Microporous Rare Earth Coordination Polymers Constructed by a Flexible Pimelic Acid Ligand

Abstract

Abstract: Three new rare earth coordination polymers of pimelic acid (H₂pim), [Nd(Hpim)(pim)(H₂O)] ·2H₂O(1) and [RE ₂(pim)₃(H₂O)] ·H₂O [RE=Er(2), RE=Ho(3)] , were synthesized and characterized by elemental analyses, IR spectra and X-ray crystallography. In complex 1, Nd(Ⅲ) is bridged by pimelic acid ligands to form³D microporous structure. There are two types of lattice water in complex 1. One lies in microporous structure and the other is used to form O—H…O hydrogen bond. In complex 2, Er(Ⅲ) ions are connected by pimelate ligands into a 2D microporous layer structure. Two types of O—H…O hydrogen bonds make 2D framework into 3D supramolecular structure. Single crystal X-ray diffraction analyses shows that complex 3 is isostructural to complex 2. In three complexes, different conformations for H₂pim are found, showing that coordinating characteristics of the flexible ligands are different from the rigid ligands.

Key words: Rare earth element, Flexible ligand, Coordination polymer, Crystal structure

CLC Number:

O614

TrendMD:

HUANG Liang, ZHANG Li-Ping, JIN Lin-Pei . Microporous Rare Earth Coordination Polymers Constructed by a Flexible Pimelic Acid Ligand[J]. Chem. J. Chinese Universities, 2004, 25(3): 413.

References

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