Scientific article
English

Large π-Conjugated Chromophores Derived from Tetrathiafulvalene

Published inAsian journal of organic chemistry, vol. 3, no. 2, p. 198-202
Publication date2014
Abstract

A large pi-conjugated chromophore composed of two dipyrido[3,2-a:2',3'-c]phenazine (dppz) units directly fused to the central tetrathiafulvalene (TTF) core, has been prepared as a bridging ligand, and its strong binding ability to Ru2+ forming a new dinuclear complex is presented. The electronic absorption and luminescence and the electrochemical behaviour of the free ligand as well as the Ru2+ complex have been investigated in detail. The free ligand shows a very strong band in the UV region consistent with ligand centred π-π* transitions and an intense broad band in the visible region corresponding to an intramolecular charge transfer (ILCT) transition. Upon coordination, a metal-to-ligand charge transfer (MLCT) appears at 22520 cm-1 while the ILCT band is bathochromically shifted by 1620 cm-1. These electrochemically amphoteric chromophores have also been characterized by spectroelectrochemical methods. The oxidized radical species of the free ligand show a strong tendency to undergo aggregation, in which long-distance attractive interactions overcome the electrostatic repulsion. Moreover, these two new chromophores reveal an ILCT fluorescence with large solvent-dependent Stokes shifts and quantum efficiencies of 0.052 for the free ligand and 0.016 for its dinuclear Ru2+ complex in CH2Cl2.

Keywords
  • Dipyrido[3,2-a:2′,3′-c]phenazines
  • Photophysics
  • Redox chemistry
  • Ruthenium
  • Tetrathiafulvalenes
Research groups
Citation (ISO format)
JIA, Hongpeng et al. Large π-Conjugated Chromophores Derived from Tetrathiafulvalene. In: Asian journal of organic chemistry, 2014, vol. 3, n° 2, p. 198–202. doi: 10.1002/ajoc.201300144
Main files (1)
Article (Published version)
accessLevelRestricted
Identifiers
Journal ISSN2193-5807
712views
0downloads

Technical informations

Creation21/02/2014 11:17:00
First validation21/02/2014 11:17:00
Update time14/03/2023 21:59:16
Status update14/03/2023 21:59:16
Last indexation30/10/2024 17:21:40
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack