Calix[n]arenes Provided with Thiols for Modified Electrode Applications; Ring-size Dependent Voltammetric Behavior toward Ferrocene Derivatives

2000 ◽  
Vol 29 (1) ◽  
pp. 60-61 ◽  
Author(s):  
Koji Nakano ◽  
Sachiko Tanaka ◽  
Makoto Takagi ◽  
Seiji Shinkai
Keyword(s):  
Modified Electrode ◽  
Ring Size ◽  
Ferrocene Derivatives ◽  
Size Dependent ◽  
Voltammetric Behavior

Few-wall carbon nanotubes covalently functionalized by ferrocene groups for bioelectrochemical devices.

2012 ◽  
Vol 1451 ◽  
pp. 111-116
Author(s):  
Naoual Allali ◽  
Veronika Urbanova ◽  
Victor Mamane ◽  
Jeremy Waldbock ◽  
Mathieu Etienne ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electron Transfer ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Carbon Electrode ◽  
Ferrocene Derivatives ◽  
Covalent Functionalization ◽  
Side Walls ◽  
Chemical Groups

ABSTRACTThe present work reports the covalent functionalization of few-wall CNTs (FWCNTs) by ferrocene derivatives to i) improve their dispersion efficiency in water and ii) to graft electroactive chemical groups on their side-walls in order to promote electron transfer to biomolecules. The functionalized CNTs (f-CNTs) are used to modify a glassy carbon electrode and this modified electrode is used for oxidizing the cofactor NADH (dihydronicotinamide adenine dinucleotide).

scholarly journals Carbon ceramic electrode incorporated with zeolite ZSM-5 for determination of Piroxicam

2010 ◽  
Vol 8 (1) ◽  
pp. 155-162 ◽  
Author(s):  
Karim Asadpour-Zeynali ◽  
Mir Majidi ◽  
Mitra Zarifi
Keyword(s):  
Modified Electrode ◽  
Pharmaceutical Formulations ◽  
Differential Pulse ◽  
Solution Ph ◽  
Carbon Ceramic Electrode ◽  
Experimental Parameters ◽  
Voltammetric Behavior ◽  
Carbon Ceramic ◽  
Optimized Conditions

AbstractA new chemically modified electrode is constructed based on carbon ceramic electrode incorporated with zeolite ZSM-5. Voltammetric behavior of piroxicam at the carbon ceramic zeolite modified electrode (CCZME) was investigated. The modified electrode exhibited catalytic activity toward the electrooxidation of piroxicam. Experimental parameters such as solution pH, scan rate, concentration of piroxicam and zeolite amount were studied. It has been shown that using the CCZME, piroxicam can be determined by differential pulse voltammetry (DPV) and hydrodynamic amperometry (HA). Under the optimized conditions the calibration plots are linear in the concentration ranges of 0.20–25.00 and 0.20–50.10 μM with limit of detections of 0.65 and 0.29 μM for DPV and HA, respectively. The modified electrode with DPV and HA methods was successfully applied for analysis of piroxicam in pharmaceutical formulations. The results were favorably compared to those obtained by the spiked method. The results of the analysis suggest that the proposed method has promise for the routine determination of piroxicam in the products examined.

Ring-size dependent orientation in dehydration of 1-[(ethoxycarbonyl)methyl]cycloalkanols

1988 ◽  
Vol 53 (4) ◽  
pp. 893-894 ◽  
Author(s):  
Constantinos G. Screttas ◽  
Ioulia C. Smonou
Keyword(s):  
Ring Size ◽  
Size Dependent

Study of the Voltammetric Behavior of Chloramphenicol and Its Determination At a Ni/C Modified Electrode

1998 ◽  
Vol 31 (2) ◽  
pp. 237-249 ◽  
Author(s):  
Zhao Min ◽  
Hu Jingbo ◽  
Lai Yongchun ◽  
Li Qilong ◽  
Wu Zhongda
Keyword(s):  
Modified Electrode ◽  
Voltammetric Behavior

scholarly journals Aromaticity and Antiaromaticity in the Excited States of Porphyrin Nanorings

2019 ◽  
Author(s):  
Martin Peeks ◽  
Juliane Gong ◽  
Kirstie McLoughlin ◽  
Takayuki Kobatake ◽  
Renee Haver ◽  
...  
Keyword(s):  
Excited State ◽  
Excited States ◽  
Density Functional ◽  
Ring Size ◽  
Critical Importance ◽  
Peak Wavelength ◽  
Functional Theory ◽  
Size Dependent ◽  
Nucleus Independent Chemical Shift ◽  
Radiative Rate

Aromaticity can be a useful concept for predicting the behavior of excited states. Here we show that π-conjugated porphyrin nanorings exhibit size-dependent excited-state global aromaticity and antiaromaticity, for rings containing up to eight porphyrin subunits, although they have no significant global aromaticity in their neutral singlet ground states. Applying Baird’s law, odd rings ([4n] π-electrons) are aromatic in their excited states, whereas the excited states of even rings ([4n+2] π-electrons) are antiaromatic. These predictions are borne out by density functional theory (DFT) studies of the nucleus-independent chemical shift in the T1 triplet state of each ring, which reveal the critical importance of the triplet delocalization to the emergence of excited-state aromaticity. The singlet excited states (S1) are explored by measurements of the radiative rate and fluorescence peak wavelength, revealing a subtle odd-even alternation as a function of ring size, consistent with symmetry-breaking in antiaromatic excited states.

Stereogenic cyclic oligonaphthalenes displaying ring size-dependent handedness of circularly polarized luminescence (CPL)

2019 ◽  
Vol 55 (19) ◽  
pp. 2749-2752 ◽  
Author(s):  
Yuki Nojima ◽  
Masashi Hasegawa ◽  
Nobuyuki Hara ◽  
Yoshitane Imai ◽  
Yasuhiro Mazaki
Keyword(s):  
Coupling Reaction ◽  
Ring Size ◽  
Chiroptical Properties ◽  
Circularly Polarized ◽  
Size Dependent ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence ◽  
Cyclic Oligomers

A series of cyclic oligomers with Dn symmetry (n = 2–5) based on chiral (R)/(S)-binaphthyl exhibiting intensive chiroptical properties were synthesized by using a Ni(0)-catalyzed coupling reaction.

Voltammetric behavior of HeLa cells on a carbon nanotube/ionic liquid modified electrode for cytotoxicity evaluation of chlorophenols

2016 ◽  
Vol 8 (1) ◽  
pp. 171-176 ◽  
Author(s):  
Xiaolin Zhu ◽  
Hongwei Qin ◽  
Guanlan Wu ◽  
Jinlian Li ◽  
Xing Yuan ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Carbon Nanotube ◽  
Modified Electrode ◽  
Cervical Carcinoma ◽  
Hela Cells ◽  
Electrochemical Method ◽  
Purine Metabolism ◽  
Human Cervical Carcinoma ◽  
Voltammetric Behavior

Two voltammetric signals based on the purine metabolism of human cervical carcinoma (HeLa) cells on a sensitive p-MWCNT/IL/GCE was discovered. The cytotoxicity of three chlorophenols was tested with this double-signal electrochemical method.

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