On the photophysical properties of IrIII, PtII, and PdII (phenylpyrazole) (phenyldipyrrin) complexes

2020 ◽  
Vol 22 (6) ◽  
pp. 3217-3233 ◽  
Author(s):  
Jelena Föller ◽  
Daniel H. Friese ◽  
Stefan Riese ◽  
Jeremy M. Kaminski ◽  
Simon Metz ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Emission Characteristics ◽  
Absorption And Emission ◽  
Theory And Experiment

The absorption and emission characteristics of (ppz)2(dipy)IrIII, (ppz)(dipy)PtII and (ppz)(dipy)PdII, where ppz stands for a phenylpyrazole and dipy for a phenyl meso-substituted dipyrrin ligand, have been investigated by theory and experiment.

Tracing absorption and emission characteristics of halogen-bonded ion pairs involving halogenated imidazolium species

2021 ◽  
Vol 23 (12) ◽  
pp. 7480-7494
Author(s):  
Sarah Karbalaei Khani ◽  
Bastian Geissler ◽  
Elric Engelage ◽  
Patrick Nuernberger ◽  
Christof Hättig
Keyword(s):  
Ion Pairs ◽  
Ion Pairing ◽  
Emission Characteristics ◽  
Absorption And Emission ◽  
Spectroscopic Signatures

Spectroscopic signatures of ion-pairing are identified by variation of counterion and substitution and comparison with theory.

Effect of substituents on absorption and fluorescence properties of pyrazolo[3,4-b]pyrrolo[2,3-d]pyridines

2008 ◽  
Vol 86 (11) ◽  
pp. 1070-1076 ◽  
Author(s):  
Bhausaheb K Ghotekar ◽  
Muddassar A Kazi ◽  
Madhukar N Jachak ◽  
Raghunath B Toche
Keyword(s):  
Good Yield ◽  
Substituent Effect ◽  
Photophysical Properties ◽  
Fluorescence Properties ◽  
Absorption And Emission ◽  
Effect Of Substituents ◽  
Convenient Route

A convenient route was successfully developed for the synthesis of novel heterocycles such as pyrazolo[3,4-b]pyrrolo[2,3-d]pyridines (PPP) from pyrazolo[3,4-b]pyridines in good yield. The PPP derivatives synthesized were further studied for their photophysical properties, and it was observed that absorption and emission λmax changed, owing to the substituent effect at 4 positions. These compounds were obtained from highly reactive starting materials, 5-aminopyrazoles and α-acetyl γ-butyrolactone.Key words: α-acetyl γ-butyrolactone, pyrazolo[3,4-b]pyrrolo[2,3-d] pyridine, absorption, emission, fluorescence.

scholarly journals Biofluorescent Worlds – II. Biological fluorescence induced by stellar UV flares, a new temporal biosignature

2019 ◽  
Vol 488 (4) ◽  
pp. 4530-4545 ◽  
Author(s):  
Jack T O'Malley-James ◽  
Lisa Kaltenegger
Keyword(s):  
Cloud Cover ◽  
Visible Spectrum ◽  
Uv Protection ◽  
Emission Characteristics ◽  
Large Telescope ◽  
Atmospheric Absorption ◽  
Absorption And Emission ◽  
Temporary Change ◽  
Fluorescent State ◽  
M Stars

ABSTRACT Our first targets in the search for signs of life are orbiting nearby M stars, such as the planets in the Proxima Centauri, Ross-128, LHS-1140, and TRAPPIST-1 systems. Future ground-based discoveries, and those from the TESS mission, will provide additional close-by targets. However, young M stars tend to be very active, flaring frequently and causing UV fluxes on the surfaces of HZ planets to become biologically harmful. Common UV-protection methods used by life (e.g. living underground, or underwater) would make a biosphere harder to detect. However, photoprotective biofluorescence, ‘up-shifting’ UV to longer, safer wavelengths, could increase a biosphere's detectability. Here we model intermittent emission at specific wavelengths in the visible spectrum caused by biofluorescence as a new temporal biosignature for planets around active M stars. We use the absorption and emission characteristics of common coral fluorescent pigments and proteins to create model spectra and colours for an Earth-like planet in such a system, accounting for different surface features, atmospheric absorption, and cloud cover. We find that for a cloud-free planet biofluorescence could induce a temporary change in brightness that is significantly higher than the reflected flux alone, causing up to two orders-of-magnitude change in planet–star contrast, compared to a non-fluorescent state, if the surface is fully covered by a highly efficient fluorescent biosphere. Hence, UV-flare induced biofluorescence presents previously unexplored possibilities for a new temporal biosignature that could be detectable by instruments like those planned for the extremely large telescope and could reveal hidden biospheres.

Highly efficient photosensitizers with aggregation-induced emission characteristics obtained through precise molecular design

2017 ◽  
Vol 53 (62) ◽  
pp. 8727-8730 ◽  
Author(s):  
Shidang Xu ◽  
Wenbo Wu ◽  
Xiaolei Cai ◽  
Chong-Jing Zhang ◽  
Youyong Yuan ◽  
...  
Keyword(s):  
Molecular Design ◽  
Emission Characteristics ◽  
Aggregation Induced Emission ◽  
Absorption And Emission ◽  
Highly Efficient ◽  
Tunable Absorption

Through precise molecular design, predictable properties including photosensitizing efficacy, tunable absorption and emission wavelengths and aggregation-induced emission characteristics were achieved.

scholarly journals Absorption and Emission Characteristics of Diffuse Spherical Enclosures

1962 ◽  
Vol 84 (2) ◽  
pp. 188-189 ◽  
Author(s):  
E. M. Sparrow ◽  
V. K. Jonsson
Keyword(s):  
Emission Characteristics ◽  
Absorption And Emission

scholarly journals Unsymmetrically functionalized 5,5″-diaryl- and 5,6,5″-triaryl-2,2′:6′,2″-terpyridines: an efficient synthetic route and photophysical properties

2017 ◽  
Vol 95 (8) ◽  
pp. 851-857 ◽  
Author(s):  
Alexey P. Krinochkin ◽  
Dmitry S. Kopchuk ◽  
Albert F. Khasanov ◽  
Nikolay V. Chepchugov ◽  
Igor S. Kovalev ◽  
...  
Keyword(s):  
Organic Solvents ◽  
Photophysical Properties ◽  
Emission Spectra ◽  
Side Chain ◽  
Synthetic Route ◽  
Absorption And Emission ◽  
Efficient Approach ◽  
Absorption And Emission Spectra ◽  
Acetonitrile Solutions ◽  
Intense Emission

An efficient approach for the synthesis of 5,5″- or 5,6,5″-aryl substituted 2,2′:6′,2″-terpyridines, bearing an anneleted cyclopentene unit in one of the side-chain pyridine rings for the improved solubility in organic solvents, via their 1,2,4-triazine analogues has been developed. By using this approach, various aromatic substituents were introduced in the 2,2′:6′,2″-terpyridine core. Depending on the nature of the aromatic substituents, the obtained terpyridines exhibited an intense emission in a range of ca. 344–394 nm in acetonitrile solutions. For the most representative compounds, pronounced bathochromic shifts in both absorption and emission spectra were observed compared with previously reported substituted terpyridines.

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