Interaction of self-assembled monolayers of oligo(ethylene glycol)-terminated alkanethiols with water studied by vibrational sum-frequency generationThe infra-red spectrum of a mixture of deuterated ethylenes has been obtained, and the non-planar fundamentals analyzed. The assignment establishes the twisting frequency as 1027 cm-1 (CJI.). This result leads to a new and more satisfactory assignment of the fundamental vibrational frequencies of ethylene.This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP: 128.248.55.98 On: Mon
Methods of correlation of the physical properties of various normal alkyl series of compounds are described. The properties are for the liquid state and include molal volume, density, molal refraction and refractive index, a t 2 5 O , and the normal boiling point a t 1 atmosphere. The compounds treated include the normal alkyl series of the alkanes, 1-alkenes, cyclopentanes, cyclohexanes, benzenes, 1-alkanethiols, 2-alkanethiols, 1-alkanols, 2-alkanols and alkanoic acids. -Y-( CH2)m-H (1)
Intrinsic Viscosity of Linear Polyethylene in a -Solvent 3109 * wave length. This is compatible with the explanation of the abnormally short wave length of the fourmembered propiolactone in terms of bond angle strain advanced by Closson and Hang.10 According to their interpretation, reduction of the internal angles leads to an increase in the s-character in the -bond of the carbonyl group, which in turn leads to the shortening of both theand -bonds and thus raises the *-1ß ß1.This explanation is also compatible with the high energy of the -* * transition observed in cyclobutanone in comparison with the other members of the series. However, this theory fails to explain the lowest -> * transition energy in cyclopentanone. Also, compounds I and III would be expected to differ significantly, in the degree of strain, yet their n * transition energies are experimentally indistinguishable. At the same time, compound IV should be less strained than either I or III and does show a lower n -* transition energy, which is in qualitative agreement with the strain theory.In spite of the preliminary and tentative nature of the correlations presented in this work, they point to the importance of considering excitation energies in the discussion of C13 chemical shifts.
sample of bicyclooctanone and the Hooker ChemicalCo. for a generous gift of hexachlorocyclopentadiene.
For a system of equivalent bonds undergoing random bond scission it is reasonable to assume that the rate of bond breaking (hence the rate of creation of new molecules) reported in the literature and data presented here demonstrate that the number of molecules created is not proportional to the time of thermal treatment hence they seem to belie this reasonable hypothesis. Other authors have adduced the presence of some non‐equivalent bonds in order to account for the observed cruvature and still retain the hypothesis. Implicit in these arguments is the assumption of a steady‐state concentration of reactive fragments. Our analysis explores the consequences of abandoning the steady‐state assumption and shows that a quantitative explanation of the observed degradation behavior may be had by this means wihile still retaining the hypothesis of a constant probability of a bond being broken per unit time.
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