A ratiometric solvent polarity sensing Schiff base molecule for estimating the interfacial polarity of versatile amphiphilic self-assemblies

The Analyst ◽  
2016 ◽  
Vol 141 (11) ◽  
pp. 3246-3250 ◽  
Author(s):  
Rini Majumder ◽  
Yeasmin Sarkar ◽  
Sanju Das ◽  
Suresh K. Jewrajka ◽  
Ambarish Ray ◽  
...  
Keyword(s):  
Schiff Base ◽  
Detection Method ◽  
Solvent Polarity ◽  
First Time ◽  
Interfacial Polarity

A simple interfacial polarity detection method for versatile self-assemblies is introduced for the first time by exploiting the polarity induced interconversion between nonionic and zwitterionic forms of Schiff base molecule (PMP).

Facile template synthesis of water-soluble triazine-based Schiff base ligand bridged-coordination polymers of Co(ii), Ni(ii), and Cu(ii): structure, biomolecular interactions, and cytotoxic activity

2019 ◽  
Vol 43 (34) ◽  
pp. 13371-13380 ◽  
Author(s):  
Sheikdawood Parveen ◽  
Thathan Premkumar ◽  
Hung Huy Nguyen ◽  
Subbiah Govindarajan
Keyword(s):  
Schiff Base ◽  
Cytotoxic Activity ◽  
Coordination Polymers ◽  
Schiff Base Ligand ◽  
Template Synthesis ◽  
Water Soluble ◽  
Biomolecular Interactions ◽  
First Time ◽  
Ct Dna

For the first time, a new hydrazone Schiff base ligand and its Co(ii), Ni(ii), and Cu(ii) complexes were synthesised and characterised. Their antioxidant and binding activities towards CT-DNA and BSA were evaluated.

Tuning the fluorescence behavior of liquid crystal molecules containing Schiff-base: Effect of solvent polarity

2019 ◽  
Vol 210 ◽  
pp. 371-375 ◽  
Author(s):  
Ashok K. Satapathy ◽  
Santosh K. Behera ◽  
Ankit Yadav ◽  
Laxmi Narayan Mahour ◽  
C.V. Yelamaggad ◽  
...  
Keyword(s):  
Schiff Base ◽  
Liquid Crystal ◽  
Solvent Polarity ◽  
Effect Of Solvent

scholarly journals Constructing covalent organic frameworks in waterviadynamic covalent bonding

IUCrJ ◽  
2016 ◽  
Vol 3 (6) ◽  
pp. 402-407 ◽  
Author(s):  
Jayshri Thote ◽  
Harshitha Barike Aiyappa ◽  
Raya Rahul Kumar ◽  
Sharath Kandambeth ◽  
Bishnu P. Biswal ◽  
...  
Keyword(s):  
Schiff Base ◽  
Covalent Bonding ◽  
Porous Polymers ◽  
Porous Structures ◽  
Covalent Organic Frameworks ◽  
Synthetic Route ◽  
Dynamic Covalent Chemistry ◽  
Water Based ◽  
First Time ◽  
Reaction In Water

The formation of keto-enamine based crystalline, porous polymers in water is investigated for the first time. Facile access to the Schiff base reaction in water has been exploited to synthesize stable porous structures using the principles of Dynamic Covalent Chemistry (DCC). Most credibly, the water-based Covalent Organic Frameworks (COFs) possess chemical as well as physical properties such as crystallinity, surface area and porosity, which is comparable to their solvothermal counterparts. The formation of COFs in water is further investigated by understanding the nature of the monomers formed using hydroxy and non-hydroxy analogues of the aldehyde. This synthetic route paves a new way to synthesize COFs using a viable, greener route by utilization of the DCC principles in conjunction with the keto–enol tautomerism to synthesize useful, stable and porous COFs in water.

Lewis basicity of relevant monoanions in a non-protogenic organic solvent using a zinc(ii) Schiff-base complex as a reference Lewis acid

2017 ◽  
Vol 46 (35) ◽  
pp. 11608-11614 ◽  
Author(s):  
Ivan Pietro Oliveri ◽  
Santo Di Bella
Keyword(s):  
Schiff Base ◽  
Organic Solvent ◽  
Lewis Acid ◽  
Schiff Base Complex ◽  
Base Complex ◽  
First Time

The Lewis basicity of relevant anions is reported for the first time and compared with that of neutral bases.

scholarly journals Study of the hydrolysis and ionization constants of Schiff base from pyridoxal 5′-phosphate and n-hexylamine in partially aqueous solvents. An application to phosphorylase b

1986 ◽  
Vol 238 (1) ◽  
pp. 137-144 ◽  
Author(s):  
J Donoso ◽  
F Muñoz ◽  
A García Del Vado ◽  
G Echevarría ◽  
F García Blanco
Keyword(s):  
Schiff Base ◽  
Nitrogen Atom ◽  
Ph Value ◽  
Equilibrium Constants ◽  
Solvent Polarity ◽  
Hydrolysis Rate ◽  
Ionization Constants ◽  
Pyridine Nitrogen Atom ◽  
Pyridine Nitrogen ◽  
Pka Value

Formation and hydrolysis rate constants as well as equilibrium constants of the Schiff base derived from pyridoxal 5′-phosphate and n-hexylamine were determined between pH 3.5 and 7.5 in ethanol/water mixtures (3:17, v/v, and 49:1, v/v). The results indicate that solvent polarity scarcely alters the values of these constants but that they are dependent on the pH. Spectrophotometric titration of this Schiff base was also carried out. We found that a pKa value of 6.1, attributed in high-polarity media to protonation of the pyridine nitrogen atom, is independent of solvent polarity, whereas the pKa of the monoprotonated form of the imine falls from 12.5 in ethanol/water (3:17) to 11.3 in ethanol/water (49:1). Fitting of the experimental results for the hydrolysis to a theoretical model indicates the existence of a group with a pKa value of 6.1 that is crucial in the variation of kinetic constant of hydrolysis with pH. Studies of the reactivity of the coenzyme (pyridoxal 5′-phosphate) of glycogen phosphorylase b with hydroxylamine show that this reaction only occurs when the pH value of solution is below 6.5 and the hydrolysis of imine bond has started. We propose that the decrease in activity of phosphorylase b when the pH value is less than 6.2 must be caused by the cleavage of enzyme-coenzyme binding and that this may be related with protonation of the pyridine nitrogen atom of pyridoxal 5′-phosphate.

scholarly journals Weed Density Detection Method Based on Absolute Feature Corner Points in Field

Agronomy ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 113
Author(s):  
Yanlei Xu ◽  
Run He ◽  
Zongmei Gao ◽  
Chenxiao Li ◽  
Yuting Zhai ◽  
...  
Keyword(s):  
Weed Management ◽  
Detection Method ◽  
Digital Camera ◽  
Weed Detection ◽  
Position Information ◽  
Weed Density ◽  
Harris Corner ◽  
Weed Distribution ◽  
First Time ◽  
Precision Spraying

Field weeds identification is challenging for precision spraying, i.e., the automation identification of the weeds from the crops. For rapidly obtaining weed distribution in field, this study developed a weed density detection method based on absolute feature corner point (AFCP) algorithm for the first time. For optimizing the AFCP algorithm, image preprocessing was firstly performed through a sub-module processing capable of segmenting and optimizing the field images. The AFCP algorithm improved Harris corner to extract corners of single crop and weed and then sub-absolute corner classifier as well as absolute corner classifier were proposed for absolute corners detection of crop rows. Then, the AFCP algorithm merged absolute corners to identify crop and weed position information. Meanwhile, the weed distribution was obtained based on two weed density parameters (weed pressure and cluster rate). At last, the AFCP algorithm was validated based on the images that were obtained using one typical digital camera mounted on the tractor in field. The results showed that the proposed weed detection method manifested well given its ability to process an image of 2748 × 576 pixels using 782 ms as well as its accuracy in identifying weeds reaching 90.3%. Such results indicated that the weed detection method based on AFCP algorithm met the requirements of practical weed management in field, including the real-time images computation processing and accuracy, which provided the theoretical base for the precision spraying operations.

scholarly journals Molecular detection of bovine hemotrophic mycoplasmas in Mexico

2020 ◽  
Vol 13 (52) ◽  
pp. 67-82
Author(s):  
Rosa Estela Quiroz Castañeda ◽  
Kytzya Mejía Aragón ◽  
Hugo Aguilar Diaz ◽  
Jesús Francisco Preciado de la Torre
Keyword(s):  
Molecular Detection ◽  
Detection Method ◽  
Animal Health ◽  
Clinical Signs ◽  
Health Condition ◽  
Duplex Pcr ◽  
Blood Samples ◽  
End Point ◽  
Mycoplasma Wenyonii ◽  
First Time

The presence of hemoplasmas Candidatus Mycoplasma haemobos and Mycoplasma wenyonii that infect bovine cattle has been reported during the last years. Hemoplasmas may affect animal health either alone or in coinfections with other microorganisms, resulting in anemia and other clinical signs. In Mexico, only Ca. M. haemobos has been detected in cattle; in this work, we report for the first time in our country the presence of M. wenyonii in animals from different geographical sources amd we detected both hemoplasmas by duplex PCR. Also, by single end-point PCR, we found Ca. M. haemobos and M. wenyonii in 96% and 96.29% of the blood samples, respectively. Both hemoplasmas were detected in 50% of the samples analyzed, which suggest that the duplex PCR developed in this work might improve if some modifications are performed. This molecular detection method will provide valuable information to know the health condition of national cattle to prevent pathogen dispersion.

Discotic liquid crystals of transition metal complexes 34: spectroscopic properties of bis[octakis(3,4-dialkoxy-phenoxy)phthalocyaninato]lutetium(III) complexes

2003 ◽  
Vol 07 (02) ◽  
pp. 105-111 ◽  
Author(s):  
Kazuaki Hatsusaka ◽  
Kazuchika Ohta
Keyword(s):  
Thin Film ◽  
Absorption Spectra ◽  
Electronic Absorption ◽  
Liquid Crystalline ◽  
Electronic Absorption Spectra ◽  
Solvent Polarity ◽  
Spectroscopic Properties ◽  
Temperature Dependent ◽  
First Time ◽  
Hexane Solution

Spectroscopic properties of discotic liquid crystalline bis[octakis(3,4-dialkoxyphenoxy)-phthalocyaninato]lutetium(III) complexes, {[( C n O )2 PhO ]8 Pc }2 Lu (n = 12: 2a and n = 13: 2b), were investigated by recording electronic absorption spectra in the region of 250-2600 nm under three different conditions; solution, mixed solvent solutions, and a thin film at various temperatures. An intermolecular charge transfer (CT) band was found at about 2000-2100 nm both for the n-hexane solution and the thin film. It was established for the first time from the solvent-polarity-dependent and temperature-dependent electronic absorption spectra that the intermolecular CT band is attributable to molecular aggregation.

Detection and Characterization of Corrosion Under Coatings

2014 ◽  
Author(s):  
Robert J. Stakenborghs ◽  
Ryan M. Goitia
Keyword(s):  
Early Detection ◽  
Annual Cost ◽  
Detection Method ◽  
Microwave Method ◽  
New Developments ◽  
Corrosion Detection ◽  
The Us ◽  
First Time

The annual cost of corrosion to industry exceeded the trillion dollar mark in the US for the first time. This huge cost has led to the need for new developments in corrosion detection. Early detection of corrosion can lead to substantial savings if the corrosion can be abated once detected. Until recently, coatings have hindered the detection of corrosion. This paper describes a microwave method for detecting corrosion under coatings. The paper describes the detection method and provides examples of detection sensitivities and limits.

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