Hydrogen nesting

From the data reported in Fig. 8, it clearly emerges that the acidity of the silicalite-l/H20 and of the TS-I/H2O systems are remarkably different (compare open and full circles in Fig. 8). This difference can be explained as follows TS-1 has two main acidic sites, Ti(IV) Lewis sites and silanols, mainly located in the internal defective nests (see Sect. 3.8), while only the latter are present in silicalite-1. Addition of H2O2 to siUcaUte-l does not modify the titration curve (compare open circles with open squares in Fig. 8). This means that no additional acidic sites appear in the siUcaUte-l system upon adding H2O2, i.e., that hydrogen peroxide molecules coordinated to internal silanol do not modify their acidity. Conversely, addition of H2O2 to TS-1 moves the whole titration curve toward lower pH values, (compare full circles with full... 

Huot, J., G. Liang, S. Boily, A.V. Neste, and R. Schulz, Structural study and hydrogen sorption kinetics of ball-milled magnesium hydride, /. Alloys Compd., 293-295, 495-500, 1999. 

NExSELECT A catalytic, selective hydrogenation process developed by Neste Oy. Operated inPorvoo, Finland, since 1996. 

Nernst-Einstein equatioon, 5 587 Nernst equation, 9 571 12 206 19 206 Nernst-Planck equation, 9 612-613 Nerol, 3 233 24 479, 501, 503-506 grades of, 24 505 hydrogenation of, 24 506 price of, 24 505 Nerolidol, 24 546-547 Neroliodyl acetate, 24 547 Nerve agents, 5 815, 818-821 Neryl, 24 479 Neryl esters, 24 505 Nesmeyanov reaction, 3 75 Nested fullerenes, 12 231 Nested situations, amount of coverage in experimental design texts compared, S 395t... 

G. Liang, J. Huot, S. Boily, A. Van Neste, R. Schulz, Hydrogen storage properties of the mechanically milled MgH -V nanocomposite, J. Alloys Compd. 291 (1999) 295-299. 

R. Schulz, J. Huot, G. Liang, S. Body, A. Van Neste, Structure and hydrogen sorption properties of ball milled Mg dUiydride, Mater. Sci. Forum 312-314 (1999) 615-622. 

Bond GG, Flores GH, Stafford BA, et al Lung cancer and hydrogen chloride exposure results from a nested case control study of chemical workers. J Occup Med 33 958-961, 1991... 

CARBORANE. A cry stalline compound composed of boron, carbon, and hydrogen. It can be synthesized in various ways, chiefly by the reaction of a borane (penta-or deca-) with acetylene, either at high temperature in the gas phase or in the presence of a Lewis base. Alkylated derivatives have been prepared. Carborancs have different structural and chemical characteristics and should not be conTused with hydrocarbon derivatives or boron hydrides. The predominant structures arc the cage type, the nest type, and the web type, these terms being descriptive of the arrangement of atoms in the crystals. Active research on cargorane chemistry has been conducted under sponsorship of the U.S. Office of Naval Research, http //www.onr.navy.mil/... 

Quint, W., Kaiser, R., Hall, D.S. and Gabrielse, G. (1993). (Anti)hydrogen recombination studies in a nested Penning trap. Hyperfine Interactions 76 181-188. 

Figure 4.6 Hydrogen bonding in functional nests (a) oxyanion hole in serine protease binding the substrate tetrahedral intermediate, (b) P-loop showing the p-phosphate (middle phosphate residue) of GTP bound to a compound nest, (c) Ca2+ binding in calmodulin. The calcium is bound to three carboxylate oxygen atoms which are in turn bound to bound to a five-amide compound nest (d) the cysteine-bound Fe2 unit in spinach ferredoxin.

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