Probing Methyl Group Tunneling in [(CH₃)₂NH₂][Zn(HCOO)₃] Hybrid Perovskite Using Co²⁺ EPR.

ABSTRACT: At low temperature, methyl groups act as hindered quantum rotors exhibiting rotational quantum tunneling, which is highly sensitive to a local methyl group environment. Recently, we observed this effect using pulsed electron paramagnetic resonance (EPR) in two dimethylammonium-containing hybrid perovskites doped with paramagnetic Mn²⁺ ions. Here, we investigate the feasibility of using an alternative fast-relaxing Co²⁺ paramagnetic center to study the methyl group tunneling, and, as a model compound, we use dimethylammonium zinc formate [(CH₃)₂NH₂][Zn(HCOO)₃] hybrid perovskite. Our multifrequency (X-, Q- and W-band) EPR experiments reveal a high-spin state of the incorporated Co²⁺ center, which exhibits fast spin-

SUBMITTER: Usevicius G 

PROVIDER: S-EPMC9920925 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature