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Synthesis and Characterization of Star Polypeptide Nonlinear Optical Materials

Published online by Cambridge University Press:  15 February 2011

Thomas M. Cooper ,
Weijie Su ,
Zbigniew Tokarski  and
W. Wade Adams
Thomas M. Cooper
Affiliation:
Wright Laboratory, WL/MLPJ, 3005 P St. Ste 1, Wright-Patterson AFB, OH 45433
Weijie Su
Affiliation:
Wright Laboratory, WL/MLPJ, 3005 P St. Ste 1, Wright-Patterson AFB, OH 45433
Zbigniew Tokarski
Affiliation:
Science Applications International Corporation, Dayton, OH 45432
W. Wade Adams
Affiliation:
Wright Laboratory, WL/MLPJ, 3005 P St. Ste 1, Wright-Patterson AFB, OH 45433
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Abstract

To develop novel polypeptide-based thin films, a series of star polypeptides modified with nonlinear optical chromophores has been synthesized. Using amino-substituted tetraphenyl porphyrin as an initiator, the N-carboxy anhydride of γ-benzyl L-glutamic acid was polymerized onto the porphyrin at a monomer to initiator ratio 20:1. The resulting four-branch star was modified with a selection of dyes. Dyes that modified both the N-terminus and benzyl side chain were used. We demonstrated feasibility of insertion of a metal ion into the polypeptide porphyrin core. The polypeptide series was characterized by UV/VIS, FTIR, and CD. The UV/VIS data suggested ease of modification of both the N-terminus and side chains. The FTLR and CD data show the resulting polypeptides were ∝-helical. The results demonstrate the feasibility of modifying the optical properties of a porphyrin by three approaches: insertion of metal, attachment of dye to N-terminus or modification of γ-benzyl L-glutamate side chain.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 351: Symposium V – Molecularly Designed Ultrafine/Nanostructured Materials , 1994 , 233
Copyright
Copyright © Materials Research Society 1994

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References

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