Helical Induction, Chiroptical Properties, and Quantitative Prediction of the Dissymmetry Factor on the Circularly Polarized Phosphorescence of Iminopyrrolyl Platinum(II) Complexes

• Published in: Chemistry of materials Vol. 34; no. 17; pp. 7959 - 7970
• Main Authors: Inoue, Ryo, Kondo, Riki, Morisaki, Yasuhiro
• Format: Journal Article
• Language: English
• Published: American Chemical Society 13.09.2022
• ISSN: 0897-4756; 1520-5002
• DOI: 10.1021/acs.chemmater.2c01817

Chiral transition metal complexes have attracted significant attention for the development of optoelectrical materials, such as circularly polarized phosphorescence (CPP)-emitting devices. In this paper, we report the helicity induction of d-π-conjugated platinum­(II) complexes by the point chirality on 1,2-diaminocyclohexane and their CPP properties. The obtained C2-helical complexes exhibited excellent chiroptical properties with high dissymmetry factors (circular dichroism: g abs = 1.2 × 10–2, CPP: g phos = 3.2 × 10–3). Moreover, we conducted a theoretical investigation of the dissymmetry factor of CPP, g phos,calc, using a kinetic model of triplet state sublevels. The ab initio calculations represented the experimental g phos values, as well as the impact of helical chirality on the CPP.