Premium
A Highly Luminescent Tetramer from a Weakly Emitting Monomer: Acid‐ and Redox‐Controlled Multiple Complexation by Cucurbit[7]uril
Author(s) -
Bergamini Giacomo,
Fermi Andrea,
Marchini Marianna,
Locritani Mirko,
Credi Alberto,
Venturi Margherita,
Negri Fabrizia,
Ceroni Paola,
Baroncini Massimo
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201400375
Subject(s) - tetramer , monomer , protonation , chemistry , molecule , luminescence , density functional theory , redox , fluorescence , photochemistry , crystallography , absorption (acoustics) , computational chemistry , inorganic chemistry , materials science , polymer , organic chemistry , ion , physics , optoelectronics , quantum mechanics , composite material , enzyme
The tetrahedral, shape‐persistent molecule 1 4+ , containing four pyridylpyridinium units connected through a central carbon atom, exhibits unexpected photophysical properties including a substantially redshifted absorption (2350 cm −1 ) and a very strong fluorescence ( Φ em =40 %), compared with the monomer 2 + ( Φ em =0.4 %). Density functional theory calculations on the structure and spectroscopic properties of 1 4+ and 2 + show that exciton interactions, homoconjugation, and orbital nature account for the observed differences in their photophysical properties. The protonated tetramer binds four cucurbit[7]uril molecules and the host/guest interactions can be controlled by chemical (acid/base) as well as redox stimuli.
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom