Mass resolved IR spectroscopy of aniline–water aggregates

2016 ◽  
Vol 18 (39) ◽  
pp. 27336-27341 ◽  
Author(s):  
I. León ◽  
P. F. Arnáiz ◽  
I. Usabiaga ◽  
J. A. Fernández
Keyword(s):  
Excited State ◽  
Ir Spectroscopy ◽  
Aromatic Amine ◽  
Aromatic Amines ◽  
Excited State Dynamics

Aniline is the simplest aromatic amine and therefore it is a prototypical system to study the microhydration and excited state dynamics of aromatic amines.

Excited-State Dynamics in the RNA Nucleotide Uridine 5’-Monophosphate Investigated by Femtosecond Broadband Transient Absorption Spectroscopy

2019 ◽  
Author(s):  
Matthew M. Brister ◽  
Carlos Crespo-Hernández
Keyword(s):  
Excited State ◽  
Excited States ◽  
Ground State ◽  
Transient Absorption ◽  
Electronic Energy ◽  
Transient Absorption Spectroscopy ◽  
Electronic Relaxation ◽  
Vibrationally Excited ◽  
Excited State Dynamics ◽  
Π State

<p></p><p> Damage to RNA from ultraviolet radiation induce chemical modifications to the nucleobases. Unraveling the excited states involved in these reactions is essential, but investigations aimed at understanding the electronic-energy relaxation pathways of the RNA nucleotide uridine 5’-monophosphate (UMP) have not received enough attention. In this Letter, the excited-state dynamics of UMP is investigated in aqueous solution. Excitation at 267 nm results in a trifurcation event that leads to the simultaneous population of the vibrationally-excited ground state, a longlived <sup>1</sup>n<sub>O</sub>π* state, and a receiver triplet state within 200 fs. The receiver state internally convert to the long-lived <sup>3</sup>ππ* state in an ultrafast time scale. The results elucidate the electronic relaxation pathways and clarify earlier transient absorption experiments performed for uracil derivatives in solution. This mechanistic information is important because long-lived nπ* and ππ* excited states of both singlet and triplet multiplicities are thought to lead to the formation of harmful photoproducts.</p><p></p>

Modulation of Excited State Dynamics in Lead Halide Perovskite Films with Electrical Bias

2019 ◽  
Author(s):  
Gergely Samu ◽  
R.A. Scheidt ◽  
A. Balog ◽  
C. Janáky ◽  
P.V. Kamat
Keyword(s):  
Excited State ◽  
Excited State Dynamics ◽  
Halide Perovskite ◽  
Electrical Bias ◽  
Lead Halide

scholarly journals P.2.20 Epidemic of bladder cancer in japanese male workers exposed mainly to ortho-toluidine

2019 ◽  
Vol 76 (Suppl 1) ◽  
pp. A93.1-A93
Author(s):  
Makiko Nakano ◽  
Kazuyuki Omae ◽  
Yoko Eitaki ◽  
Satoko Iwasawa ◽  
Kota Fukai ◽  
...  
Keyword(s):  
Bladder Cancer ◽  
Aromatic Amine ◽  
Aromatic Amines ◽  
Organic Dyes ◽  
Cross Sectional Study ◽  
International Agency ◽  
Gross Hematuria ◽  
Cross Sectional ◽  
Exposed Workers ◽  
Medical Histories

BackgroundIn 2012, ortho-toluidine (OT) was listed as a Group 1 carcinogen by the International Agency for Research on Cancer, based on epidemiologic observations in workers co-exposed to OT and aromatic amines. Between 2014 and 2017, 10 cases of bladder cancer (BC) were identified in Japanese males working at two plants of the same company manufacturing intermediates of organic dyes and pigments.ObjectiveTo describe the features of the BC epidemic at the plants.MethodsWe conducted a cross-sectional study of 76 OT and/or aromatic amine-exposed workers including the 10 BC cases at the plants in 2017. The co-exposed aromatic amines were para-toluidine, ortho-anisidine, aniline, 2,4-dimethylaniline, and/or ortho-chloroaniline. Details of each worker’s job-site histories were obtained from the company records. Past medical symptoms and histories were checked in physician interviews. The subjects were divided into the BC group (n=10) and the non-BC group (n=66) and compared. No quantitative exposure data were available. The surrogate level of exposure to each aromatic amine was calculated as the summed job-weight-month in each process in each job-year.ResultsThe mean ages of the non-BC and BC groups were 50 and 56 years and the durations of employment were 23 and 20 years, respectively. The smoking rate in both groups was 80%. Significantly higher rates of gross hematuria (70%) and cystitis (70%) were identified in the BC group’s past medical histories. In the BC group, the surrogate levels of exposure to OT were higher than those of exposures to other aromatic amines. The surrogate levels were high in the job processes of filtering, rinsing, drying and packing products.ConclusionsThe subjects with BC were associated with a high surrogate level of exposure to OT. OT-exposed workers with past histories of gross hematuria and cystitis need a careful follow-up.

Femtosecond Spectroscopic Studies of the One- and Two-Photon Excited-State Dynamics of 2,2,17,17-Tetramethyloctadeca-5,9,13-trien-3,7,11,15-tetrayne:  A Trimeric Oligodiacetylene

2006 ◽  
Vol 110 (40) ◽  
pp. 11435-11439 ◽  
Author(s):  
Grzegorz M. Balkowski ◽  
Michiel Groeneveld ◽  
Hong Zhang ◽  
Cindy C. J. Hendrikx ◽  
Michael Polhuis ◽  
...  
Keyword(s):  
Excited State ◽  
Spectroscopic Studies ◽  
Excited State Dynamics ◽  
Two Photon ◽  
The One
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