Second-Harmonic Generation from Floating Monolayers and Langmuir−Blodgett Multilayers of Poly(isocyanide)s

Teerenstra, M.N.; Hagting, J.G.; Schouten, A.J.; Nolte, Roeland J. M.; Kauranen, Martti; Verbiest, Thierry; Persoons, André

doi:10.1021/ma951202w

Cited by 25 publications

(18 citation statements)

References 13 publications

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“…The syntheses of polymers L , L ‐ PIAA , L , D ‐ PIAA 7 and L ‐ PIAAz 9 have been described elsewhere. All other chemicals were commercial products and were used as received.…”

Section: Experimental Partmentioning

confidence: 99%

Determination of the helical sense in alanine based polyisocyanides

Cornelissen

Sommerdijk

Nolte

2002

Macromol. Chem. Phys.

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The assignment of the helix sense in poly(isocyano amino acids) and poly(isocyano peptides) using circular dichroism (CD) spectroscopy is hampered due to overlap of signals arising from the polymer backbone and the side chains. By comparing the CD spectrum of an L‐alanine based polyisocyanide containing a spectator group (i.e. a diazochromophore) with the CD spectra of other L‐alanine‐based polyisocyanides a right‐handed (P) helical backbone geometry has been assigned to these polymers.

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“…The syntheses of polymers L , L ‐ PIAA , L , D ‐ PIAA 7 and L ‐ PIAAz 9 have been described elsewhere. All other chemicals were commercial products and were used as received.…”

Section: Experimental Partmentioning

confidence: 99%

Determination of the helical sense in alanine based polyisocyanides

Cornelissen

Sommerdijk

Nolte

2002

Macromol. Chem. Phys.

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“…The ultimate aim of this work is to be able to use the poly(isocyanide) scaffold and the long-range induction phenomenon to prepare materials with properties that show synergy between the chirality and other characteristics, such as molecular recognition, electrical conductivity, and nonlinear optical effects. 27,28 …”

Section: Introductionmentioning

confidence: 99%

Long‐range effects of chirality in aromatic poly(isocyanide)s

Amabilino

Serrano

Sierra

et al. 2006

J. Polym. Sci. A Polym. Chem.

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The preparation of optically active atropoisomeric polymers which present chiral backbones, thanks to induction during their synthesis from stereogenic centers, located far away from the skeleton is possible, thanks principally to semirigid conformations of the promesogenic spacers between them. The result is that chiral “information” can be passed as far as 21 Å from the asymmetric center to the carbon atom that forms the polymeric chain in poly(isocyanide)s. The sense of chiral induction in these conformationally rigid polymers parallels the helical sense of the cholesteric phases, as well as to the helical senses of chiral smectic C phases, induced by the monomers in nematic and smectic C phases, respectively. All these phenomena obey the odd–even rules proposed for chiral sense changes in these liquid crystalline phases. Noncovalent interactions play an important part in the induction process, in which steric arguments can be used to justify the inductions observed. The methodology can be used to prepare macromolecules, which display switching behavior upon thermal or electrochemical stimulus. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 3161–3174, 2006

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“…176°C. 1 6, 148.6, 133.4, 131.3, 130.4, 130.3, 127.7, 111.4, 108.1, 95.4, 87.1, 51.2, 31.9, 27.4, 27.0, 22.9, 14.3 H,8.70;N,3.45. Found: C,79.00;H,8.58;N,3.55. General procedure for the preparation of amides.…”

Section: -((4-(dihexylamino)phenyl)ethynyl)benzoic Acid [2]mentioning

confidence: 99%

Experimental and Theoretical Study on the One- and Two-Photon Absorption Properties of Novel Organic Molecules Based on Phenylacetylene and Azoaromatic Moieties

et al. 2012

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This Article reports a combined experimental and theoretical analysis on the one and two-photon absorption properties of a novel class of organic molecules with a π-conjugated backbone based on phenylacetylene (JCM874, FD43, and FD48) and azoaromatic (YB3p25) moieties. Linear optical properties show that the phenylacetylene-based compounds exhibit strong molar absorptivity in the UV and high fluorescence quantum yield with lifetimes of approximately 2.0 ns, while the azoaromatic-compound has a strong absorption in the visible region with very low fluorescence quantum yield. The two-photon absorption was investigated employing nonlinear optical techniques and quantum chemical calculations based on the response functions formalism within the density functional theory framework. The experimental data revealed well-defined 2PA spectra with reasonable cross-section values in the visible and IR. Along the nonlinear spectra we observed two 2PA allowed bands, as well as the resonance enhancement effect due to the presence of one intermediate one-photon allowed state. Quantum chemical calculations revealed that the 2PA allowed bands correspond to transitions to states that are also one-photon allowed, indicating the relaxation of the electric-dipole selection rules. Moreover, using the theoretical results, we were able to interpret the experimental trends of the 2PA spectra. Finally, using a few-energy-level diagram, within the sum-over-essential states approach, we observed strong qualitative and quantitative correlation between experimental and theoretical results.

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Second-Harmonic Generation from Floating Monolayers and Langmuir−Blodgett Multilayers of Poly(isocyanide)s

Cited by 25 publications

References 13 publications

Determination of the helical sense in alanine based polyisocyanides

Determination of the helical sense in alanine based polyisocyanides

Long‐range effects of chirality in aromatic poly(isocyanide)s

Experimental and Theoretical Study on the One- and Two-Photon Absorption Properties of Novel Organic Molecules Based on Phenylacetylene and Azoaromatic Moieties

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