The UV-vis absorption properties of undoped and doped 1,4-phenylenemethylidynenitrilo-1,4-phenylenenitrilomethylidyne (PAZ) in various temperatures are reported. It is demonstrated that the absorption spectra can be modified not only by changing the temperature from 193K to 413K, but also via acid-base doping involving the protonation of nitrogen atom in imine group. The use of special protonating agent, i.e. 1,2-(di-2-ethylhexyl)ester of 4-sulfophthalic acid (PSA) lead to the modification of the absorption spectrum of the PAZ. The imine band in UV-vis spectrum of the doped with the PSA polyazomethine is 85 nm red shifts in comparison with unprotonated one. The thermochromism of PAZ included the conformational changes in the conjugating backbone structure of the undoped and doped polyazomethine.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.saa.2009.06.005 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Insights into the Spectral Characteristics and Sources of Dissolved Organic Matter in a Water Supply Reservoir.
Bull Environ Contam Toxicol
January 2025
School of Mathematics and Physics, Xi'an Jiaotong-Liverpool University, Suzhou, Jiangsu, 215123, China.
This study focuses on the composition and sources of dissolved organic matter (DOM) in the Fancun Reservoir, located in Ningguo City, Anhui Province, China. The investigation was conducted by analyzing the spectral characteristics of DOM using UV-Vis absorption spectra and fluorescence spectroscopy. The humic substances were dominated by fulvic acid, with an average DOM concentration of 30.
View Article and Find Full Text PDFUnveiling with Density Functional Theory the Optical Property Variations of Three Kinds of Graphene for Acetaminophen Sensor Design.
ACS Omega
January 2025
Instituto de Física, Universidad Nacional Autónoma de México, código postal 04510, Mexico City 01000, Mexico.
Understanding the interactions between molecules and sensing elements is crucial to improving sensors. We present one step toward getting closer to the breach between theory and empirical sensor development. Through density functional theory (DFT) calculations, we explored the changes in some optical properties of pristine graphene (G), graphene oxide (GO), and reduced graphene oxide (rGO) interacting with one molecule of acetaminophen (APAP).
View Article and Find Full Text PDFFor Omphalotus japonicus, the coloring molecule was found and characterized using a simple method of identification with a color reaction. The compound that chang color under basic conditions was isolated from a methanolic extract of O. japonicus by liquid-liquid extraction.
View Article and Find Full Text PDFAbsorption, Steady-State Fluorescence and Solvent Effect Studies of Fluorescent Haloarchaeal Bacterioruberin.
J Fluoresc
January 2025
Central Research Laboratory, Kastamonu University, 37200, Kastamonu, Turkey.
Fluorescence characterization of halophilic archaeal C50 carotenoid-bacterioruberin extracts was investigated using UV/Vis and steady-state fluorescence spectrophotometry in solvents with different polarity. Different extracts showed maximum absorption and fluorescence wavelengths between 369-536 nm and 540-569 nm. Stokes' shifts varied between 50-79 nm depending on the solvent.
View Article and Find Full Text PDFThree-Dimensional SERS-Active Hydrogel Microbeads Enable Highly Sensitive Homogeneous Phase Detection of Alkaline Phosphatase in Biosystems.
ACS Appl Mater Interfaces
January 2025
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
Alkaline phosphatase (ALP) is a biomarker for many diseases, and monitoring its activity level is important for disease diagnosis and treatment. In this study, we used the microdroplet technology combined with an laser-induced polymerization method to prepare the Ag nanoparticle (AgNP) doped hydrogel microbeads (HMBs) with adjustable pore sizes that allow small molecules to enter while blocking large molecules. The AgNPs embedded in the hydrogel microspheres can provide SERS activity, improving the SERS signal of small molecules that diffuse to the AgNPs.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!