TY - JOUR
T1 - Five related metal-organic frameworks constructed from [Ln 2(SO4)2(H2O)n] 2+ units and oxalate or acetate ligands
AU - Liu, Hsiao Chan
AU - Chen, I. Han
AU - Huang, Anny
AU - Huang, Sin Chiang
AU - Hsu, Kuei Fang
PY - 2009/5/5
Y1 - 2009/5/5
N2 - We have synthesized a series of lanthanide-based metal-organic solids and characterized them through structural, magnetic and luminescence analyses. The nine compounds in the series NH4[Ln(SO4)(H 2O)(C2O4)] [Ln = Ce, Nd, Eu, Gd (×2), Tb, Dy, Er, Yb] belong to four new three-dimensional (3D) structural groups, which we label CKMOF-4a, -4b, -5a, and -5b. The CKMOF-4a (Ce·1) and -4b (Gd·5, Tb·6, Dy·7, Er·8, Yb·9) structures feature [Ln2(SO4)2(H2O) 2]2+ units and C2O42- ligands having the same symmetry operations, but their SO4 2- anions feature different connective modes. These units are extended into one-dimensional ribbons fused together by oxalate ligands to form the two 3D open frameworks. The structures of CKMOF-5a (Nd·2) and -5b (Eu·3, Gd·4) comprise networks of c-glide-arranged [Ln 2(SO4)2(H2O)2] 2+ units, in which the oxalate ligands are encapsulated within eight-membered rings. The networks are supported by distinct sites of oxalate ligands to form the two types of 3D open frameworks, the structural topologies of which are distinguished by the versatile connective modes of the SO 42- anions. The polymeric phases CKMOF-4b and -5b exist in the Gd analogues. For the Dy analogues, varying the size of the cation used as the template led to the selective precipitation of each of these two phases. The layer structure of [Gd(SO4)(H2O)2(CH 3CO2)] (Gd·10), labelled CKMOF-6, assembled from [Gd2(SO4)2(H2O)4] 2+ units and acetate ligands; the geometries of the [Gd 2O2] rhombic units may induce ferromagnetic coupling at low temperature. Eu·3 and Tb·6 were luminescent, displaying red and green emissions, respectively.
AB - We have synthesized a series of lanthanide-based metal-organic solids and characterized them through structural, magnetic and luminescence analyses. The nine compounds in the series NH4[Ln(SO4)(H 2O)(C2O4)] [Ln = Ce, Nd, Eu, Gd (×2), Tb, Dy, Er, Yb] belong to four new three-dimensional (3D) structural groups, which we label CKMOF-4a, -4b, -5a, and -5b. The CKMOF-4a (Ce·1) and -4b (Gd·5, Tb·6, Dy·7, Er·8, Yb·9) structures feature [Ln2(SO4)2(H2O) 2]2+ units and C2O42- ligands having the same symmetry operations, but their SO4 2- anions feature different connective modes. These units are extended into one-dimensional ribbons fused together by oxalate ligands to form the two 3D open frameworks. The structures of CKMOF-5a (Nd·2) and -5b (Eu·3, Gd·4) comprise networks of c-glide-arranged [Ln 2(SO4)2(H2O)2] 2+ units, in which the oxalate ligands are encapsulated within eight-membered rings. The networks are supported by distinct sites of oxalate ligands to form the two types of 3D open frameworks, the structural topologies of which are distinguished by the versatile connective modes of the SO 42- anions. The polymeric phases CKMOF-4b and -5b exist in the Gd analogues. For the Dy analogues, varying the size of the cation used as the template led to the selective precipitation of each of these two phases. The layer structure of [Gd(SO4)(H2O)2(CH 3CO2)] (Gd·10), labelled CKMOF-6, assembled from [Gd2(SO4)2(H2O)4] 2+ units and acetate ligands; the geometries of the [Gd 2O2] rhombic units may induce ferromagnetic coupling at low temperature. Eu·3 and Tb·6 were luminescent, displaying red and green emissions, respectively.
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U2 - 10.1039/b819935c
DO - 10.1039/b819935c
M3 - Article
C2 - 19381407
AN - SCOPUS:65349153059
SN - 1477-9226
SP - 3447
EP - 3456
JO - Dalton Transactions
JF - Dalton Transactions
IS - 18
ER -