Chiral carbazole-based porphyrins showing absorption and circular dichroism in the near-infrared region

2020 ◽  
Vol 24 (01n03) ◽  
pp. 247-251
Author(s):  
Chihiro Maeda ◽  
Tadashi Ema
Keyword(s):  
Circular Dichroism ◽  
Near Infrared ◽  
Infrared Region ◽  
Nir Absorption ◽  
Near Infrared Region ◽  
Induced Aggregation ◽  
First Time ◽  
Circular Dichroïsm

Chiral carbazole-based porphyrins were synthesized for the first time via the incorporation of hydrobenzoin units at the thiophene moieties. They showed absorption and circular dichroism in the near-infrared (NIR) region. The NIR absorption was further red-shifted by solvent-induced aggregation.

scholarly journals The nature of haem a3 in the oxidized state of cytochrome c oxidase. Evidence from low-temperature magnetic-circular-dichroism spectroscopy in the near infrared region

1982 ◽  
Vol 207 (1) ◽  
pp. 167-170 ◽  
Author(s):  
A J Thomson ◽  
D G Englinton ◽  
B C Hill ◽  
C Greenwood
Keyword(s):  
Circular Dichroism ◽  
Cytochrome C ◽  
Cytochrome C Oxidase ◽  
Near Infrared ◽  
Magnetic Circular Dichroism ◽  
Infrared Region ◽  
Magnetic Circular Dichroism Spectroscopy ◽  
Near Infrared Region ◽  
Circular Dichroïsm ◽  
Inhibited Enzyme

The magnetic-circular-dichroism (m.c.d.) spectra of oxidized ‘resting’ bovine cytochrome c oxidase and the cyanide-inhibited form are reported at 5.15 T and at 4.2 K along with m.c.d. magnetization curves plotted at selected wavelengths. In both spectra there are features at 790nm and 1564nm due to Cua and haem a respectively, the e.p.r.-detectable components of the enzyme. There is a new peak at 1946nm only in the spectrum of the cyanide-inhibited enzyme. Arguments are advanced that assign this to low-spin ferric haem a3 bridged to Cua3, thereby forming a ferromagnetically coupled pair of metal ions.

scholarly journals Enhanced circular dichroism in hybrid graphene–metal metamaterials at the near-infrared region

2020 ◽  
Vol 473 ◽  
pp. 125947 ◽  
Author(s):  
Li Hu ◽  
Hongxia Dai ◽  
Feng Xi ◽  
Yuxia Tang ◽  
Fayin Cheng
Keyword(s):  
Circular Dichroism ◽  
Near Infrared ◽  
Infrared Region ◽  
Near Infrared Region ◽  
Circular Dichroïsm

Magnetic circular dichroism of Pseudomonas putida cytochrome P-450 in near infrared region

1978 ◽  
Vol 534 (2) ◽  
pp. 285-294 ◽  
Author(s):  
Tsunenori Nozawa ◽  
Toru Shimizu ◽  
Masahiro Hatano ◽  
Hideo Shimada ◽  
Tetsutaro Iizuka ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Pseudomonas Putida ◽  
Near Infrared ◽  
Magnetic Circular Dichroism ◽  
Infrared Region ◽  
Near Infrared Region ◽  
Cytochrome P 450 ◽  
Circular Dichroïsm

A spectroscopic and theoretical study in the near-infrared region of low concentration aliphatic alcohols

2016 ◽  
Vol 18 (19) ◽  
pp. 13666-13682 ◽  
Author(s):  
Krzysztof B. Beć ◽  
Yoshisuke Futami ◽  
Marek J. Wójcik ◽  
Yukihiro Ozaki
Keyword(s):  
Experimental Data ◽  
Perturbation Theory ◽  
Near Infrared ◽  
Theoretical Study ◽  
Infrared Region ◽  
Second Order ◽  
Aliphatic Alcohols ◽  
Low Concentration ◽  
Near Infrared Region ◽  
First Time

The near-infrared (NIR) spectra of low-concentration (5 × 10−3 M) solutions in CCl4 of basic aliphatic alcohols, methanol, ethanol, and 1-propanol were, for the first time, calculated by second-order vibrational perturbation theory computations and were compared with the corresponding experimental data.

Electrochemical and spectroelectrochemical behavior of planar binuclear naphthalocyanines

2011 ◽  
Vol 15 (11n12) ◽  
pp. 1195-1201 ◽  
Author(s):  
Stanislav A. Trashin ◽  
Tatiana V. Dubinina ◽  
Aleksander V. Fionov ◽  
Larisa G. Tomilova
Keyword(s):  
Electrochemical Reduction ◽  
Near Infrared ◽  
Polar Solvent ◽  
Infrared Region ◽  
Neutral Form ◽  
Cation Radicals ◽  
Near Infrared Region ◽  
Intense Absorption ◽  
First Time

The electrochemical and spectroelectrochemical behavior of two planar binuclear naphthalocyanines containing benzene and naphthalene π-conjugated bridges was investigated for the first time. Their intense absorption in the near infrared region was observed even in a low polar solvent such as o-dichlorobenzene after electrochemical reduction at a potential of -0.4 V vs. SCE, which was not enough to reduce the complexes into their first reduction state. These data and EPR studies allow us to conclude that the electrochemically generated form is the true neutral form of the synthesized compounds whereas the suppression of the near-infrared bands is a result of the presence of their cation radicals as one-electron oxidized forms.

Step-Scan Fourier Transform Vibrational Circular Dichroism Measurements in the Vibrational Region above 2000 cm−1

1997 ◽  
Vol 51 (4) ◽  
pp. 508-511 ◽  
Author(s):  
Fujin Long ◽  
Teresa B. Freedman ◽  
Thomas J. Tague ◽  
Laurence A. Nafie
Keyword(s):  
Fourier Transform ◽  
Circular Dichroism ◽  
Near Infrared ◽  
Optical Transition ◽  
Signal To Noise Ratio ◽  
Infrared Region ◽  
Vibrational Circular Dichroism ◽  
Ft Ir ◽  
Combination Bands ◽  
Circular Dichroïsm

We present the results of a new Fourier transform infrared vibrational circular dichroism (FT-IR-VCD) spectrometer optimized for performance in the near-infrared region above 2000 cm−1. The instrument is capable of operating in either the conventional rapidscan mode or the step-scan mode and is designed around the Bruker IFS 55 FT-IR spectrometer. We find that in the region of hydrogen stretching, the instrument performs as well as or better than (depending on the spectral coverage and resolution desired) a corresponding dispersive grating VCD spectrometer, with noise levels at approximately 10−6 Δ A units for a two-hour collection at 8-cm−1 resolution. The performance is approximately a factor-of-2 better in signal-to-noise ratio in optimized step-scan operation in comparison to the corresponding results in rapid-scan operation. The reasons are traced to advantages in electronic filtering and undersampling efficiency in step-scan mode. It is expected that the advantages of step-scan will increase with increasing optical transition frequency, such as the region of overtone and combination bands between 4000 and 8000 cm−1.

Electrochromic tuning of transparent gold nanorods with poly[(3,4-propylenedioxy)pyrrole] shells in the near-infrared region

2017 ◽  
Vol 5 (47) ◽  
pp. 12571-12584 ◽  
Author(s):  
Jing Zhou ◽  
Ju-Won Jeon ◽  
James F. Ponder ◽  
Jeffrey A. Geldmeier ◽  
Mahmoud A. Mahmoud ◽  
...  
Keyword(s):  
Gold Nanorods ◽  
Near Infrared ◽  
Infrared Region ◽  
Absorption Bands ◽  
Nir Absorption ◽  
Near Infrared Region

An electrochemically tunable plasmonic system with narrow visible-NIR absorption bands was designed by synthesizing poly[(3,4-propylenedioxy)pyrrole] nanoshells onto a AuNR core.

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