scholarly journals Photochemical α-Aminonitrile Synthesis using Zn Phthalocyanines as Near Infrared Photocatalysts

2021 ◽  
Author(s):  
Caroline Grundke ◽  
Rodrigo Silva ◽  
Winald Kitzmann ◽  
Katja Heinze ◽  
Kleber de Oliveira ◽  
...  
Keyword(s):  
Near Infrared ◽  
Photophysical Properties ◽  
Solar Spectrum ◽  
Structural Similarity ◽  
Infrared Region ◽  
Infrared Light ◽  
Near Infrared Light ◽  
High Tendency ◽  
Long Time ◽  
Light Absorbers

While photochemical transformations with sunlight almost exclusively utilize the UV-Vis part of the solar spectrum, the majority of the photons emitted by the sun have frequencies in the near-infrared region. Phthalocyanines show high structural similarity to the naturally occurring light harvesting porphyrins, chlorins and mainly bacteriochlorins, and are also known for being efficient and affordable near-infrared light absorbers as well as triplet sensitizers for the production of singlet oxygen. Although having been neglected for a long time in synthetic organic chemistry due to their low solubility and high tendency towards aggregation, their unique photophysical properties and chemical robustness make phthalocyanines attractive photocatalysts for the application in near-infrared light-driven synthesis strategies. Herein, we report a cheap, simple and efficient photocatalytic protocol, which is easily scalable under continuous flow conditions. Various phthalocyanines were studied as near-infrared photosensitizers in oxidative cyanations of tertiary amines to generate α-aminonitriles, a synthetically versatile compound class.

CuS/RGO hybrid photocatalyst for full solar spectrum photoreduction from UV/Vis to near-infrared light

2018 ◽  
Vol 517 ◽  
pp. 80-85 ◽  
Author(s):  
Jie Wu ◽  
Baibai Liu ◽  
Zhenxing Ren ◽  
Mengying Ni ◽  
Can Li ◽  
...  
Keyword(s):  
Near Infrared ◽  
Solar Spectrum ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Hybrid Photocatalyst

Synthesis, characterization, photophysical properties, and computational studies on N-hexylphenothiazine/cyanopyridine based π-conjugated copolymers

2021 ◽  
pp. 095400832098875
Author(s):  
Ashraf A El-Shehawy ◽  
Adel M Attia ◽  
Abdul-Rahman IA Abdallah ◽  
Morad M El-Hendawy
Keyword(s):  
Density Functional ◽  
Near Infrared ◽  
Photophysical Properties ◽  
Coupling Reaction ◽  
Molecular Structures ◽  
Degree Of Crystallinity ◽  
Infrared Light ◽  
Photovoltaic Properties ◽  
Near Infrared Light ◽  
Conjugated Copolymers

In this paper, π-conjugated copolymers, namely N-hexylphenothiazine/cyanopyridine/phenyl/benzothiadiazole, N-hexylphenothiazine/cyanopyridine/phenyl/9,9-dihexylfluorene, and N-hexylphenothiazine/cyanopyridine/phenyl/9,9-diethylhexylfluorene were readily synthesized via Pd-catalyzed Suzuki cross-coupling reaction. The polymer structures and their photophysical properties were characterized by elemental analysis, 1H NMR, GPC, TGA, XRD, UV-vis absorption and PL spectroscopy measurements. The coupling agent effect on photophysical properties of copolymers was investigated to rationally design polymers with particular physical properties to be employed in optoelectronic devices. The UV-vis absorption spectroscopy of copolymers showed λmax at a range of ∼334–474 nm and red-shifted in their films to a range of ∼342–381 nm. These copolymers displayed highly intense fluorescence in their solutions and films. The PL spectra of copolymers indicated red and near-infrared light, rendering them a prospect for being red and near-infrared light-emitting materials for PLEDs. XRD analysis demonstrated a d-spacing range of ∼3.79–4.32 Å, reflecting π-π stacking and some degree of crystallinity in some polymers, and only P1 and P2 showed peaks in the small-angle region, indicating lamellar structures. To understand the relationship between molecular structures of target materials and their photophysical and photovoltaic properties, density functional theory (DFT) and its time-dependent form (TD-DFT) were employed.

Cr(VI) reduction in presence of ZnS/RGO photocatalyst under full solar spectrum radiation from UV/vis to near-infrared light

2018 ◽  
Vol 315 ◽  
pp. 46-51 ◽  
Author(s):  
Zhenxing Ren ◽  
Lei Li ◽  
Baibai Liu ◽  
Xinjuan Liu ◽  
Zhu Li ◽  
...  
Keyword(s):  
Near Infrared ◽  
Solar Spectrum ◽  
Infrared Light ◽  
Near Infrared Light

Preparation of the W18O49/g-C3N4 heterojunction catalyst with full-spectrum-driven photocatalytic N2 photofixation ability from the UV to near infrared region

2017 ◽  
Vol 41 (17) ◽  
pp. 8920-8926 ◽  
Author(s):  
Hongyu Liang ◽  
He Zou ◽  
Shaozheng Hu
Keyword(s):  
Quantum Efficiency ◽  
Near Infrared ◽  
Infrared Region ◽  
Infrared Light ◽  
Full Spectrum ◽  
Near Infrared Light ◽  
Light Utilization ◽  
Near Infrared Region

This work provides a strategy to improve the quantum efficiency of photocatalysts by promoting near-infrared light utilization.

Fabrication of three-dimensional photonic crystals for near-infrared light by micro-manipulation technique under optical microscope observation

2021 ◽  
Author(s):  
Shun Takahashi ◽  
Erika Kimura ◽  
Takeshi Ishida ◽  
Takeyoshi Tajiri ◽  
Katsuyuki Watanabe ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Near Infrared ◽  
Cavity Mode ◽  
Three Dimensional ◽  
Infrared Region ◽  
Optical Microscope ◽  
Microscope Observation ◽  
Infrared Light ◽  
Near Infrared Light ◽  
20 Nm

Abstract We developed a micro-manipulation technique performed under optical microscope observation, which enabled accurate fabrication of three-dimensional photonic crystals for near-infrared light. Thin GaAs plates having an in-plane pattern were picked up with a fine needle and were mechanically stacked one-by-one by using vertical posts as guides. In spite of the limited spatial resolution in the optical microscope images, the mechanical resolution of the micro-manipulator and the precisely fabricated vertical posts enabled a stacking error as small as 20 nm. Photoluminescence measurement of a nanocavity in the three-dimensional photonic crystals showed a cavity-mode peak in the near-infrared region.

Cu2In2ZnS5/Gd2O2S:Tb for full solar spectrum photoreduction of Cr(VI) and CO2 from UV/vis to near-infrared light

2019 ◽  
Vol 249 ◽  
pp. 82-90 ◽  
Author(s):  
Xinjuan Liu ◽  
Baibai Liu ◽  
Lei Li ◽  
Zhihao Zhuge ◽  
Pengbin Chen ◽  
...  
Keyword(s):  
Near Infrared ◽  
Solar Spectrum ◽  
Infrared Light ◽  
Near Infrared Light

An ordered copper nanowell-array film with near-perfect broadband absorption from ultraviolet to near-infrared light

2020 ◽  
Vol 59 (11) ◽  
pp. 110906
Author(s):  
Juan Shen ◽  
Yong Ren ◽  
Xinxin Zhu ◽  
Min Mao ◽  
Quan Zhou ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Broadband Absorption

scholarly journals Recent Near-Infrared Light-Activated Nanomedicine toward Precision Cancer Therapy

2021 ◽  
Author(s):  
Xiaowei Luan ◽  
Yongchun Pan ◽  
Yanfeng Gao ◽  
Yujun Song
Keyword(s):  
Cancer Therapy ◽  
Near Infrared ◽  
Infrared Light ◽  
Human Society ◽  
Near Infrared Light ◽  
History Of ◽  
The Universe

Light has witnessed the history of mankind and even the universe. It is of great significances to the life of human society, contributing to energy, agriculture, communication, and much more....

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