Nonlinear Optical Characterization of Chromophore-Modified Poly[L-glutamate] Thin Films

Tokarski, Zbigniew; Natarajan, Lalgudi V.; Epling, Bob L.; Cooper, Thomas M.; Hussong, Karen L.; Grinstead, Timothy M.; Adams, W. Wade

doi:10.1021/cm00047a028

Cited by 19 publications

(11 citation statements)

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“…The superb fatigue resistance of properly immobilised spiropyrans 127 enable the realisation of information storage devices and holographic optical materials. 423,424 In this context, the strong dependence of the isomerisation kinetics on the microenvironment is particularly attractive, as it can allow for tuning of the information storage time. 425 An ambitious challenge that has yet to be addressed is the reversible control of the remarkable physical properties of graphene by means of isomerisation of surface-immobilised spiropyrans.…”

Section: Discussionmentioning

confidence: 99%

Spiropyran-based dynamic materials

2014

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In the past few years, spiropyran has emerged as the molecule-of-choice for the construction of novel dynamic materials. This unique molecular switch undergoes structural isomerisation in response to a variety of orthogonal stimuli, e.g. light, temperature, metal ions, redox potential, and mechanical stress. Incorporation of this switch onto macromolecular supports or inorganic scaffolds allows for the creation of robust dynamic materials. This review discusses the synthesis, switching conditions, and use of dynamic materials in which spiropyran has been attached to the surfaces of polymers, biomacromolecules, inorganic nanoparticles, as well as solid surfaces. The resulting materials show fascinating properties whereby the state of the switch intimately affects a multitude of useful properties of the support. The utility of the spiropyran switch will undoubtedly endow these materials with far-reaching applications in the near future.

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Section: Discussionmentioning

confidence: 99%

Spiropyran-based dynamic materials

2014

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“…In physisorbed PBLG films, such as deposited by Langmuir-Blodgett-Kuhn technique or spincoating, neighboring polypeptide helices form antiparallel pairs [34]. Solution evaporated PBLG films [37] and spincoated films of PBLG with second-order nonlinear active sidegroups [38] that have been electric field poled, also exhibit the energetically preferred antiparallel alignment of neighboring polypeptide helices.…”

Section: Pblg Monomolecular Filmsmentioning

confidence: 99%

Sum-frequency spectroscopy and imaging of aligned helical polypeptides

Knoesen

Pakalnis

Zhao

et al. 2004

IEEE J. Select. Topics Quantum Electron.

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Abstract-The sum-frequency spectroscopy signatures of NH-(amide A) and C = O (amide I) groups, the amide segments in all proteins, are measured in thin films that consist of an ensemble of right-handed, helical poly--benzyl-L-glutamate (PBLG) macromolecules that are endgrafted and self-organized into a monomolecular film with a large degree of unidirectional order. Distinct sum-frequency spectral signatures associated with the amide A and the amide I bands are observed because of a strong noncentro-symmetry produced by intra-and intermolecular forces. Hydrogen bonding self-organizes amino and acidic groups within the molecular helical scaffold. In an endgrafted thin film, repulsive electrostatic forces between PBLG macromolecules stabilize the organization between molecules. The average orientation of the PBLG chain was measured. Imaging scans using sum-frequency generation, complemented by atomic force microscopy, were used to investigate the uniformity of orientation of the PBLG chains.

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“…12 Disperse red (DR), well-known to undergo a transcis photoisomerization, has a second-order nonlinear property. 13 In this study, we report on the ICD of the DR dye in the diblock copolymeric nanoparticles and phase transition of DR incorporated in thermosensitive PBLG/ PNIPAAm nanoparticles with temperature changes. In particular, differences in the phase transition of DR between PBLG/PNIPAAm and PBLG/PEO nanoparticles with temperature changes will be compared.…”

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confidence: 99%