A number of linear coordination polymers have been assembled from lanthanide cations (Ln
3+) and cucurbit[7]uril (Q[7]) in the presence of [CuCl
4]
2−or [CoCl
4]
2− anions acting as inorganic structure inducers in HCl solution. X-ray diffraction analysis
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A number of linear coordination polymers have been assembled from lanthanide cations (Ln
3+) and cucurbit[7]uril (Q[7]) in the presence of [CuCl
4]
2−or [CoCl
4]
2− anions acting as inorganic structure inducers in HCl solution. X-ray diffraction analysis has revealed that they form three groups of isomorphous structures. Generally, the complexes of Q[7] with light lanthanide cations (those with atomic number below that of neodymium (Nd
3+)) are in one group. The other two groups, in which the lanthanide cation has atomic number greater than that of europium (Eu
3+), seem to follow no obvious rule. For example, the complexes of Q[7] with Eu
3+ and Gd
3+cations are in the second group in the presence of [CuCl
4]
2− anions, while they are in the third group in the presence of [CoCl
4]
2− anions. However, whatever group a given complex belongs to, they all show a common honeycomb-patterned supramolecular assembly, in which [CuCl
4]
2−or [CoCl
4]
2− anions form a honeycomb structure. The Ln
3+ cations then coordinate to neighboring Q[7] molecules to form 1D coordination polymers that are inserted into the channels of the honeycomb framework, such that each individual coordination polymer is surrounded by [CuCl
4]
2−or [CoCl
4]
2− anions.
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