26198-05-0Relevant articles and documents
An improved efficiency/transparency trade-off for second-harmonic generation by extending the π-electron bridge of an optically nonlinear dye
Ashwell, Geoffrey J.,Whittam, Anne J.,Amiri, Mukhtar A.,Hamilton, Richard,Green, Andrew,Grummt, Ulrich-Walter
, p. 1345 - 1350 (2001)
The second-harmonic intensity from Langmuir-Blodgett films of 5-{4-[2-(4-dimethylaminophenyl)vinyl]benzylidene}-2-octadecyl-5,6,7,8- tetrahydroisoquinolinium octadecyl sulfate(1), interleaved with poly(tert-butyl methacrylate), increases quadratically with thickness to more than 100 bilayers. The susceptibility, molecular hyperpolarisability, thickness, refractive indices and chromophore tilt angle, relative to the substrate normal, are Xzzz(2)=45 ± 5 pm V-1 at 1064 nm, β = 8 × 10-38 m4 V-1, l=3.65 ± 0.12 nm bilayer -1, nω = 1.56 ± 0.01 and ψ = 44 ± 2 °. The moderately high susceptibility arises from an optimised transparency/efficiency trade-off, the alternate-layer LB film being transparent at 1064 nm and having a very slight absorbance of 3.5 × 10-4 bilayer -1 at 532 nm. In contrast, alternate-layer films of the correseponding 7-diethylamino-2-oxo-2H-chromen-3-ylmethylene (2) and 3-(dimethylaminophenyl)prop-2-enylidene (3) derivatives, also reported, have absorbances of 1.1 × 10-3 and 1.5 × 10-3 bilayer-1 at 532 nm and resonantly enhanced susceptibilities of 60 and 95 pm V-1 respectively.
Rational design of amyloid binding agents based on the molecular rotor motif
Sutharsan, Jeyanthy,Dakanali, Marianna,Capule, Christina C.,Haidekker, Mark A.,Yang, Jerry,Theodorakis, Emmanuel A.
scheme or table, p. 56 - 60 (2010/11/02)
New fluorescent probes, designed based on the molecular rotor motif, displayed good affinity for aggregated b-amyloid peptides. The physical and fluorescence properties of these probes can be fine tuned by modifying their chemical structures. These findin
