Donor-Acceptor Conjugated Linear Polyenes: A Study of Excited State Intramolecular Charge Transfer, Photoisomerization and Fluorescence Probe Properties

Abstract

Numerous studies of donor-acceptor conjugated linear polyenes have been carried out with the goal to understand the exact nature of the excited state electronic structure and dynamics. In this article we discuss our endeavours with regard to the excited state intramolecular charge transfer, photoisomerization and fluorescence probe properties of various donor-acceptor substituted compounds of diphenylpolyene [Ar(CH = CH) Ar] series and ethenylindoles.

Pd(ii)/Lewis acid catalyzed regioselective olefination of indole with dioxygen

“…In fact, electron-rich vinylindoles have already attracted much attention because of their potential applications as anticancer agents, ROS cleaners and fluorescent probes for biosystems, thus demonstrating their value in biomedicines. 39–42 Herein, we report a Pd( ii )/LA catalyzed indole olefination reaction with electron-rich olefins, and the olefination proceeded smoothly at the C-3 position of the indole through N -carboxamide directed remote C–H activation, with dioxygen as the sole oxidant (Scheme 1d).…”

Quantitative Accuracy in Calculating Charge Transfer State Energies in Solvated Molecular Complexes Using a Screened Range Separated Hybrid Functional within a Polarized Continuum Model

“…Photoinduced charge transfer (CT) processes are central to a wide range of optoelectronics applications − and to the functionality of biological systems. , Recent advances in spectral characterization of both natural and artificial systems highlight their critical role in light harvesting functionality. − Natural photosynthesis involves a sequence of CT and transport steps through an array of pigments following exciton generation and transfer. − In organic photovoltaic applications, interfacial CT processes lead to charge separation and collection of charge carriers. − In either scenario CT is key for the overall functionality and is known to be strongly affected by the molecular interface of the donor and acceptor groups. − CT states are typically associated with a large dipole across the coupled donor and acceptor of the transferred charge. The dipole leads to the strong dependence of CT states on the relative position of the donor and acceptor subsystems and on the electrostatic environment. , In this paper we report a new framework for calculating CT states that accounts effectively for the electrostatic environment.…”

Coumarin Based Hydrazone as an Antioxidant and Sensor for Cupric Ion: Spectroscopic and Computational Studies

“…Such type of moderate variation in absorption properties is also shown in molecule with weak electron donor-electron acceptor or weak electron donor-donor substituents due to electron excitation from its singlet ground state to its locally singlet excited state of the molecule. [31][32][33][34] The sensing properties of CH are evaluated towards seven transition metal ions, Cr 3 + , Mn 2 + , Fe 3 + , Co 2 + , Ni 2 + , Cu 2 + and Zn 2 + . For this purpose, the absorbance of CH at 319 nm is measured in the presence and absence of metal ions at varied metal ion concentration.…”