Changes In Molecular Interactions Research Articles

Photoconductivity of C 60-doped phthalocyanine composites

The influence of the dopant C 60 on the photoconductivity of zinc phthalocyanine (ZnPc) was examined. Measurement of the photoconductive properties shows that C 60 doping leads to a remarkable enhancement of the photosensitivity compared with the corresponding undoped materials. The X-ray powder diffraction pattern and IR spectrum suggest that the enhancement of photoconductivity may be due to a polymorphic transformation and change in molecular interaction in the phthalocyanine composites, as well as the formation of an intermolecular complex through charge transfer interaction between C 60 and ZnPc.

Raman scattering study of butane-1,4-diol dimethacrylate

A study of the Raman light scattering in butane-1,4-diol dimethacrylate was performed in the temperature range 12–37 °C. It was found that the temperature dependence of the relative intensities of the bands deriving from the CC, CO and C—H bonds reveals a discontinuity at ca. 21–24 °C which coincides with the previously observed temperature discontinuity of the optical Kerr effect and Brillouin light scattering. The result is discussed in terms of changes in molecular interactions and arrangement in the liquid compound investigated.

Photoconductivity of phthalocyanine composites II: Double-layered photoreceptor of Fe IIPcPVK

The photoconductivities of double-layered photoreceptors, containing ferrous phthalocyanine (Fe IIPc) and other phthalocyanines as charge generator and polyvinylcarbazole as charge transporter, were studied. The results show an increased photoconductivity of Fe IIPcAlClPc, Fe IIPcNdPc and Fe IIPcMnPc compared with the pure phthalocyanines, but a decreased photoconductivity of Fe IIPcInClPc. In these composites, polymorphic transformation of Fe IIPc occurs and its molecular interaction changes.

Ozone‐induced ultrastructural changes in the plasma membrane of Chlorella sorokiniana

Abstract. Modifications in plasma membrane structure and permeability were observed in Chlorella sorokiniana following exposure to 0.2 gm−3(140 p.p.m.) O3 for 30 min. Sixty‐eight per cent of the cells were plasmolysed after 15 min O3 exposure with disruption of organelles similar to that previously described in higher plants. Freeze‐fracture exposed large areas of plasma membrane in 90% of the control cells and those exposed to O3for short periods. After 20 min O3 90% of the cells cross‐fracture, which indicates a change in molecular interactions in the membrane exposed to O3 The earliest observed ultraslructural alteration is an aggregation of particles on the plasma membrane P face, statistically significant after 10 min O3 Changes in 86Rb influx occur during a similar time. After more extended exposure to O3 the plasma membrane P face shows regions of lipid phase transition to the crystalline state.