Optical properties of pyrrolyl-substituted polysilanes

Synthesis and optical properties of σ–π conjugated aluminum-containing polyphenylcarbosilane (Al-PPCS) by hydrosilylation polymerization

“…In recent years many attempts have been made to develop effective methods for controlling the degree of s-conjugation in polysilanes, such as by introducing functional substituents, modifying the conformation and replacing the Si atoms with foreign atoms. It was reported that introducing p-bonds into polysilanes can create s-p conjugation copolymer with excellent photoelectricity performance [14][15][16][17]. However, these p-bonds are sensitive to radiation (such as double bonds) and result in a short service life.…”

Effect of skeleton conformation on the electronic structure of 50% Ti substituted polysilanes from density functional calculations

“…Polysilanes, in general, have a direct-gap semiconductor. From the optical absorption spectra of a polysilane and from a number of modified polysilanes, the bandgaps are typically in the range of 3-4 eV [13][14][15][16][17][18][19]. Hence the materials are classified as wide bandgap polymers and have been exploited widely in UV-induced photosensitive applications [20,21].…”

Polysilanes and Other Silicon-Containing Polymers

“…Thus, the X-ray crystal structure of this polymer shows an all-trans conformation. The 29 Si-NMR spectrum of this compound in the solid state shows a resonance at 8 3.9. The polymer [SiCl 2 ] n has two reactive chlorine atoms on silicon and therefore the possibility of replacing these by other substituents by a nucleo-philic substitution reaction is present.…”

“…The polymer [SiCl 2 ] n is not soluble in any organic solvent and is extremely moisture sensitive. However, it has been structurally characterized by X-ray crystallography and solid-state 29 Si NMR. Thus, the X-ray crystal structure of this polymer shows an all-trans conformation.…”

“…The 29 Si-NMR spectra of polysilanes show that most of the chemical shifts are in the negative region [4,72]. Representative examples of polymers and their 29 Si-NMR chemical shifts are given in Table 7.1.…”