Conformational polymorphism and thermochemical analysis of 5,5'''-bis[(2,2,5,5-tetramethyl-1-aza-2,5-disila-1-cyclopenthyl)ethyl]-2,2':5',2":5",2"'-quaterthiophene

Article Abstract:

The new aspect of polymorphism in oligothiophene compound 5,5'''-bis[(2,2,5,5-tetramethyl-1-aza-2,5-disila-1-cyclopenthyl)ethyl]-2,2':5',2":5",2"'-quaterthiophene is reported in two forms, namely form-I, which is a more stable phase obtained as-synthesized materials, and form II, which is a less stable phase obtained by a solid-melt-solid transformation from form-I. The solid-solid transformation from form-II to form-I is observed in the range between room temperature and melting point, thus concluding that concluded that the system of two polymorphs is monotropic.

Polymorphism (Crystallography), Methyl groups, Ethyl compounds, Methyl compounds, Report

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Ultrafast photoinduced charge separation dynamics in polythiophene/Sn[O.sub.2] nanocomposites

Article Abstract:

An ultrafast infrared transient absorption study of photoinduced interfacial electron transfer (ET) dynamics of Sn[O.sub.2] nanocrystalline thin film sensitized by polythiophene derivatives (regioregular poly(3-hexylthiophene) (P3HT) and regiorandom poly(3-undecyl-2,2'-bithiophene) (P3UBT)) is presented. It is found that in P3HT/Sn[O.sub.2] composites, the interchain charge transfer competes with and reduces the quantum efficiency of interfacial electron transfer at high polymer loading.

Electric properties, Electron transport, Tin compounds

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Photohole screening effects in polythiophenes with pendant groups

Article Abstract:

Two mechanisms that dominate the temperature-dependent changes in electronic structure for poly(3-hexylthiophene-2,5-diyl) (P3HT) are compared. Temperature-dependent changes in the structure and configuration of the polymer backbone are not as significant although temperature-dependent final state effects are observed.

Electroluminescence, Dielectrics, Dielectric materials, Properties

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