Heterometallic malonate complexes [Ag2Ni(H2O)2(R2mal)2]n (R2mal2– is the dimethylmalonate dianion (Me2mal2–) (1) or the cyclobutane-1,1-dicarboxylate dianion (Cbdc2–) (2)) and [Ag2Cu(H2O)(Me2mal)2]n (3) were synthesized. The bis-chelate fragment {M(R2mal)2} (M = Ni, Cu) composed of two dianions of an acid and a 3d metal atom is the structure-forming unit of these complexes. The mononuclear fragments are linked by silver(I) atoms, which are involved in argentophilic interactions, to form 2D coordination polymers.

2D coordination polymers of AgI—MII (MII = Ni, Cu) with anions of substituted malonic acids

In the title coordination polymer, {[Sm(2)(C(4)H(2)O(4))(3)(H(2)O)(6)]·6H(2)O}(n), the Sm(III) ion is nine-coordinated by four O atoms from three different maleate ligands, two O atoms from one fumarate ligand and three O atoms from three water mol-ecules. The fumarate ligand lies on an inversion center. Adjacent Sm(III) ions are bridged by the maleate and fumarate ligands, forming a layer parallel to (011). The layers are further linked by inter-molecular O-H⋯O hydrogen bonds into a three-dimensional supra-molecular network.

Poly[[hexa-aqua-(μ(2)-fumarato-κO,O:O,O)bis-(μ(3)-maleato-κO,O:O:O)disamarium(III)] hexa-hydrate].

In the title coordination polymer, {[Sm2(C4H2O4)3(H2O)6]·6H2O}n, the SmIII ion is nine-coordinated by four O atoms from three different maleate ligands, two O atoms from one fumarate ligand and three O atoms from three water mol­ecules. The fumarate ligand lies on an inversion center. Adjacent SmIII ions are bridged by the maleate and fumarate ligands, forming a layer parallel to (011). The layers are further linked by inter­molecular O—H⋯O hydrogen bonds into a three-dimensional supra­molecular network.

https://journals.iucr.org/e/issues/2010/12/00/hy2363/hy2363.pdf

Poly[[hexa­aqua­(μ2-fumarato-κ4O1,O1′:O4,O4′)bis­(μ3-maleato-κ4O1,O1′:O4:O4′)disamarium(III)] hexa­hydrate]

In the title compound, Na2[Ni(C3H2O4)2(H2O)2]·2H2O, the Ni atom is coordinated by four O atoms from two malonate ligands and two water mol­ecules in a distorted octa­hedral geometry. The two independent Na+ ions are coordinated by five and six O atoms, respectively. The crystal structure is stabilized by the three-dimensional hydrogen-bonding network formed by O—H⋯O hydrogen bonds.

Tao Zhu

Papers

Disodium diaquabis(malonato-κ2O,O′)nickelate(II) dihydrate