Atomically Precise Distorted Nanographenes: The Effect of Different Edge Functionalization on the Photophysical Properties down to the Femtosecond Scale
Metadatos
Mostrar el registro completo del ítemEditorial
MDPI
Materia
Atomically precise nanographenes Fluorescent nanomaterials Distorted hexa-perihexabenzocoronene derivatives Optical properties
Fecha
2023-01-15Referencia bibliográfica
Reale, M... [et al.]. Atomically Precise Distorted Nanographenes: The Effect of Different Edge Functionalization on the Photophysical Properties down to the Femtosecond Scale. Materials 2023, 16, 835. [https://doi.org/10.3390/ma16020835]
Patrocinador
European Research Council (ERC) 677023; MCIN/AEI PID2021-127521NB-I00; ERDF A way of making Europe; Consejeria de Transformacion Economica, Industria, Conocimiento y Universidades de la Junta de Andalucia POSTDOC_21_00139Resumen
Nanographenes (NGs) have been attracting widespread interest since they combine peculiar
properties of graphene with molecular features, such as bright visible photoluminescence. However,
our understanding of the fundamental properties of NGs is still hampered by the high degree of
heterogeneity usually characterizing most of these materials. In this context, NGs obtained by
atomically precise synthesis routes represent optimal benchmarks to unambiguously relate their
properties to well-defined structures. Here we investigate in deep detail the optical response of three
curved hexa-peri-hexabenzocoronene (HBC) derivatives obtained by atomically precise synthesis
routes. They are constituted by the same graphenic core, characterized by the presence of a heptagon
ring determining a saddle distortion of their sp2 network, and differ from each other for slightly
different edge functionalization. The quite similar structure allows for performing a direct comparison
of their spectroscopic features, from steady-state down to the femtosecond scale, and precisely
disentangling the role played by the different edge chemistry.