Non-covalent interaction of porphyrin with Ti3CTx - spectroscopic studies

<p>A hybrid material was obtained via non-covalent coupling of meso-(p-hydroxyphenyl)porphyrin (TPPH) with Ti₃C₂Tₓ MXene nanosheets. Comprehensive spectroscopic characterization (UV–vis, FTIR, Raman, steady-state and time-resolved fluorescence, transient absorption) confirmed strong electronic interactions and formation of a ground-state complex, evidenced by a 40 nm red shift of the Soret band. Emission studies revealed purely static quenching, while femtosecond transient absorption demonstrated ultrafast photoinduced electron transfer from singlet excited TPPH to MXene with formation of a porphyrin radical cation. The hybrid also showed improved ambient stability compared to pristine MXene.</p>