it is not suitable for observing fast phenomena, producing only an averaged spectrum. Although large amounts of impurities do show on an NMR spectrum, better methods exist for detecting impurities, as NMR is inherently not very sensitive.NMR spectrometers are relatively expensive; universities usually have them, but they are less common in private companies. Modern NMR spectrometers have a very strong, large and expensive liquid helium-cooled superconducting magnet, because resolution directly depends on magnetic field strength. Less expensive machines using permanent magnets and lower resolution are also available, which still give sufficient performance for certain application such as reaction monitoring and quick checking of samples. There are even benchtop NMR spectrometers.