Improved Photostability of a Cu^I Complex by Macrocyclization of the Phenanthroline Ligands.

ABSTRACT: The development of molecular materials for conversion of solar energy into electricity and fuels is one of the most active research areas, in which the light absorber plays a key role. While copper(I)-bis(diimine) complexes [Cu^I (L)₂ ]⁺ are considered as potent substitutes for [Ru^II (bpy)₃ ]²⁺ , they exhibit limited structural integrity as ligand loss by substitution can occur. In this article, we present a new concept to stabilize copper bis(phenanthroline) complexes by macrocyclization of the ligands which are preorganized around the Cu^I ion. Using oxidative Hay acetylene homocoupling conditions, several Cu^I complexes with varying bridge length were prepared and analyzed. Absorption and emission properties are assessed; rewardingly, the envisioned approach was successful since the flexible 1,4-butadiyl-bridged complex does show enhanced MLCT absorption and emission, as well as improved photostability upon irradiation with a blue LED compared to a reference complex.

SUBMITTER: Brandl T 

PROVIDER: S-EPMC7079024 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature