He I and He II photoelectron spectra and semi-empirical calculations on the three geometric isomers of 3,3,4,4-tetramethyl-1,2-bis(methoxyimino)cyclobutane

doi:10.1002/RECL.19911100102

Paper

He I and He II photoelectron spectra and semi-empirical calculations on the three geometric isomers of 3,3,4,4-tetramethyl-1,2-bis(methoxyimino)cyclobutane

Published Sep 2, 2010 · F. Stunnenberg, H. Cerfontain, A. Terpstra

Recueil des Travaux Chimiques des Pays-Bas

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Abstract

The experimental (PES) and calculated (MNDO) ionization potentials of the three geometric isomers of 3,3,4,4-tetramethyl-1,2-bis(methoxyimino)cyclobutane [E,E)-, (E,Z)- and (Z,Z)-1] are reported. The derived electronic structures are compared with those of the three isomeric five-membered ring homologues 2. The three different orientations of the two methoxy groups in 1 have only a small effect on the energy of the π levels since the three isomers of 1 are planar [or, as in the (Z, Z)-isomer, almost so], but they have a significant effect on the order of the n+ and n− levels. The variations in the lone-pair order are discussed in terms of through-bond and through-space interactions.

Study Snapshot

The three geometric isomers of 3,3,4,4-tetramethyl-1,2-bis(methoxyimino)cyclobutane have significant effects on the order of n+ and n levels, with a small effect on the energy of the levels.

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

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Paper

He I and He II photoelectron spectra and semi-empirical calculations on the three geometric isomers of 3,3,4,4-tetramethyl-1,2-bis(methoxyimino)cyclobutane

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References

Citations

UV spectroscopy and structures of α‐bis(methoxyimino)alkanes

The -bis(methoxyimino)alkanes exhibit a * absorption band, with variations in sensitivity for structural variations due to variations in inter-iminyl conjugation and ring strain.