Synthesis, electrochemical and spectroscopic investigations of 2,2′:4,4″-terpyridine and 2,2′:4,4″:6,2″-quaterpyridine ligands for metal complex photoelectrochemistry

1991 ◽  
Vol 69 (2) ◽  
pp. 315-321 ◽  
Author(s):  
L. Persaud ◽  
G. Barbiero
Keyword(s):  
Cyclic Voltammetry ◽  
Metal Complex ◽  
Key Words ◽  
Aldol Condensation ◽  
Electrochemical Behaviour ◽  
Condensation Reaction ◽  
Linear Sweep ◽  
Spectral Behaviour ◽  
Neutral Ligands ◽  
Electronic Spectral Behaviour

The synthesis of 2,2′:4,4″:6,2′″-quaterpyridine and 2,2′:4,4″-terpyridine was accomplished by a reverse aldol condensation reaction of the appropriate aldehyde with alkyl and pyridyl acetyls. A selective quaternization method in toluene is described. In this method the 1,1′ nitrogens survive alkylation and are free to coordinate with metals to form metal complexes. The electrochemical behaviour of the neutral ligands as well as the monoquaternized cations was established by linear sweep cyclic voltammetry. Spectroelectrochemical techniques were used to establish the electronic spectral behaviour and stability of the radicals obtained upon reduction. Key words: 2,2′:4,4″-terpyridine, quaterpyridine, selective quaternization.

On the electroreduction mechanism of halobenzenes: Detection of intermediates in reduction of monohalobenzenes

1989 ◽  
Vol 54 (4) ◽  
pp. 900-910 ◽  
Author(s):  
Juan Casado ◽  
Iluminada Gallardo
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Behaviour ◽  
Experimental Results ◽  
Disk Electrode ◽  
Rotating Ring Disk Electrode ◽  
Mercury Cathode

Experimental results from electrochemical behaviour of halobenzenes in DMF at a mercury cathode are used to discuss alternative mechanisms of reduction. Intermediates of these mechanisms, such as phenyl anion, phenylmercury radical and phenylmercury cation have been detected at the electrode by using cyclic voltammetry and a rotating ring-disk electrode.

scholarly journals Nonanal Sensor Fabrication Using Aldol Condensation Reaction Inside Alkali-Resistant Porous Glass

2021 ◽  
pp. 1-1
Author(s):  
Masato Tsujiguchi ◽  
Takashi Aitoku ◽  
Hironori Takase ◽  
Yasuko Yamada Maru
Keyword(s):  
Porous Glass ◽  
Aldol Condensation ◽  
Condensation Reaction ◽  
Sensor Fabrication

Liquid-phase aldol condensation of cyclohexanone on aluminium and iron oxides

1982 ◽  
Vol 47 (8) ◽  
pp. 2235-2245 ◽  
Author(s):  
Zdeněk Vít ◽  
Lubomír Nondek ◽  
Jaroslav Málek
Keyword(s):  
Iron Oxides ◽  
Aldol Condensation ◽  
Condensation Reaction ◽  
Complex Function ◽  
Acid Sites ◽  
Basic Site ◽  
Catalyst Poisoning ◽  
Iron Hydroxides ◽  
Transient Complex ◽  
Kinetics Of

The kinetics of the aldol condensation of cyclohexanone in decalin were investigated at 210 °C on catalysts prepared by drying and calcining the aluminium and iron hydroxides at 110-850 °C. The effect of catalyst poisoning by benzoic acid and pyridine on the course of the condensation reaction and aldol retroaldolisation was also examined. The kinetics of the cyclohexanone condensation can be described by means of Langmuir-Hinshelwood equations which are in agreement with a mechanism involving adsorption of cyclohexanone on a basic site to form a transient complex, reaction of this complex with a cyclohexanone molecule affording the aldol, the rate determining interaction of the aldol with free basic and acid sites yielding 2-(1-cyclohexen-1-yl)cyclohexanone and water and desorption of these products from the catalyst surface. The proposed kinetic model is supported by the results of catalyst poisoning. The activity of aluminium and iron oxides in the condensation of cyclohexanone is a complex function of their basicity and acidity depending strongly on the calcination temperature.

Structure of a new oligomer of glutaraldehyde produced by aldol condensation reaction

1991 ◽  
Vol 56 (2) ◽  
pp. 694-697 ◽  
Author(s):  
Toshio Tashima ◽  
Masahiro Imai ◽  
Yoshihiro Kuroda ◽  
Shigemasa Yagi ◽  
Terumichi Nakagawa
Keyword(s):  
Aldol Condensation ◽  
Condensation Reaction

scholarly journals Manufacturing Process of Polymeric Microneedle Sensors for Mass Production

Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1364
Author(s):  
Jae Yun Baek ◽  
Kyung Mook Kang ◽  
Hyeong Jun Kim ◽  
Ju Hyeon Kim ◽  
Ju Hwan Lee ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Detection ◽  
Mass Production ◽  
Interstitial Fluid ◽  
Linear Sweep Voltammetry ◽  
Sensor Surface ◽  
Linear Sweep ◽  
Thermal Compression ◽  
Stencil Mask ◽  
Sensor Fabrication

In this work, we present a fabrication process for microneedle sensors made of polylactic acid (PLA), which can be utilized for the electrochemical detection of various biomarkers in interstitial fluid. Microneedles were fabricated by the thermal compression molding of PLA into a laser machined polytetrafluoroethylene (PTFE) mold. Sensor fabrication was completed by forming working, counter, and reference electrodes on each sensor surface by Au sputtering through a stencil mask, followed by laser dicing to separate individual sensors from the substrate. The devised series of processes was designed to be suitable for mass production, where multiple microneedle sensors can be produced at once on a 4-inch wafer. The operational stability of the fabricated sensors was confirmed by linear sweep voltammetry and cyclic voltammetry at the range of working potentials of various biochemical molecules in interstitial fluid.

scholarly journals Precision Linear Sweep and Cyclic Voltammetry at Submillimolar Substrate Concentrations.

1990 ◽  
Vol 44 ◽  
pp. 932-943 ◽  
Author(s):  
Merete Folmer Nielsen ◽  
Svend Aage Laursen ◽  
Ole Hammerich ◽  
Otto Dahl ◽  
M. Nielsen ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Linear Sweep ◽  
Substrate Concentrations
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