α-KETOETHERS: II. INFRARED SPECTRA AND ROTATIONAL ISOMERISM OF PHENACYL ETHERS

Infrared Spectra of High Polymers . II . Polyethylene *

The infrared spectrum of polyethylene has been obtained between about 3000 cm-1 and 70 em-I, polarization measurements on oriented specimens having been obtained to about 350 em-l. Assignments of the fundamentals are made with the help of a group theory analysis. The assignment of the controversial CH. wagging mode is discussed in detail and especially in terms of new evidence from the spectra ...

Crystal Structure and Infrared Spectra of Anhydrous (Adeninato )methylmercury(II)*

The title compound, C6H 7HgN5, belongs to the orthorhombic space group Pbcn, a == 14.658(8), b == 8.407(5), c == 13.006(9) A, D eal == == 2.898 g cm-3, Z == 8 molecules per cell. The structure was refined on 1132 unique nonzero reflections to R == 0.026. The crystal contains the same type of 1 : 1 monomeric molecule as the monohydrate, in which the CH3Hg group is bonded to the N(9) position of ...

Mixed Spectra and Rotational Symmetry

Molecular Rotational Spectra

Rotational spectra of diatomic molecules measured in the high-precision experiments are analyzed. Such a spectrum is usually fitted by an 8th order polynomial in spin. In fact, from the theoretical point of view, the rotational spectrum is expected to be a smooth function of spin. Thus, fitting the rotational spectrum in terms of a low order polynomial in spin seems to be justified. However, th...

Rotational Isomerism in Bis-[/>-(3-Methyl-butyloxy)-phenyl]-thiourea

In case of Thiocarlidum (1) the thermoanalytical examination showed an endothermic transformation without loss of weight. This occured in samples recrystallized from cold polar solvents and the transformation proved to be non-reversible. The UV and IR spectra of the two samples differed characteristically and X-ray studies showed that the two modifications (in the following aand ßmodifications ...