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Exciton‐Coupled Circular Dichroism Characterization of Monotopically Binding Guests in Host−Guest Complexes with a Bis(zinc porphyrin) Tweezer
Author(s) -
Olsson Sandra,
Schäfer Clara,
Blom Magnus,
Gogoll Adolf
Publication year - 2018
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201800564
Subject(s) - chemistry , circular dichroism , amine gas treating , porphyrin , molecule , exciton , crystallography , non covalent interactions , photochemistry , organic chemistry , hydrogen bond , physics , quantum mechanics
A stiff‐stilbene‐linked bisporphyrin tweezer with inherent helicity was used for exciton‐coupled circular dichroism (ECCD) characterization of a series of monotopically binding amine guest molecules. CD signals were observed for a variety of monoamines at relatively low tweezer/amine (host/guest) ratios between 1 : 10 to 1 : 70. For the amines producing the most intense CD signals, a binding stoichiometry of 1 : 2 was found. A likely explanation is the presence of guest‐guest interactions in the complexes. This is supported by the correlation observed between CD signal intensity and magnitude of possible noncovalent binding between the guests, which can be divided into three groups showing no, moderate and strong response, respectively. Further support for this rationalization comes from molecular modelling.