Related Experiment Video
Updated: Jun 25, 2026
![[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)
[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
Published on: May 21, 2019
Multiparametric evaluation of structure-photophysical activity correlation: A case study of pyrene-tethered chalcone
Moumin Husain Dar1, Syed Andleeb Ishaq1, Parvaiz Ahmad Dar1
1Department of Chemistry, University of Kashmir, Hazratbal, Srinagar, Jammu and Kashmir-190006, India.
Abstract:
Molecular structures with unique functionalities show interesting photophysical properties. The structure-photophysical activity correlation of synthesized pyrene tethered chalcone (PTC) molecule was envisaged from its solvatochromic shift in 14 solvents of nonpolar, polar-protic and polar-aprotic nature. Analysis of PTC solvatochromism using the Taft and Catalan models indicates an increase in the excited state dipole moment. PTC molecule has a carbonyl group and pyridine nitrogen as electronically distinct regions of Lewis acid base behavior and pH sensitivity. A complete quenching of fluorescence intensity of PTC was observed on exposure to HCl fumes, concomitant with orange-to-black color change which upon exposure to NH3 vapors was reversed, corroborating reversible vapochromism. Computational studies of FMO and ESP analysis indicate an intramolecular charge transfer and Lewis acid base reactivity as underlying mechanisms of observed photophysical properties and vapochromism, respectively.
More Related Videos
14:11Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
Published on: June 10, 2021
10:21Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
Published on: October 5, 2019
Related Concept Videos
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
Aromatic Hydrocarbon Cations: Structural Overview
Removing one hydrogen from the intervening CH2 group with both...
Variables Affecting Phosphorescence and Fluorescence
UV–Vis Spectroscopy: Woodward–Fieser Rules
UV–Vis Spectroscopy of Conjugated Systems
One of the factors influencing λmax is the extent of conjugation in the...
Thermal Electrocyclic Reactions: Stereochemistry
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.