IR studies show that Cu+ ions in zeolites CuX, CuY, and CuZSM-5 are able to activate CC bond in alknenes (ethene, propene, but-1-ene, and cis-but-2-ene). The stretching frequency of the CC band decreased by 78115 cm-1, indicating a significant weakening of the double bond. In ...
Structural and IR-spectroscopic evidence is given that directed contacts from terminal alkynes to C C double bonds possess the essential characteristics of weak hydrogen bonds. The contacts are directed at the center of the π-bond rather than at one of the individual C-atoms. The contact ...
[25–29]. p97 is composed of a substrate and cofactor binding N domain followed by two AAA ATPase domains termed D1 and D2, C-terminal and could form a hexameric double-ring structure [30,31] (Fig. 1). D2 has major ATPase activity at physiological temperatures and ATP concentration, ...
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Based on the FT-IR spectra of CO and CO2 adsorbed on the catalysts, the improvement in the CO2 methanation activity was related to a higher positive polarization of ruthenium on the zeolite, which led to a weaker Ru−CO bond on the H-ZSM-5- supported sample with a corresponding increase...
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(CDCl3, 62.5 MHz) δ 152.0, 149.3, 141.1, 135.3, 127.2, 125.7, 124.4, 123.4, 122.6, 121.0, 107.0, 99.1, 80.2, 76.0, 59.3, 57.1, 51.2, 39.1, 32.6, 27.9, 19.6, 16.6; IR (film) νmax 2974, 2931, 1709, 1634, 1446, 1374, 1352, 1332, 1147 cm−1; FABHRMS (NBA/CsI) m/z ...
The IR spectrum displayed absorption bands typical of hydroxyl (3435.27) and carbonyl groups (1653.29). The specific rotation ([α ]2D0.0) value was +18.5 (c 0.1, H2O). The ring structure of 1-DGlcNAc was confirmed through the 1H spectrum (Figure S1) and a series of 2D NMR spectra (...
Near-IR and Optical Morphology of Spiral Galaxies We announce the initial release of data from the Ohio State University Bright Spiral Galaxy Survey, a BVRJHK imaging survey of a well-defined sample of 205... PB Eskridge,JA Frogel,RW Pogge,... - 《Astrophysical Journal Supplement》 被引...