Paraquat Substituent Effect on Complexation with a Dibenzo-24-crown-8-Based Cryptand
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https://figshare.com/articles/dataset/Paraquat_Substituent_Effect_on_Complexation_with_a_Dibenzo_24_crown_8_Based_Cryptand/2975866
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资源简介：
Dibenzo-24-crown-8-based cryptand 4 forms 1:1 inclusion
complexes with three paraquat derivatives, P1, P2, and P3,
as demonstrated by proton NMR spectroscopy and X-ray
analysis. However, it was found that methyl-substituted
paraquat derivatives, P2 and P3, can bind cryptand 4 more
strongly than non-methyl-substituted paraquat derivative P1.
The association constants (Ka) were determined in acetone
by using a UV−vis titration method to be 5.0 × 103 M-1
for 4·P1, 1.0 × 105 M-1 for 4·P2, and 1.2 × 105 M-1 for
4·P3, respectively. In the solid state, 4·P2 and 4·P3 have
similar T-type inclusion complexation conformations, which
are very different from the pseudorotaxane-type complexation
conformation of 4·P1. Theoretical calculations were done
to explain these experimental results.
创建时间：
2016-02-28
