Computational investigation of a new ion-pair receptor for calix[4]pyrrole

Journal of Molecular Modeling - Tập 18 - Trang 2291-2299 - 2011
Yong Xia1, Xueye Wang1, Yu Zhang1, Benhua Luo1, Yi Liu1
1Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, People’s Republic of China

Tóm tắt

Theoretical studies of a new ion-pair receptor, meso-octamethylcalix[4]pyrrole (OMCP), and its interactions with the halide anions F−, Cl−, and Br− and the cesium halides CsF, CsCl, and CsBr have been performed. Geometries, binding energies, and binding enthalpies were evaluated with the restricted hybrid Becke three-parameter exchange functional (B3LYP) method using the 6-31+G(d) basis set and relativistic effective core potentials. The optimized geometric structures were used to perform natural bond orbital (NBO) analysis. The two typical types of hydrogen bonds, N–H…X− and C–H…X−, were investigated. The results indicate that hydrogen bonding interactions are dominant, and that the halide anions (F−, Cl−, and Br−) offer lone pair electrons to the σ*(N–H) or σ*(C–H) antibonding orbitals of OMCP. In addition, electrostatic interactions between the lone pair electrons of the halide anion and the LP* orbitals of Cs+ as well as cation–π interactions between the metal ion and π-orbitals of the pyrrole rings have important roles to play in the Cs+•OMCP•X− complexes. The current study further demonstrates that this easy-to-make OMCP host compound functions as not only an anion receptor but also an ion-pair receptor.

Tài liệu tham khảo

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