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Alkali cations (A+ = Na+, K+, Rb+, Cs+) were coordinated with 1,2,3-hexamethylcucurbit[5]uril (1,2,3-HMeQ[5]) using different structure directing agents. Single crystal X-ray diffraction revealed the formation of heterometallic molecular capsule-like complexes in the presence of [CdCl4]2− anions as a structure directing agent. One portal of the 1,2,3-HMeQ[5] molecule is covered by a Cd2+ cation, while the other portal is covered by a A+ cation, and a chloride anion occupies the cavity of the Q[5] molecule. In contrast, in the presence of p-nitrophenol, a molecular bowl-like complex is formed, in which only one portal is covered by an A+ cation, and a water molecule occupies the cavity of the Q[5] molecule. The comparative study of these complexes suggest that the structure directing agents play important roles in the self-assembly of coordination complexes. |
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