Abstract
An allosteric system 1 was constructed by introducing a linear conjugated chain at position 1 and two side chains at positions 2 and 6 on the benzene ring. The conjugated chain consists of a zinc diethynyldiphenylporphyrin center (ZnDEDPP) extended to a diamidopyridine terminal. The side arm has a zinc tetraphenylporphyrin terminal (ZnTPP) linked by flexible ethylenedioxy groups. The organic effector 2, possessing a uracil and two pyridine units, formed a tight 1:1 supramolecular complex with 1. The binding constant of ZnDEDPP in 1 with 4-phenylpyridine was 4.2 times larger than that of ZnDEDPP in 1·2, indicating that compound 2 functions as an allosteric effector for the complexation of 1 and 4-phenylpyridine.
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