Langmuir and grafted monolayers of photochromic amphiphilic monodendrons of low generations

Article Abstract:

Four generations of monodendrons with multiple dodecyl alkyl tails, an azobenzene spacer group, and a carboxylic acid polar head were studied at the air-water air-solid interface using atomic force microscopy, grazing incident X-ray diffraction, X-ray reflectivity, and UV-vis spectrometry. The photoisomerization behavior in dilute solutions, at the air-water interface, and for the grafted layers demonstrated that lower generation monodendrons maintained the photochromic behavior after chemical grafting to the silicon substrates, although the confinement of the molecules in monolayers significantly the reorganization time.

Petrochemical Manufacturing, Benzene, Photochromic materials, Azo compounds, Alkyl groups

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Correlating molecular design to microstructure in thermally convertible oligothiophenes: The effect of branched versus linear end groups

Article Abstract:

The near edge X-ray absorption fine structure (NEXAFS) spectroscopy is used to characterize the microstructure development of convertible oligothiophenes and it is found that the bulky, branched end groups of the precursors strongly affect the packing of the conjugated core, whereas the small allyl end groups of the products do not. The dependence on core length of the precursors might be caused by interplay between the packing forces of pi affinity and phase segregation.

X-ray spectroscopy, Structure, Thiophene

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Molecular depth profiling with cluster ion beams

Article Abstract:

A study was conducted to acquire information about the molecular sputtering process of the peptide and trehalose by measurement of secondary ion mass spectra during erosion. The results show that favorable conditions for successful molecular depth profiling are achieved when the total sputtering yield is high and the altered layer thickness is low.

Methods, Ion bombardment, Ion beam irradiation, Secondary ion mass spectrometry

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