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Control of the Orientational Order and Nonlinear Optical Response of the “Push−Pull” Chromophore RuPZn via Specific Incorporation into Densely Packed Monolayer Ensembles of an Amphiphilic 4-Helix Bundle Peptide: Second Harmonic Generation at High Chromophore Densities

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/ja1010724· OSTI ID:1036154
 [1];  [2];  [2];  [2];  [2];  [2];  [2]
  1. Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, and Department of Chemistry, Duke University, Durham, North Carolina 27708; University of Pennsylvania
  2. Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, and Department of Chemistry, Duke University, Durham, North Carolina 27708

The macroscopic nonlinear optical response of the push-pull chromophore RuPZn incorporated into a single monolayer of the amphiphilic 4-helix bundle peptide (AP0) covalently attached to a solid substrate at high in-plane density has been measured. The second-order susceptibility, Χzzz, was found to be in the range of 15 - 10-9 esu, consistent with a coherent sum of the nonlinear contributions from the individual chromophores (β{open-square}) as previously measured in isotropic solution through hyper-Rayleigh scattering as well as estimated from theoretical calculations. The microscopic hyperpolarizability of the RuPZn chromophore is preserved upon incorporation into the peptide monolayer, suggesting that the chromophoreâ chromophore interactions in the densely packed ensemble do not substantially affect the first-order molecular hyperpolarizability. The polarization angle dependence of the second harmonic signal reveals that the chromophore is vectorially oriented in the two-dimensional ensemble. Analysis of the order parameter together with information obtained from grazing incidence X-ray diffraction help in determining the chromophore orientation within the AP0 RuPZn monolayer. Taking into account an average pitch angle of ~20° characterizing the coiled-coil structure of the peptide bundle, the width of the bundle's tilt angle distribution should be Ï 20°, resulting in a mean value of the tilt angle 2° ≤ θ0 ≤ 37°.

Research Organization:
Univ. of Pennsylvania, Philadelphia, PA (United States)
Sponsoring Organization:
USDOE SC Office of Basic Energy Sciences (SC-22)
DOE Contract Number:
FG02-04ER46156
OSTI ID:
1036154
Report Number(s):
DOE-ER46156-16
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 28 Vol. 132; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English

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