An Organic Mixed-Valence Ligand for Multistate Redox-Active Coordination Networks

Abstract

The multistate redox-active/multi-interactive ligand 5,5,8,8-tetra(4-pyridyl)-2,2-(1,4-phenylene)bis-1H-perimidine (H2TPP) was designed and synthesized. H2TPP undergoes four one-electron oxidation steps, and was used for the preparation of a multistate redox-active coordination network in a solid-liquid interface reaction using molten Cd2+ salts. The multiple redox states of H2TPP were confirmed spectroscopically by stepwise four-electron oxidation. Spectroscopic analysis indicated that the mixed-valence states of the ligand are class II on the UV/Vis/NIR timescale and borderline class II/class III on the ESR timescale. (c) 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim