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The 2-D heteronuclear coordination polymer {[Ag4Fe2(SCN)12(H2O)2] (inaH)2(H2O)2}n (1) (inaH is the abbreviation of protonated isonicotinic acid) with chemical formula C24Ag4Fe2N14O8S12 has been synthesized and characterized by single crystal X-ray diffraction, elemental analysis and IR spectroscopy. The Ag2S2 rings connect two kinds of octahedral geometries of Fe(III) ions, [Fe(NCS)6]3– and Fe(H2O)2(NCS)4]− units with bridging thiocyanate ions leading to 2-D [Ag4Fe2(SCN)12(H2O)22– anion framework. Four kinds of rings including the unprecedented thirty-two membered Ag4Fe4(SCN)8 rings share comers or edges in the 2-D anion layer structure. All thiocyanates coordinate to the metal ions according to the HSAB principle with N atoms binding to the Fe(III) ions and with S atoms binding to Ag(I) ions. Pronoated ina cations stabilize the layer structure as counter ions and hydrogen bonds were formed within the pronoated in a cations dimer and between the dimers and the lattice waters. Crystal data: Mr= 1560.44, triclinic, P1, a=0.76082(1) nm, b=0.9234 nm, c= 1.85611(4) nm, a= 103.0170(10)°, β=93.7780(10)°, y=97.4080(10)°, V= 1.25385(3) nm3, Z=1, μ(Mo Kα)=2.650 mm−1, Dc,=2.067 g · cm−3, F(000)=758, R1=0.0412. wR2=0.1003.

C21H37CuN3O7, triclinic, P1̅ (no. 2), a = 10.9210(9) Å, b = 11.626(1) Å, c = 12.038(1) Å, α = 85.588(2)°, β = 72.209(2)°, γ = 64.942(2)°, V = 1315.9 Å3, Z = 2, Rgt(F) = 0.0468, wRref(F2) = 0.1340, T = 296 K.

A novel rare earth metal complex of 2-mercaptopyridine N-oxide (Hmpo) was synthesized and characterized by single crystal X-ray diffraction, element analysis, and IR spectroscopy. The complex Pr(mpo)3(DMSO)2 (Hmpo = 2-mercaptopyridine N-oxide) (DMSO = dimethyl sulfoxide) (C19H24N3O5S5Pr) crystallizes in the triclinic system, space group $$P\overline 1$$ with lattice parameters a = 9.570(2), b = 9.902(2), c = 15.743(3) A. α = 89.00(3), β = 85.54(3), γ = 62.97(3)°, D c =1.694 g⋅cm−3, Mr = 675.62, Z = 2. The coordination number of praseodymium (III) is eight, and its coordination geometry is a somewhat distorted bicapped trigonal prism. Surrounding Pr atom, three five-membered ring planes (Py, O, N, C, S) make dihedral angle of 84.86(7), 75.10(6), and 11.06(9)° respectively. One DMSO molecule is disordered and situated along a twofold axis with half-occupancy (occupation factor, G=0.5).

The synthesis as well as crystal and molecular structure of [Bi(C5H4NOS)3] are reported. The complex crystallizes in the monoclinic system, space group P21/n with lattice parameters a = 9.6521(3) A, b = 10.0659(4) A, c = 18.4484(7) A, β = 102.13(6)°, and D calc = 2.227 Mg · m−3 for Z = 4. It is clear from the packing diagram that the title compound is a dimer via the secondary coordination. Surrounding Bi atom, three five-membered ring planes (Bi,O,N,C,S) make a dihedral angle of 55.91, 54.72, and 26.13° respectively. The whole crystal presents a three-dimensional network structure as each molecule produces four weak C–H ⋅ ⋅ ⋅ O hydrogen bonds and a weak C–H ⋅ ⋅ ⋅ S hydrogen bond.

The crystal structures and magnetic properties of compounds [MII(apo)(N(CN)2)2], where M = Co (1), Ni (2) or Mn (3), apo = 2-aminopyridine N-oxide, have been determined. The structural analyses revealed that they are isomorphous, and all belong to monoclinic space group P21/n. The metal(II) ions display distorted octahedral co-ordination, with four terminal N atoms of different [N(CN)2]− ligands and two O atoms of different apo ligands. Two ions are bridged by two μ-O atoms to form a dimer subunit. Those dimers are further linked to each other by [N(CN)2]− resulting in a three-dimensional structure. The magnetic properties of the compounds were investigated in the temperature range 2–300 K for 1 and 2 and 4–300 K for 3. The values for the intradimer spin coupling constant J were estimated to be −17.8, −40, −1.3 cm−1 for 1–3, respectively, indicative of antiferromagnetic interaction.

C18H22N4O6Se2, monoclinic, P21/c (no. 14), a = 7.3648(4) Å, b = 15.2480(7) Å, c = 9.9280(5) Å, β = 101.311(3)°, V = 1093.2 Å3, Z = 2, Rgt(F) = 0.0230, wRref(F2) = 0.0602, T = 296 K.

C32H30N4Nd2O32, triclinic, P1̄ (no. 2), a = 8.137(3) Å, b = 8.800(3) Å, c = 15.184(5) Å, α = 100.201(7)°, β = 91.400(8)°, γ = 104.336(7)°, V = 1034.1 Å3, Z = 1, Rgt(F) = 0.0431, wRref(F2) = 0.1155, T = 296 K.

C22H19N3O, monoclinic, C2/c (no. 15), a = 10.597(5) Å, b = 13.740(6) Å, c = 24.82(1) Å, β = 94.764(5)°, V = 3600.9 Å3, Z = 8, Rgt(F) = 0.0374, wRref(F2) = 0.1120, T = 296 K.

In the title compound, C13H14N2O2·H2O, the dihedral angle between the benzene and pyridinone rings is 74.86 (7)°. In the crystal structure, the mol­ecules are linked by a pair of O—H⋯O hydrogen bonds [O⋯O = 2.662 (2) A], forming a centrosymmetric dimer. In addition, the mol­ecules are linked via O—H⋯O, O—H⋯N and N—H⋯O inter­molecular hydrogen bonds involving the water mol­ecules, and C—H⋯O inter­actions.

The crystal structure of yellow [Ni(L)(N3)2]·H2O, where L is N,N′-bis­[2-(2-pyridyl)­ethyl­ene]-1,3-di­amino­propane (C15H16N4), containing six-coordinate nickel(II) with an octahedral [NiIIN6] core, is reported. Four N atoms of the Schiff base ligand form the equatorial plane and two N atoms of two azide ligands occupy the axial positions.

In the crystal structure of the title compound, (C6H6NO2)2[Fe(NCS)5(H2O)]·2C6H5NO2, the iron complex lies on a mirror plane; the six-coordinate FeIII ion, the coordinated water molecule and three of the five isothiocyanate ligands are located on this plane. The crystal structure is triple-layered. The pyridinium-4-carboxylate (ina) molecules and the protonated 4-carboxypyridinium (inaH+) cations interact with each other through N—H...O and O—H...O hydrogen bonds, leading to the formation of a layer perpendicular to the b axis. Pairs of these layers sandwich another layer of {[Fe(NCS)5(H2O)]2−} n anions with which they interact via electrostatic attraction and O—H...O hydrogen bonds, resulting in sheets of triple layers also perpendicular to the b axis.

In the crystal structure of the title compound, [Co(H2O)4(NCS)2]·2C6H12N4, the six-coordinated CoII atom lies on a special position of mmm site symmetry and the hexa­methyl­ene­tetra­mine mol­ecule about a special position of \overline{4} site symmetry. The two entities inter­act through an O—H⋯N hydrogen bond to form a three-dimensional network.