Abstract
A novel porphyrin-salen compound and corresponding zinc(II) porphyrin-salen compound (ZnPSC10) covalently linked by a flexible alkoxy chain (–O(CH)10O–) have been synthesized and characterized. Molecular recognition of three N-heterocyclic guests, pyridine, 1,4-diazobycyclo[2,2,2]octane (DABCO) and pyrazine, with the host ZnPSC10 was investigated. Binding constants were determined by means of UV-vis titration method. The binding mode of ZnPSC10 with DABCO has been discussed in detail by using 1H NMR. It was found that the conformations of the recognition system changed from closed to open with the adding of DABCO.
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