Disodium μ-triethylenetetraaminehexa-acetato-bis[oxovanadate(IV)] hexahydrate

The crystals structure of the title heterometallic coordination compound, Na-2[(C18H24N4O12)(VO)(2)].6H(2)O, is built of Na+ cations, binuclear [C18H24N4O12(VO)(2)](2-) dianions and water molecules. The cations and anion occupy special positions at inversion centers. The V atom has an octahedral coordination environment formed by the vanadyl oxo atom [V=O 1.618 (3) Angstrom], two N [V - N 2.174 (4) and 2.289 (4) Angstrom] and three O atoms [V - O 1.993 (3), 1.998 (3) and 2.001 (3) Angstrom] of the amino-carboxylato group

Disodium bis(1,2,4,5-benzenetetracarboxylato)-dihydroxytetrazincate(II) pyrazine

The tetranuclear dianion of the title compound, Na-2[Zn-4(C10H2O8)(2)(OH)(2)] . C4H4N2, forms a network framework in which the Zn atom exists in a tetrahedral environment, as it is coordinated by the carboxyl O atoms belonging to three different (C10H2O8)(4-) anions as well as by the bridging OH group. Adjacent OH groups are linked together through the uncoordinated heterocycle, which lies on a site of 2/m symmetry. The octahedrally coordinated Na ion, which lies on a site of 2 symmetry, interacts with one O atom of the carboxyl group of two anions and with two O atoms of the ortho-carboxyl groups of two other anions

Diaquaiminodiacetatonickel(II)

The iminodiacetate dianion in diaquaiminodiacetato-nickel(II), [Ni(C4H5NO4)(H2O)(2)], chelates to the Ni atom through two carboxyl O and one imino N atoms; the six-fold coordination coordination environment comprises these three atoms, the water molecules and the carbonyl O atom of an adjacent dianionic group. The dative Ni<--O linkage leads to the formation of a helical chain running along the a axis of the orthorhombic crystal; adjacent chains are held in a network motif by hydrogen bonds

Polymeric dihydroxydiphthalatotricobalt(II)

In the crystal structure of dihydroxydiphthalatotricobalt(II), [Co-3(C8H4O4)(2)(OH)(2)](n), two of the four independent Co atoms lie at special positions of site symmetry 2. The hydroxy groups link three Co atoms to form a pyramidal Co3O unit, and adjacent Co3O units are linked through the Co base atoms into a honeycomb layer motif. Each of the phthalate dianions uses the O atoms of one carboxyl group to bind to three Co atoms, the bonding mode giving rise to six-coordinate Co atoms

Polymeric tetraapua(1,2,4,5-benzenetetracarboxylato)(pyrazine)dinickel(II) dihydrate

The Ni atom in the title compound, {[Ni-2(C10H2O8)(C4H4N2)( H2O)(4)] . 2H(2)O}(n), exists in an octahedral NO5Ni coordination environment that is defined by the two O atoms of a chelating carboxyl group, the O atom of a monodentate carboxyl group belonging to another carboxylato tetraanion, two water molecules and the N atom of the N-heterocycle. The tetracarboxylato anion and the pyrazine molecule are each located on a center of inversion. The bonding pattern leads to the formation of a layer structure; the layers are linked into a three-dimensional network by extensive hydrogen bonds involving the water molecules and the O atoms of the anionic unit

1,3-di-2-pyridylthiourea monohydrate

The title compound, C11H10N4S.H2O, displays an intramoleculear N-amido...N-pyridyl hydrogen bond [2.652 (2) Angstrom] that locks the thiourea unit and one pyridyl ring into coplanarity [dihedral angle 2.7 (1)degrees]. The second pyridyl ring is also coplanar with the thiourea unit [dihedral angle 2.9 (1)degrees]. Its attached N atom interacts with the lattice water molecule to form a helical hydrogen-bonded chain that runs parallel to the b axis of the orthorhombic unit cell; adjacent chains are linked into a layer-like architecture by another hydrogen bond between the water molecule and the double-bonded S atom

Tetraaqua-1,2,4,5-benzenetetracarboxylato(pyrazine)dicobalt(II) dihydrate

The Co(II) atom in polymeric {[Co-2(C10H2O8)(C4H4N2)(H2O)(4)].2H(2)O}(n) exists in an octahedral coordination environment defined by the two O atoms of a chelating carboxyl group, the O atom of a monodentate carboxyl group of another benzenetetracarboxylato unit, two water molecules and the N atom of the pyrazine. The tetraanionic ligand and the N-heterocycle are located on inversion centers. The layer structure is linked by hydrogen bonds into a network structure

5-amino-1,3-benzothiazole-2(3H)-thione

The two independent molecules of the title compound, C7H6N2S2, are linked by two secondary amino-thione hydrogen bonds [3.344 (3) and 3.376 (3) Angstrom] to form a flat pseudo-centrosymmetric dimer

catena-[μ(6)-1,2,4,5-benzenetetracarboxylato-tetraaqua-dinickel(II)] dihydrate

The two Ni atoms and the mu(6)-1,2,4,5-benzenetetracarboxylate ligand in the crystal structure of catena-[mu(6)-1,2,4,5-benzenetetracarboxylato-tetraaqua-dinickel(II)] dehydrate, [Ni-2(C10H2O8)(H2O)(4)].2(H2O), occupy special positions at three independent inversion centers. One of the Ni atoms is chelated by two 1,2,4,5-benzenetetracarboxylates [Ni-O 2.018 (3) and 2.021(3) Angstrom; O-Ni-O 91.7 (1)degrees]; the two remaining sites of the coordination octahedron of this atom are taken up by water molecules. The second Ni atom is coordinated by four carbonyl O atoms belonging to four benzenetetracarboxylate ligands [Ni-O 2.045 (3), 2.069 (3) Angstrom]; its coordination sphere also includes two water molecules. Each tetraanionic benzenetetracarboxylate ligand links together six Ni atoms, the linkages giving rise to a three-dimensional network motif. The structure is consolidated by hydrogen bonds involving coordinated as well as uncoordinated water molecules