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81.
Robert C. Haddon 《Tetrahedron letters》1975,16(11):863-866
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Beer L Brusso JL Haddon RC Itkis ME Kleinke H Leitch AA Oakley RT Reed RW Richardson JF Secco RA Yu X 《Journal of the American Chemical Society》2005,127(51):18159-18170
A synthetic sequence to salts of N-alkylated pyridine-bridged 1,2,3-thiaselenazolo-1,2,3-thiaselenazolylium cations [2]+ (R1 = Me, Et; R2 = H) is described. The corresponding radicals 2 (R1 = Me, Et; R2 = H) can be generated from the cations by chemical or electrochemical reduction. Crystals of the two radicals are isostructural and consist of interpenetrating pi-stacked arrays of closed-shell Se-Se sigma-bonded dimers [2]2 laced together with numerous short intermolecular Se- - -Se, Se- - -S, and Se- - -N contacts. Variable-temperature magnetic, conductivity, and near-infrared optical measurements indicate that the bulk materials behave as small band gap semiconductors with room-temperature conductivities sigma(RT) near 10(-6) S cm(-1) and thermal activation energies Ea of 0.32 eV (R1 = Me) and 0.36 eV (R1 = Et). LMTO band structure calculations on both compounds are consistent with this interpretation. The application of external pressure leads to dramatic increases in conductivity; at 4 GPa sigma(RT) reaches a value near 10(-1) S cm(-1) for R1 = Me and 10(-2) S/cm for R1 = Et. The conductivity remains activated for both compounds, but for R1 = Me the activation energy Ea is reduced to near 0.03 eV at 5 GPa, suggestive of a weakly metallic state. 相似文献
84.
Polyethyleneimine functionalized single-walled carbon nanotubes as a substrate for neuronal growth 总被引:3,自引:0,他引:3
Hu H Ni Y Mandal SK Montana V Zhao B Haddon RC Parpura V 《The journal of physical chemistry. B》2005,109(10):4285-4289
We report the synthesis of a single-walled carbon nanotube (SWNT) graft copolymer. This polymer was prepared by the functionalization of SWNTs with polyethyleneimine (PEI). We used this graft copolymer, SWNT-PEI, as a substrate for cultured neurons and found that it promotes neurite outgrowth and branching. 相似文献
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Beer L Brusso JL Haddon RC Itkis ME Leitch AA Oakley RT Reed RW Richardson JF 《Chemical communications (Cambridge, England)》2005,(12):1543-1545
Resonance stabilized bis-1,2,3-thiaselenazolyl radicals associate in the solid state to afford Se-Se sigma-bonded dimers. 相似文献
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