A 3d-4f Complex Constructed by the Assembly of a Cationic Template, [Cu(en)(2)](2+), and a 3D Anionic Coordination Polymer, [Sm-2(C2O4)(3)(C5O5)(H2O)(2)](2-)

摘要

A three-dimensional (3D) 3d-4f complex, [Cu(en)(2)][Sm-2(C5O5)(C2O4)(3)(H2O)(2)]8H(2)O (1) (en = ethylenediamine, C5O52- = dianion of 4,5-dihydroxycyclopent-4-ene-1,2,3-trione), were prepared via the in-situ ring-opening oxidation reaction of croconate in the presence of the template-directed complex, [Cu(en)(2)](2+) cation. The structural characterization determined by X-ray diffraction determination reveals that the 3D anionic coordination polymer of [Sm-2(C2O4)(3)(C5O5)(H2O)(2)](2-) in 1 can be describe in terms of in-plane 2D honeycomb-like [Sm-2(C2O4)(3)] layered frameworks bridged by oxalate with bis-chelating mode, being mutually interlinked via the bridge of (1,2,3,4)-croconate ligands with bis-chelating coordination mode to complete the 3D open framework, which gives rise to 1D channels with pore size of 14.023x11.893 angstrom (longest atom-atom contact distances) along the b axis. The structure-directing complex, [Cu(en)(2)](2+), and solvated water molecules are resided into these honeycomb-type hexagonal channels. The thermal stability of 1 was further studied by TGA and in-situ powder X-ray diffraction measurement.