Nonlinear Optical and Ion Sensor Properties of Novel Molecules Conjugated by Click Chemistry

Abstract

The molecular structure, luminescence behavior, and electronic energy level of an organic optoelectronic materials are important parameters for its synthesis. The electro-optical properties can be changed by modifying the structure of the molecule to make the electronic energy level adjustable. In this article, a series of organic conjugated micro-molecules are successfully synthesized by linking small compound units. This metal-free [2 + 2] click chemistry process generates donor–acceptor chromophore substances with high yield, high solubility, and adjustable energy levels, which can be widely used for sensors and nonlinear optics in different fields. A-TCNE, A-TCNQ, and A-F4-TCNQ molecules are characterized comprehensively via UV-Vis-NIR spectra, 1H NMR spectra, infrared spectroscopy, and mass spectrometry. The unique nonlinear optical phenomena and powerful intra-molecular charge–transfer interactions of these new materials give them fascinating potential for application as optoelectronic materials.

Theoretical study of the high intersystem spin crossing (ISC) ability of a series of iridium complexes with low efficiency roll‐off properties

“…The ligand pdbi we used was obtained by adding phenyl and methyl by deformation of pmb (phenyl‐methyl‐benzimidazolyl), [ 8,19 ] whose symmetry was increased, and the molecular dipole moment was reduced, and then, the electron accepting ability of ligand was increased. [ 22 ] In addition, in order to enhance the lowest occupied molecular orbital (LUMO) energy level, we used a fluorine atom, which is an electron‐absorbing substituent, [ 23,24 ] to replace the hydrogen atom at the cyclometalating ring. The replacing of carbon atom by nitrogen atom can enhance the electron accepting ability of the ligand, and lower the LUMO energy level of the molecule, thus achieving a lower efficiency roll‐off.…”

π-Bridge Extension and Additive-Influenced Panchromaticity: A Synergetic Ploy for Augmenting Photovoltaic Characteristics of π-Distorted Chromophores

“…Seminal contributions in this field were made by Jen, Bosshard (1999), and Yamashita (2004). − Later in 2005, it was Diederich who elaborated the scope to diverse substrates and studied the structural influence on the reactivity as well as chemical yields . From then onward, continuing development by the same group along with others paved the way for the discovery of numerous molecular chromophores by adopting this chemistry. − As TCBD/DCNQ-containing products possess distinct photophysical, electrochemical, and structural properties, they have gained significant momentum in materials science as well as optoelectronics. − Among the different applications, the light harvesting property of TCBD/DCNQ-derived π-semiconductors has received profound interest in the area of organic photovoltaics (OPVs). − …”