Poly[[diaqua­bis­(2,2′-bipyridine)­bis­(μ3-5-hy­droxy­isophthalato)(μ2-5-hy­droxy­isophthalato)digadolinium(III)] trihydrate]

The asymmetric unit of the title coordination polymer, {[Gd2(C8H4O5)3(C10H8N2)2(H2O)2]·3H2O}n, contains two GdIII cations, one of which is surrounded by three 5-hy­droxy­isophthalate anions, one 2,2′-bipyridine ligand and two water mol­ecules in a distorted N2O7 tricapped trigonal–prismatic coordination geometry. The other Gd cation is coordinated by four 5-hy­droxy­isophthalate anions and one 2,2′-bipyridine ligand in a distorted N2O7 tricapped trigonal–prismatic coordination geometry. The 5-hy­droxy­isophthalate anions bridge the Gd cations, forming a layer structure. The layers are further connected by extensive O—H⋯O hydrogen bonding, assembling a three-dimensional supra­molecular network

catena-Poly[[hexa­kis(μ-4-methyl­benzoato)-κ2 O,O′;κ15 O,O′:O-trieuropium(III)]-tris­(μ-4-methyl­benzoato)-κ2 O,O′;κ6 O,O′:O]

The title europium(III) carboxyl­ate, [Eu3(C8H7O2)9]n, has three independent Eu atoms, two of which are eight-coordinate in a square-anti­prismatic coordination geometry, whereas the third is nine-coordinate in a tricapped trigonal-prismatic coordination geometry. The metal atoms are linked by two bidentate and seven tridentate methyl­benzoate groups into a linear chain running along the b-axis direction

Poly[μ6-pyridine-2,4-dicarboxyl­ato-barium]

In the title complex, [Ba(C7H3NO4)]n, the coordination geometry around the BaII ion can be described as a distorted bicapped trigonal-prismatic BaNO7 arrangement. The pyridine-2,4-dicarb­oxy­lic acid ligands exhibit a new coordination mode. Adjacent metal centers are linked by the O atoms of the pyridine-2,4-dicarb­oxy­lic acid ligands, and then form a three-dimensional supra­molecular polymeric framework

Poly[tetra­deca­aqua­tetra­kis­(μ3-imidazole-4,5-dicarboxyl­ato)hexa-μ3-sulfato-cobalt(II)hexa­samarium(III)]

In the title three-dimensional compound, [CoSm6(C5H2N2O4)4(SO4)6(H2O)14]n, the CoII ion is six-coordinated with two O atoms and two N atoms from two imidazole-4,5-dicarboxyl­ate ligands and two coordinated water mol­ecules, giving a slightly distorted octa­hedral geometry. One SmIII ion is eight-coordinated in a bicapped trigonal–prismatic coordination geometry by four O atoms from two imidazole-4,5-dicarboxyl­ate ligands, two O atoms from two SO4 2− anions and two coordinated water mol­ecules. The other two SmIII ions are nine-coordinated in a tricapped trigonal–prismatic coordination geometry; one of these SmIII ions is bonded to four O atoms from two imidazole-4,5-dicarboxyl­ate ligands, three O atoms from three SO4 2− anions and two water O atoms, and the other SmIII ion is coordinated by one O atom and one N atom from one imidazole-4,5-dicarboxyl­ate ligand, five O atoms from three SO4 2− anions, as well as two coordinated water mol­ecules. The crystal structure is further stabilized by N—H⋯O, O—H⋯O, and C—H⋯O hydrogen-bonding inter­actions

A-type Ce2NCl3

Cerium(III) nitride chloride, Ce2NCl3, contains trans-edge connected [NCe4]9+ tetra­hedra (222 symmetry) forming chains parallel to the c axis that are separated by Cl− anions. The Ce3+ cations (..m symmetry) are each surrounded by two N3− and six Cl− anions in a bicapped trigonal prismatic coordination geometry (CN = 8)

Poly[[triaqua­(μ3-4-oxidopyridine-2,6-dicarboxyl­ato)holmium(III)] mono­hydrate]

In the title coordination polymer, {[Ho(C7H2NO5)(H2O)3]·H2O}n, the HoIII atom is eight-coordinated by a tridentate 4-oxidopyridine-2,6-dicarboxyl­ate trianion, two monodentate anions and three water mol­ecules, forming a distorted bicapped trigonal–prismatic HoNO7 coordination geometry. The anions bridge adjacent HoIII ions into double chains. Adjacent chains are further connected into sheets. O—H⋯O hydrogen bonds involving both coordinated and uncoordinated water mol­ecules generate a three-dimensional supra­molecular framework

Structural Disorder, Octahedral Coordination, and 2-Dimensional Ferromagnetism in Anhydrous Alums

The crystal structures of the triangular lattice, layered anhydrous alums KCr(SO4)2, RbCr(SO4)2 and KAl(SO4)2 are characterized by X-ray and neutron powder diffraction at temperatures between 1.4 and 773 K. The compounds all crystallize in the space group P-3, with octahedral coordination of the trivalent cations. In all cases, small amounts of disorder in the stacking of the triangular layers of corner sharing MO6 octahedra and SO4 tetrahedra is seen, with the MO6-SO4 network rotated in opposite directions between layers. The electron diffraction study of KCr(SO4)2 supports this model, which on average can be taken to imply trigonal prismatic coordination for the M3+ ions; as was previously reported for the prototype anhydrous alum KAl(SO4)2. The temperature dependent magnetic susceptibilities for ACr(SO4)2 (A = K,Rb,Cs) indicate the presence of predominantly ferromagnetic interactions. Low temperature powder neutron diffraction reveals that the magnetic ordering is ferromagnetic in-plane, with antiferromagnetic ordering between planes below 3 K.Comment: Accepted to the Journal of Solid State Chemistr

Poly[[triaqua­(μ3-4-oxidopyridine-2,6-dicarboxyl­ato)thulium(III)] monohydrate]

In the title coordination polymer, {[Tm(C7H2NO5)(H2O)3]·H2O}n, the TmIII atom is eight-coordinated by a tridentate 4-oxidopyridine-2,6-dicarboxyl­ate trianion, two monodentate anions and three water mol­ecules, forming a distorted bicapped trigonal–prismatic TmNO7 coordination geometry. The anions bridge adjacent TmIII ions into double chains. Adjacent chains are further connected into sheets. O—H⋯O hydrogen bonds involving both coordinated and uncoordinated water mol­ecules generate a three-dimensional supra­molecular framework

Poly[[aqua­tris­(μ4-benzene-1,2-dicarboxyl­ato)dilanthanum(III)] hemihydrate]

The asymmetric unit of the title coordination polymer, {[La2(C8H4O4)3(H2O)]·0.5H2O}n, contains two independent LaIII atoms, one of which is surrounded by eight carboxyl­ate-O atoms from six benzene-1,2-dicarboxyl­ate (BDC) anions in a bicapped trigonal–prismatic geometry. The other LaIII atom is nine-coordinated in a tricapped trigonal–prismatic geometry, formed by eight carboxyl­ate-O atoms from six BDC anions and a coordinated water mol­ecule. The BDC anions bridge the LaIII atoms, forming a two-dimensional polymeric complex parallel to (001). The crystal structure contains weak O—H⋯O and non-classical C—H⋯O hydrogen bonds. A C—H⋯π inter­action is also present in the crystal structure. The uncoordinated water molecule shows half-occupation

Poly[hexa­aqua­tri-μ-malonato-didysprosium(III)]

The title compound, [Dy2(C3H2O4)3(H2O)6]n, forms a coordination polymeric structure comprising hydrated dysprosium ions and malonate ligands. In the asymmetric unit, there are one dysprosium ion, one and a half malonate ligands, and three water mol­ecules. Each DyIII atom is coordinated by six O atoms from four malonate ligands and by three water mol­ecules, and displays a tricapped trigonal–prismatic coordination geometry. The malonate ligands adopt two types of coordination mode, linking dysprosium centres to form a three-dimensional coordination polymer. The extensive network of hydrogen bonds in this polymer enhances the structural stability