Related Experiment Video
Updated: Dec 30, 2025

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
Published on: November 22, 2016
Anchoring a Sulfonate Group to an Electron-Transporting Molecule by an Alkyl Chain and Its Use as the Counter Anion
Pei Wang1, Ningzi Luo1, Xiangzhi Song1
1College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, P. R. China.
Abstract:
An electron-transporting anion prepared by anchoring a sulfonate group onto an electron-transporting molecule through a flexible alkyl chain and its use as the counter anion in a cationic iridium complex is reported. The flexible alkyl chain improves the solubility of the bulky anion in water or in polar organic solvents. The anion exhibits similar photophysical and electrochemical properties to the parent electron-transporting molecule. Within the complex, the anion does not disturb the phosphorescence of the cation in the solid film. Solution-processed small-molecule organic light-emitting diodes (OLEDs) using the complex as the dopant show superior performances over the reference device using the conventional complex with a PF6 - counter anion. It is revealed that anchoring anionic groups to optoelectronically active molecules with flexible alkyl chains is a feasible approach to develop optoelectronically active anions for assembling ion pairs with advanced optoelectronic properties.
Related Concept Videos
Metal-Ligand Bonds
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Formation of Complex Ions
Complexation Equilibria: The Chelate Effect
EDTA: Chemistry and Properties
Ionic Bonding and Electron Transfer
Structure and Nomenclature of Thiols and Sulfides

