부산대학교 도서관

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. Tweezer with a twist: A bis(zinc porphyrin) tweezer was used to produce strong to moderate exciton‐coupled circular dichroism (ECCD) signals with monotopically binding monoamine guest molecules (see figure). The stiff‐stilbene linker induces inherent helicity of the tweezer, which in free form exists as a racemate. For host‐guest complexes, the CD signals reach their maximum amplitude at relatively low host‐guest ratios ranging from 1 : 10 to 1 : 70. [ABSTRACT FROM AUTHOR]