Gas-phase structures reflect the pain-relief potency of enkephalin peptides
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N-lithio-2,2,6,6-tetramethylpiperidine [Li(tmp)] reacts with AlX3 (X = Cl, Br) in Et2O/n-hexane soln. to generate of substitution and ether cleavage products, [(tmp)Al(X)(m-OEt)]2 (X = Cl, Br). However, when the reaction is allowed to proceed in n-hexane a ...
The authors describe a two-dimensional high-resoln. solid-state NMR methodol. for correlating the dynamics of mol. rearrangements around the crit. points of equil. phase transitions in mol. solids. It combines the techniques of temp.-jump and two-dimension ...
Using a density functional approach, we study structural and magnetic properties of small Fe-n clusters (nless than or equal to8) deposited on a MgO(100) substrate. Upon deposition, the clusters closely preserve their gas-phase structure. The magnetic mome ...
The deprotonation energies of benzene, chlorobenzene, all di-, tri-, tetrachlorobenzenes, and pentachlorobenzene have been detd. in the gas phase using a Fourier transform ion cyclotron resonance mass spectrometer. The values measured differ only slightly, ...
The adsorption of MeOH on the (110) surface of g-alumina was studied using both ab initio and d. functional theory quantum chem. methods. A [Al3O9H10]+ cluster model comprising one tetrahedral and 2 octahedral Al cations were used to describe the surface a ...
The phase behavior of a DPPC monolayer on water was studied using vibrational sum-frequency spectroscopy (VSFG) in conjunction with fluorescence microscopy. A very sharp transition from a phase with curled alkyl chains to a phase with spatially extended ch ...
Thick GaN layers grown by HVPE on different starting layers were examined. The resulting layers were found to be homogeneous with good crystalline and surface quality over the whole 2-inch wafer, strongly depending on the starting layers and gas phase comp ...
V substituted phosphomolybdic acids could hydroxylate benzene with nearly 100% selectivity at appreciable conversion levels in the presence of oxidizing agents like H2O2 and AcOOH. There appears to be a correlation, for the liq. phase, between phenol yield ...
Equilibrium phase diagrams in composition-conversion space have been calculated for stoichiometric blends of an epoxy resin with a diamine hardener and dendritic hyperbranched polymers, to which various numbers of epoxy groups have been grafted. An attempt ...
Porous semiconducting ceramics deposited on a porous metallic film acting both as catalyst and electronic collector gave large photocurrents and considerably enhanced electrooxidation currents when irradiated in the presence of small amounts of alcohol vap ...