A New Class of Heterocyclic Compounds for Nonlinear Optics

Pan, Hui; Gao, Xuling; Zhang, Yue; Prasad, Paras N.; Reinhardt, Bruce A.; Kannan, Ram

doi:10.1021/cm00053a002

Cited by 52 publications

(23 citation statements)

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“…It is proposed that the crystal structure of Cr 3+ :TGS is better described in the space group P1 instead of the generally accepted space group P2 1 . This proposition is based on the result that the hydrogenbonding scheme in Cr…”

Section: +mentioning

confidence: 99%

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Structural analysis of nonlinear optical materials

Ichharam¹,

Boeyens²

2000

Acta Cryst Sect A

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Section: +mentioning

confidence: 99%

“…Due to its industrial applications, many efforts have been done to obtain large single crystals of good quality [1]. Actually, applied research on KTP is devoted to obtain poled KTP, to perform Quasi Phase Matching.…”

mentioning

confidence: 99%

Structural analysis of nonlinear optical materials

Ichharam¹,

Boeyens²

2000

Acta Cryst Sect A

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“…Styryl derivatives 1 were obtained by Knoevenagel condensation of the corresponding aldehyde with commercially available 2‐methylpyrazine (Scheme ). The use of potassium hydroxide in DMSO (dimsyl potassium), according to the conditions initially described by Pan et al, afforded the condensation products 1 in moderate‐to‐good yields, generally without the need for chromatographic purification (except for 1c ). Bromine derivative 1d was used as the coupling partner in Sonogashira and Suzuki cross‐coupling conditions to obtain tricyclic linear oligomers 2 and 3 , respectively (Scheme ).…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Photophysical Properties of a Series of Pyrazine‐Based Push–Pull Chromophores

et al. 2016

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International audienceEighteen push-pull pyrazine fluorophores are described. Methoxy, dimethylamino, and diphenylamino groups were used as electron-donating groups (EDGs), and six π-conjugated systems consisting of multiple bonds and 1,4-phenylene moieties were used to connect the EDGs to the pyrazine core. The chromophores were obtained by Knoevenagel condensation and palladium-catalyzed cross-coupling reactions starting from com. available 2-methyl- or 2-chloropyrazine. The optical absorption and emission properties of these chromophores were studied in different solvents. Some proved to be highly emissive and exhibit strong emission solvatochromism, which suggests a highly polar emitting state, characteristic of compds. that undergo intramol. charge transfer (ICT). The influences of the various electron-donating groups and π-conjugated systems on the emission and ICT have been carefully studied

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“…These structures have typically been produced from urethanes and acrylates using well‐known photochemistries for free radical polymerization but utilizing multiphoton excitation. Concurrent efforts have focused on developing new photoactivators that have large two‐ and three‐photon absorption cross sections with the goal of accelerating the process, as well as reducing the required photon flux to avoid photodamage in fragile samples (9–13). Other work has tried to parallelize the process through simultaneous multifocal, multiphoton excitation (14).…”

Section: Introductionmentioning

confidence: 99%

New Photoactivators for Multiphoton Excited Three-dimensional Submicron Cross-linking of Proteins: Bovine Serum Albumin and Type 1 Collagen¶†

Pitts

Howell

Taboada

et al. 2007

Photochemistry and Photobiology

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We report the synthesis and optical characterization of two new photoactivators and demonstrate their use for multiphoton excited three‐dimensional free‐form fabrication with proteins. These reagents were developed with the goal of cross‐linking Type 1 collagen. This cross‐linking process produces structures on the micron and submicron size scales. A rose bengal diisopropyl amine derivative combines the classic photoactivator and co‐initiator system into one molecule, reducing the reaction kinetics and increasing cross‐linking efficiency. This derivative was successful at producing stable structures from collagen, whereas rose bengal alone was not effective. A benzophenone dimer connected by a flexible diamine tether was also synthesized. This activator has two photochemically reactive groups and is highly efficient in cross‐linking bovine serum albumin and Type 1 collagen to form stable, robust structures. This approach is more flexible in terms of cross‐linking a variety of proteins than by traditional benzophenone photochemistry. The photophysical properties vary greatly from that of benzophenone, with the appearance of a new, lower energy absorption band (λmax∼370 nm in water) and broad, visible emission band (∼500 nm maximum). This absorption band is highly solvatochromic, suggesting it arises, at least in part, from a charge transfer interaction. Collagens are typically difficult to cross‐link photochemically, and the results here suggest that these two new activators will be suitable for cross‐linking other forms of collagen and additional proteins for biomedical applications such as the de novo assembly of biomimetic tissue scaffolds.

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A New Class of Heterocyclic Compounds for Nonlinear Optics

Cited by 52 publications

References 0 publications

Structural analysis of nonlinear optical materials

Structural analysis of nonlinear optical materials

Synthesis and Photophysical Properties of a Series of Pyrazine‐Based Push–Pull Chromophores

New Photoactivators for Multiphoton Excited Three-dimensional Submicron Cross-linking of Proteins: Bovine Serum Albumin and Type 1 Collagen¶†

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