The organic bridging ligand H2CPQC provides a higher chelating site density along the crystal axis direction, and the significant difference in the axial and radial chelation site densities makes the crystal tend to epitaxially grow along the axial direction in the growth solution with less H+. In addition, the introduction of the substrate prevents the one end face of the ZJU-68 crystal attached to the substrate from contacting the framework-building elements; thus, the epitaxial growth of the crystal has unidirectionality, and finally, uniaxially homoepitaxially grown (UHG) ZJU-68 crystals are obtained
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