Assembly principles and relaxation processes in nanosized heterogeneous complexes: Multiporphyrin structures and CdSе/ZnS nanocrystals

Abstract

Based on the extra-ligand addition effect, the principles of targeted self-assembly of nanosized multiporphyrin complexes of various types with controllable geometry and composition (up to 8 tetrapyrroles) and heterogeneous composites based on trioctylphosphine oxide-stabilized CdSe/ZnS semiconductor nanocrystals and organic compounds were developed. The dynamics and mechanisms of energy and charge transfer (including electron tunneling) in such systems were studied by continuous, picosecond fluorescence (∆½ ≈ 30 ps), and femtosecond transient (∆½ ≈ 120 fs) spectroscopy with varying the quantitative and qualitative constitution of the composites, the temperature, and the polarity of the medium.