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Second‐harmonic generation from Langmuir–Blodgett film of cyclic peptide carrying two disperse red 1 on fused quartz surface
Author(s) -
Fujii Shigekatsu,
Morita Tomoyuki,
Kimura Shunsasku
Publication year - 2008
Publication title -
journal of peptide science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 66
eISSN - 1099-1387
pISSN - 1075-2617
DOI - 10.1002/psc.1074
Subject(s) - monolayer , chromophore , second harmonic generation , substrate (aquarium) , langmuir–blodgett film , chemistry , materials science , cyclic peptide , peptide , crystallography , stereochemistry , photochemistry , nanotechnology , optics , laser , biochemistry , physics , oceanography , geology
Cyclic octapeptide carrying one or two nonlinear optical chromophores, disperse red 1 (DR‐1), was synthesized and immobilized on a substrate to attain an active surface for second‐harmonic generation (SHG). Each cyclic octapeptide was transferred on a fused quartz substrate by the Langmuir–Blodgett (LB) method to afford a uniform monolayer. Infrared reflection–absorption spectroscopy of the LB monolayer revealed that the cyclic skeleton lay roughly flat on the surface. The SHG intensity from the monolayer of the cyclic peptide with two DR‐1 units was stronger than that from that with one DR‐1 unit. The difference is discussed in terms of molecular orientation and surface density of the active chromophores. The cyclic peptide is shown here to be an effective scaffold to modify a substrate surface with functional groups of a monolayer with taking stability of the monolayer and orientation of the functional group into consideration. Copyright © 2008 European Peptide Society and John Wiley & Sons, Ltd.