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Transference experiments

On the experimental side, small molecule energy transfer experiments may use molecular beam teclmiques [65. 66 and 67] (see also chapter C3.3 for laser studies). [Pg.1055]

As a first step in imderstanding the analysis of energy transfer experiments, it is wortliwhile to summarize tire steps in a typical experiment where CgFg is tire hot donor and carbon dioxide is tire bath receptor molecule. First, excited... [Pg.3003]

INADEQUATE Incredible natural abundance double quantum transfer experiment, segregates AB or AX systems due to homonuclear one-bond couplings of less abundant nuclei, e.g. [Pg.266]

An extensive survey has been carried out by McKervey and coworkers [7], who prepared the carbo-alkoxymethyl ethers of p-tert-h x y calix[4]arene, p-/< r/-butyl calix[6]arene, p-tert-bu y calix[8]arene, ca-lix[4]arene, calix[6Jarene, and calix[8]arene, and measured their abilities to extract cations from the aqueous phase into the nonaqueous phase. They concluded the following general aspects for the phase-transfer experiments (1) the calix[4]arene compounds show the greatest selectivity for Na (2) phase-transfer of Li is inefficient with all of the compounds (3) the calix[6]arene compounds show less affinity for Na than for K, with plateau selectivity for Rb" and Cs (4) the calix[8]ar-ene compounds are the least efficient of the cyclic oligomers, showing low levels of transport and low discrimination for all five cations (5) the calix[6]arene... [Pg.339]

Recently, Deligoz and Yilmaz [24,25] described the preparation of two polymeric calix[4]arene tetra esters (Scheme 4) and their Na -complexation. Based on phase-transfer experiments with these compounds using alkali picrates in water-dichloromethane, they confirmed that polymers are as Na selective as monomers. [Pg.341]

Salt, K. J., and Wintle, C. A., Design and operation of a transistorized bridge-type detector for burnout in boiling heat transfer experiments, AEEW-R.330, H.M. Stationery Office, London (1964). [Pg.292]

Using the properties of water Li and Cheng (2004) computed from the classical kinetics of nucleation the homogeneous nucleation temperature and the critical nu-cleation radius ra. The values are 7s,b = 303.7 °C and r nt = 3.5 nm. However, the nucleation temperatures of water in heat transfer experiments in micro-channels carried out by Qu and Mudawar (2002), and Hetsroni et al. (2002b, 2003, 2005) were considerably less that the homogeneous nucleation temperature of 7s,b = 303.7 °C. The nucleation temperature of a liquid may be considerably decreased because of the following effects dissolved gas in liquid, existence of corners in a micro-channel, surface roughness. [Pg.270]

Population transfer experiments may be selective or nonselective. Selective population transfer experiments have found only limited use for signal multiplicity assignments (SSrensen et al, 1974) or for determining signs of coupling constants (Chalmers et al., 1974 Pachler and Wessels, 1973), since this is better done by employing distortionless enhancement by polarization transfer (DEPT) or Correlated Spectroscopy (COSY) experiments. However, nonselective population transfer experiments, such as INEPT or DEPT (presented later) have found wide application. [Pg.108]

In polarization transfer experiments such as INEPT, the recorded multiplets do not have the standard binomial intensity distributions of... [Pg.111]

Why do quaternary carbons not appear in polarization transfer experiments ... [Pg.121]

What are the principles governing reverse polarization transfer experiments Why are reverse experiments more sensitive than normal experiments ... [Pg.124]

Since many of the signals in COSY spectra are in antiphase, they may not show up as cross-peaks due to the intrinsic nature of the polarization transfer experiment. The intensities of cross-peaks in COSY spectra may be represented by an antiphase triangle (Fig. 5.33B), in contrast to multiplet... [Pg.243]

The NMR techniques discussed so far provide information about proton-proton interactions (e.g., COSY, NOESY, SECSY, 2D y-resolved), or they allow the correlation of protons with carbons or other hetero atoms (e.g., hetero COSY, COLOC, hetero /resolved). The resulting information is very useful for structure elucidation, but it does not reveal the carbon framework of the organic molecule directly. One interesting 2D NMR experiment, INADEQUATE (Incredible Natural Abundance Double Quantum Transfer Experiment), allows the entire carbon skeleton to be deduced directly via the measurement of C- C couplings. [Pg.274]

Selective polarization transfer A polarization transfer experiment in which only one signal is enhanced selectively. [Pg.419]

Transfer experiments of the Langmuir films onto solid substrates and the preparation of LB films were investigated for 43. The deposition of films of 43 occurred regularly on quartz sHdes or silicon wafers with a transfer ratio of 1 0.05. The diblock structure of dendrimer 43 also appeared crucial for efficient transfers of the Langmuir films in order to obtain well-ordered multilayered LB films. Effectively, the transfer of the Langmuir films of the dendrimer 42 with the small polar head group was found to be difficult with a transfer ratio of about... [Pg.104]

Newly synthesized PAMAM dendrimers have a defined size and shape and can be used in gene transfer experiments, but the efficiency of transfection can be greatly increased by a process called activation of the dendrimer. In activation, some of the tertiary amines are removed, resulting in a molecule with a higher... [Pg.230]

This technique is the most widely used and the most useful for the characterization of molecular species in solution. Nowadays, it is also one of the most powerful techniques for solids characterizations. Solid state NMR techniques have been used for the characterization of platinum particles and CO coordination to palladium. Bradley extended it to solution C NMR studies on nanoparticles covered with C-enriched carbon monoxide [47]. In the case of ruthenium (a metal giving rise to a very small Knight shift) and for very small particles, the presence of terminal and bridging CO could be ascertained [47]. In the case of platinum and palladium colloids, indirect evidence for CO coordination was obtained by spin saturation transfer experiments [47]. [Pg.239]

Huizenga, J. R., Grieger, P. F. Wall, F. T. (1950a). Electrolytic properties of aqueous solutions of polyacrylic add and sodium hydroxide. I. Transference experiments using radioactive sodium. Journal of the American Chemical Society, 72, 2636-42. [Pg.87]

Highly interesting for most pharmaceutical applications is the conformahon of a ligand bound to its receptor. In Section 9.3, exchange-transferred experiments... [Pg.209]

Fig. 9.11 The difference in the strength of relaxation processes (A) or the difference in alignment (B) can be used to detect interactions (eg. NOE or RDCs, respectively) of the ligand-receptor complex in exchange-transferred experiments. Fig. 9.11 The difference in the strength of relaxation processes (A) or the difference in alignment (B) can be used to detect interactions (eg. NOE or RDCs, respectively) of the ligand-receptor complex in exchange-transferred experiments.
All these methods have in common that the receptor is not detected so that no size limit applies. Relaxation-based exchange-transferred experiments actually show best performance for longest correlation times, i.e. very large receptors. [Pg.231]

An important aspect of all exchange-transferred experiments is the occurrence of nonspecific binding which contributes equally to the NMR interactions in the bound state and carmot easily be distinguished. Nonspecific interaction is best... [Pg.231]

Figure 5.128. Oxygen transfer experiment with GASLIQ2 showing response of Cli to changes in liquid and gas circulation (Curve A parameters as in program Curve B Fli and Fl2 = 50 Curve C Fli and Fl2 = 5, Fqri = Fqr2 = 1 0. Figure 5.128. Oxygen transfer experiment with GASLIQ2 showing response of Cli to changes in liquid and gas circulation (Curve A parameters as in program Curve B Fli and Fl2 = 50 Curve C Fli and Fl2 = 5, Fqri = Fqr2 = 1 0.

See other pages where Transference experiments is mentioned: [Pg.2659]    [Pg.407]    [Pg.24]    [Pg.432]    [Pg.83]    [Pg.316]    [Pg.354]    [Pg.109]    [Pg.111]    [Pg.145]    [Pg.244]    [Pg.246]    [Pg.259]    [Pg.228]    [Pg.228]    [Pg.230]    [Pg.230]    [Pg.231]    [Pg.231]    [Pg.235]   
See also in sourсe #XX -- [ Pg.98 , Pg.99 ]




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Apparent transfer parameters relevant to the static equilibrium experiment and gel chromatography

B Energy Transfer In Electron and Photon Experiments

Cell transfer experiments

Cell-transfer limiting dilution experiment

Charge-Transfer Polarization from Experiment

Coherence transfer experiments

Coupling constant, determination Hartmann-Hahn transfer experiments

Cross-polarization population transfer experiments

Distortionless enhanced polarization transfer experiment DEPT)

Distortionless enhanced polarization transfer experiments

Dye molecules, zeolite L channels transfer experiments

Electron transfer cross-beam experiment

Energy transfer experiments

Energy transfer, molecular dyes in zeolite migration experiments

Ethyl chloride, transference experiments

Exchange-transferred experiments

Experiment 5.4 Electron Transfer Reaction between

Fluorescence resonance energy transfer (FRET experiments

Fluorescence resonance energy transfer experiments

Forster energy transfer experiments from Trp residues to calcofluor white

Hartmann-Hahn transfer combination experiments

Hartmann-Hahn transfer experiments

Heat transfer experiments

INADEQUATE transfer experiment

Incredible natural abundance double quantum transfer experiment

Incredible natural abundance transfer experiment,

Insensitive nuclei enhancement by polarization transfer experiment

Magnetization transfer experiment

Nuclear magnetic resonance saturation transfer experiments

Organic transfer, simple experiments

Phase transfer catalysts, laboratory experiments

Photoinduced electron transfer experiment

Population transfer experiments

Single-photon processes, dye molecules visual energy transfer experiments

Spin population transfer experiments

Steady state experiments electron transfer kinetics

Supramolecularly organized luminescent dye transfer experiments

The Transfer of Experience

The role of experience transfer

Theory and Experiment of Singlet Excitation Energy Transfer in Mixed Molecular Crystals

Transfer Limiting Dilution Experiments

Transfer NOE experiments

Transfer equilibrium experiments

Transfer of experience

Transfer, simple experiments

Transference moving-boundary experiments

Water magnetization transfer experiments

Zeolite L channels, supramolecularly organized transfer experiments

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