Heterocycles as donor and acceptor units in push-pull conjugated molecules. Part 1

Bradamante, Silva; Facchetti, Antonio; Pagani, Giorgio A.

doi:10.1002/(sici)1099-1395(199707)10:7<514::aid-poc897>3.0.co;2-j

Cited by 80 publications

(59 citation statements)

References 31 publications

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“…The dipolar, positively charged dye PEP+ (Fig. 1) is a push–pull molecule composed by a π-deficient (pyridinium ion) as the acceptor group (A) and a π-excessive (pyrrole) heterocycle as the donor group (D) [19]. PEP+ and its derivatives present remarkable resonant and non-resonant nonlinear optical properties, such as two-photon absorption and second harmonic generation [20–22].…”

Section: Introductionmentioning

confidence: 99%

SERS Properties of Gold Nanorods at Resonance with Molecular, Transverse, and Longitudinal Plasmon Excitations

et al. 2014

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The amplification of Raman signals of the heteroaromatic cation 1-(N-methylpyrid-4-yl)-2-(N-methylpyrrol-2-yl)ethylene (PEP+)) bound to Au nanorods (NRs) was investigated at different excitation wavelengths to study the effect of the laser resonance with the absorption band of the PEP+ moiety and with the two plasmon oscillation modes of the NR. Two different PEP+ derivatives, differing in the length of the alkyl chain bearing the anchoring group, were used as target molecules. Raman spectra obtained exciting at 514 or at 785 nm (i.e., exciting the transverse or the longitudinal plasmon band) present a higher intensity than that at 488 nm suggesting a higher Raman amplification when the laser excitation wavelength is resonant with one of the two plasmon modes. Moreover, considering results of Discrete Dipole Approximation (DDA) calculations of the local field generated at the NR surface when either the transverse or the longitudinal plasmon modes are excited, we deduced that the resonance condition of the 514-nm laser excitation with the absorption band of the dye strongly contributes to the amplification of the Raman signal.

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Section: Introductionmentioning

confidence: 99%

SERS Properties of Gold Nanorods at Resonance with Molecular, Transverse, and Longitudinal Plasmon Excitations

et al. 2014

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“…Compound 1a was prepared as hydrobromide by alkylation of bis(heteroarylethene) precursor 2 [4] with 2-bromoethylamine hydrobromide (Scheme 1). Subsequent treatment with excess triethylamine afforded the free base as an orange solid, which was purified by crystallization from ethanol.…”

Section: Design Strategy Toward Molecular Precursorsmentioning

confidence: 88%

“…A solution of 2-bromoethanol (2.626 g, 21.01 mmol) in acetonitrile (5 ml) was added to a yellow solution of 1-(pyridin-4-yl)-2-(N-methylpyrrol-2-yl)ethylene [4] (3.871 g, 21.01 mmol) in the same solvent (30 ml). Reaction mixturewas refluxed for 4 h and then cooled at room temperature and concentrated to about 10 ml.…”

Section: -[4-n-(2-hydroxyethyl)pyridinium]-2-(n-methylpyrrol-2-yl)etmentioning

confidence: 99%

“…We will show some relevant properties applied to the case of parent molecule 1, member of a class of push-pull systems exhibiting a remarkable NLO 3 rd order activity (two-photon pumped frequency-upconverted green lasing properties, two-photon pumped fluorescence). [3] We will also show that, although compound 1 degrades in solution and in the solid state (neat), [4] it is perfectly stable when chemically incorporated into the PAA matrices.…”

Section: Introductionmentioning

confidence: 99%

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Crosslinked Poly(amido‐amine)s as Superior Matrices for Chemical Incorporation of Highly Efficient Organic Nonlinear Optical Dyes

Abbotto

Beverina

Chirico

et al. 2003

Macromol. Rapid Commun.

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We report on the synthesis and characterization of new crosslinked polymeric matrices, pertaining to the class of poly(amido‐amine)s (PAAs), functionalized with highly performing nonlinear optical (NLO) heterocycle‐based dyes as side‐chain substituents. Linear, soluble, and highly crosslinked NLO‐functionalized PAA networks can be easily prepared under mild conditions. The wide‐ranging tunability of optical and mechanical properties of these matrices makes them a superior alternative to conventional high‐Tg thermoplastic polymers.magnified image

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“…The design and study of these push-pull (D--A) systems have attracted our attention because of their potential application as fluorescent probes, as dye laser systems and in optoelectronics [8,9], especially for their hyperpolarizability properties which make them candidates as components of non linear optical (NLO) materials [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, spectral properties and photobehaviour of push–pull distyrylbenzene nitro-derivatives

Kikaš

Carlotti

Škorić

et al. 2012

Journal of Photochemistry and Photobiology A: Chemistry

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Heterocycles as donor and acceptor units in push-pull conjugated molecules. Part 1

Cited by 80 publications

References 31 publications

SERS Properties of Gold Nanorods at Resonance with Molecular, Transverse, and Longitudinal Plasmon Excitations

SERS Properties of Gold Nanorods at Resonance with Molecular, Transverse, and Longitudinal Plasmon Excitations

Crosslinked Poly(amido‐amine)s as Superior Matrices for Chemical Incorporation of Highly Efficient Organic Nonlinear Optical Dyes

Synthesis, spectral properties and photobehaviour of push–pull distyrylbenzene nitro-derivatives

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