Zobrazeno 1 - 10
of 11
pro vyhledávání: '"Heinz Wolleb"'
Publikováno v:
The Journal of Physical Chemistry A. 101:6202-6213
Mixed phthalocyanines carrying one anthracene (Pc3An) or substituted naphthalene nucleus (Pc3NcR2, R = H, OCH3, or SC12H25) are proposed as low-temperature photochroms for spectral hole burning. So...
Publikováno v:
Journal of Materials Chemistry. 7:1731-1735
The chlorin–polyvinylbutyral (PVB) guest–host system has been the workhorse for most of the previously reported holographic hole burning experiments. In order to extend the spectral range and to improve on some of its properties we synthesized ch
Autor:
Heinz Wolleb, Elena A. Makarova, Heinz Spahni, Aleksander Rebane, Desiree Peone, Mikhail Drobizhev, Evgeny A. Lukyanets, Nikolay S. Makarov
Publikováno v:
SPIE Proceedings.
We study a new series of asymmetrical phthalocyanines with promising properties for two-photon 3D optical memory. The chromophores have a strong and narrow one-photon absorption (1PA) S 0 -> S 1 band at 730-760 nm, with a 200-400 cm -1 width. Tuning
Publikováno v:
SPIE Proceedings.
Phthalocyanines (Pcs) show exceptional stability against high temperatures (up to 900°C, for certain metallophthalocyanines), harsh chemical environments (strong acids and bases), γ-radiation (up to 100 MRad) and neutron radiation (up to 10 19 ther
Autor:
Aleks Rebane, Desiree Peone, Heinz Spahni, Mikhail Drobizhev, Nikolay S. Makarov, Heinz Wolleb
Publikováno v:
Nonlinear Optical Transmission and Multiphoton Processes in Organics IV.
We study one photon absorption (1PA) and two photon absorption (2PA) properties of a series of asymmetrical phthalocyanines for 2PA-based 3D optical information storage. These compounds show very large 2PA cross section. σ 2 10 3 - 10 4 GM, in near
Publikováno v:
Journal of the Optical Society of America B. 24:1874
We study the requirements imposed on organic photochromes for two-photon absorption (2PA) terabyte volumetric optical storage. We present a quantitative model of signal-to-noise ratio (SNR) and signal-to-background ratio (SBR) when 2PA-induced photoc
Autor:
Hanspeter Pfander, Heinz Wolleb
Publikováno v:
Helvetica Chimica Acta. 69:646-658
C45- and C50-Carotenoids: Synthesis of Optically Active Cyclic C20-Building Blocks and of (2R,2′R)-2,2′-Bis(4-hydroxy-3-methyl-2-butenyl)-β,β-carotene ( = C.p. 450) The synthesis of the optically active C20-building blocks (R)-26 and (R)-39 and
Publikováno v:
Helvetica Chimica Acta. 72:496-501
Synthesis of (R)-β, β-Caroten-2-ol and (2R, 2′R)-β, β-Carotene-2,2′-diol Starting from geraniol, the two carotenoids (R)-β, β-caroten-2-ol (1) and (2R, 2′R)-β, β-carotene-2,2′-diol (3) were synthesized. The optically active cyclic bui
Autor:
Heinz Wolleb, Hanspeter Pfander
Publikováno v:
Helvetica Chimica Acta. 69:1505-1512
C45- and C50-Carotenoids. Synthesis of an Optically Active Cyclic C20-Building Block and of (2R,2′S)-3′,4′-Didehydro-1′,2′-dihydro-2-(4-hydroxy-3-methylbut-2-enyl)-2′-(3-methylbut-2-enyl)-β,ψ-caroten-1′-ol (= C. p. 473) The synthesis
Publikováno v:
Journal of the American Chemical Society. 109:933-935