科研之友
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摘要
The reactions of lanthanide nitrates with 5-nitroisophthalic acid (ab. 5-H(2)nip) in DMF and ethanol (1 : 1) mixed solution gave rise to three nanoporous lanthanide polymers, {[Ln(2)(5-nip)(3)(DMF)(4)](DMF)(2)}(n) (Ln = Nd (1), Dy (2), Ho (3), 5-nip = 5-nitroisophthalate). Single-crystal X-ray diffraction analyses reveal that they are isomorphous and feature three-dimensional metal-organic frameworks with two-dimensional intersecting channels occupied by guest DMF molecules constructed from the linkage of dimer Ln(2)C(6)O(12) SBUs and 5-nip ligands. The guest DMF molecules can be reversibly removed from 2 as identified using TGA-DSC and PXRD. The heat of adsorption of the guest-free sample of 2 with DMF was measured with a value of 10.3 kJ mol(-1) by an RD496-III type microcalorimeter. In addition, the photoluminescent property of 2 was investigated.
