Search

The hydrothermal reaction of rare earth nitrates, CuCN, 2,7-naphthalenedisulfonate (2,7-nds), and isonicotinic acid (Hina) affords a new family of 3-D heterometallic 3d–4f coordination polymers, [Ln2Cu(2,7-nds)2(ina)4(H2O)4]·4H2O (Ln = Nd (1), Sm (2), Eu (3), Gd (4); 2,7-nds = 2,7-naphthalenedisulfonate, Hina = isonicotinic acid). Complexes1–4are structurally characterized by single crystal X-ray diffraction, elemental analysis, FT-IR spectroscopy (IR), powder X-ray diffraction, and thermogravimetric analyses. X-ray crystal structure analyses reveal that1–4are isomorphous with dinuclear subunit [Sm2(ina)4] binding Cu ions to generate 2-D networks. Such 2-D networks are pillared by linking 2,7-nds ligands to result in the 3-D layer-pillared Ln(III)–Cu(II) coordination architectures. The valence of Cu salts changed in the reaction. In addition, the luminescence properties of1–3and the magnetic properties of3and4have also been investigated. [ABSTRACT FROM PUBLISHER]

Abstract: The first example of 3D heterometallic 4d–4f 2,7-naphthanlenedisulfonate compounds [LnAg2(2,7-NDS)(IN)3] (Ln=Sm (1), Eu (2), Gd (3), Tb (4), Dy(5); 2,7-NDS=2,7-naphthanlenedisulfonate; IN=isonicotinic acid) has been synthesized via hydrothermal reaction and characterized by single crystal X-ray diffraction, elemental analyses, FT-IR spectroscopy, powder X-ray diffraction(PXRD) and thermogravimetric analyses (TGA). X-Ray structural analysis reveals that compounds 1–5 exhibit same well-organized 3D coordination frameworks that are built up by 2D elliptical cylinder shaped [LnAg2(2,7-NDS)(IN)3] layers which are constructed by 1D anionic chains [Ln(2,7-NDS)(IN)3]2− linking the adjacent Ag(I) ions, and [LnAg(μ2-O)2] units, possessing a 7-connected topology with the Schläfli symbol of {33;411;56;6}. Furthermore, the luminescence properties of compounds 2 and 4 and the magnetic properties of compounds 3 and 5 were investigated. [Copyright &y& Elsevier]