1,2-Di-4-pyridylethane N,N′-dioxide–acetic acid (1/2)

The title compound, C12H12N2O2·2C2H4O2, was prepared from 1,2-di-4-pyridylethane, acetic acid, and hydrogen peroxide. The 1,2-di-4-pyridylethane N,N′-dioxide mol­ecule is located on an inversion center. π–π stacking inter­actions between neighboring 1,2-di-4-pyridylethane N,N′-dioxide mol­ecules are observed with a centroid–centroid distance of 3.613 Å, an inter­planar distance of 3.317 Å, and a slippage of 1.433 Å. O—H⋯O hydrogen-bonding inter­actions between 1,2-di-4-pyridylethane N,N′-dioxide and acetic acid mol­ecules result in distinct hydrogen-bonded units made of one N-oxide and two acetic acid mol­ecules. These units are then linked into a three-dimensional network through weaker C—H⋯O hydrogen-bonding inter­actions

2-Methyl­pyrazine 1,4-dioxide

The title compound, C5H6N2O2, was prepared from 2-methyl­pyrazine, acetic acid and hydrogen peroxide. In the crystal, π–π stacking inter­actions between neighboring mol­ecules are observed, with a centroid–centroid distance of 3.7370 Å, an inter­planar distance of 3.167 Å, and a slippage of 1.984 Å. Each mol­ecule is linked to four neighbors through C—H⋯O hydrogen-bonding inter­actions, forming one-dimensional ribbons

2,5-Dimethyl­pyrazine 1,4-dioxide

The title compound, C6H8N2O2, was prepared from 2,5-dimethyl­pyrazine, acetic acid, and hydrogen peroxide. The 2,5-dimethyl­pyrazine 1,4-dioxide mol­ecule is located on an inversion center. π–π inter­actions between neighboring 2,5-dimethyl­pyrazine 1,4-dioxide mol­ecules are observed with an inter­planar distance of 3.191 Å. Each 2,5-dimethyl­pyrazine 1,4-dioxide mol­ecule is linked to four neighboring N-oxide mol­ecules through C—H⋯O hydrogen-bonding inter­actions, forming two-dimensional layers

Poly[[tris­(μ2-4,4′-bipyridine N,N′-di­oxide)hexa­nitratodigadolinium(III)] dichloro­methane disolvate]

The title one-dimensional coordination network, {[Gd2(NO3)6(C10H8N2O2)3]·2CH2Cl2}n, is isostructural with the previously reported Tb and Tl coordination networks and to its Eu analog. The GdIII cation is coordinated in a distorted tricapped trigonal-prismatic fashion by nine O atoms from three bridging 4,4′-bipyridine N,N′-dioxide ligands and three chelating nitrate anions. None of the atoms lie on a special position, but there is an inversion center located between the rings of one of the ligands. The network topology is ladder-like, and each ladder inter­acts with six neighboring ladders through C—H⋯O hydrogen bonds. The packing motif of the ladders allows for the formation of channels that run parallel to the a axis; these channels are filled with CH2Cl2 solvent mol­ecules that inter­act with the ladders through C—H⋯O hydrogen bond

Poly[[tetra­kis­(μ2-pyrazine N,N′-dioxide-κ2 O:O′)erbium(III)] tris­(perchlorate)]

The title three-dimensional coordination network, {[Er(C4H4N2O2)4](ClO4)3}n, is isostructural to that of other lanthanides. The Er+3 cation lies on a fourfold roto-inversion axis. It is coordinated in a distorted square-anti­prismatic fashion by eight O atoms from bridging pyrazine N,N′-dioxide ligands. There are two unique pyrazine N,N′-dioxide ligands. One ring is located around an inversion center, and there is a a twofold rotation axis at the center of the other ring. There are also two unique perchlorate anions. One is centered on a twofold rotation axis and the other on a fourfold roto-inversion axis. The perchlorate anions are located in channels that run perpendicular to (001) and (110) and inter­act with the coordination network through C—H⋯O hydrogen bonds

Poly[[tetra­kis­(μ2-pyrazine N,N′-dioxide-κ2 O:O′)holmium(III)] tris­(perchlorate)]

The title three-dimensional coordination network, {[Ho(C4H4N2O2)4](ClO4)3}n, is isostructural to that of other lanthanides. The Ho+3 cation lies on a fourfold roto-inversion axis. It is coordinated in a distorted square anti-prismatic fashion by eight O atoms from bridging pyrazine N,N′-dioxide ligands. There are two unique pyrazine N,N′-dioxide ligands. One ring is located around an inversion center, and there is a a twofold rotation axis at the center of the other ring. There are also two unique perchlorate anions. One is centered on a twofold rotation axis and the other on a fourfold roto-inversion axis. The perchlorate anions are located in channels that run perpendicular to (001) (110) and inter­act with the coordination network through C—H⋯O hydrogen bonds

Poly[[tris­(μ2-4,4′-bipyridine N,N′-di­oxide)hexa­nitratodieuropium(III)] dichloro­methane disolvate]

The title one-dimensional coordination network, {[Eu2(NO3)6(C10H8N2O2)3]·2CH2Cl2}n, is isostructural with the previously reported Tb and Tl coordination networks and to its Gd analog. The EuIII cation is coordinated in a distorted tricapped trigonal-prismatic fashion by nine O atoms from three bridging 4,4′-bipyridine N,N′-dioxide ligands and three chelating nitrate anions. None of the atoms lie on a special position, but there is an inversion center located between the rings of one of the ligands. The network topology is ladder-like, and each ladder inter­acts with six neighboring ladders through C—H⋯O hydrogen bonds. The packing motif of the ladders allows for the formation of channels that run parallel to the a axis; these channels are filled with CH2Cl2 solvent mol­ecules that inter­act with the ladders through C—H⋯O hydrogen bonds

Bis{bis(azido-κN)bis[bis(pyridin-2-yl-κN)amine]cobalt(III)} sulfate dihydrate

The search for new molecular materials with interesting magnetic properties, using the pseudohalide azide ion and di-2-pyridylamine (dpa, C10H9N3) as a chelating ligand, led to the synthesis and structure determination of the title compound, [Co(N3)2(dpa)2]2SO4·2H2O. The crystal structure comprises discrete [Co(dpa)2(N3)2]+ cations, sulfate anions, as well as H2O solvent molecules. The CoIII cations display a slightly distorted octahedral coordination sphere defined by two N atoms from azide anions and four N atoms from the pyridyl rings of two dpa ligands. In the crystal, extensive C—H...O, N—H...O, and O—H...O interactions result in supramolecular sheets that lie parallel to the ab plane. The sheets are further linked through O—H...N interactions between the water molecules of one sheet and azide anions of another sheet, forming a supramolecular framework

Crystal structure of di-μ-aqua-μ-(pyrazine N,N′-dioxide)-κ2O:O-bis(diaquasodium) tetraphenylborate dihydrate pyrazine N,N′-dioxide monosolvate

The search for novel lanthanide coordination networks using pyrazine N,N′-dioxide (pzdo, C4H4N2O2) as a structure-directing unit, led to the synthesis and the structure determination of the title compound, [Na2(C4H4N2O2)(H2O)6][B(C6H5)4]2·C4H4N2O2·2H2O. The crystal structure is comprised of discrete [{Na(H2O)2}2(μ-H2O)2(μ-pzdo)]2+ cations and tetraphenylborate anions, as well as pzdo and H2O solvent molecules. The dinuclear cation is located about a twofold rotation axis, and the symmetry-related NaI atoms display a distorted square-pyramidal coordination sphere defined by two O atoms of terminal water ligands, two O atoms of bridging water ligands and one O atom of a bridging pzdo ligand. In the crystal, O—H...O hydrogen bonds link the dinuclear cation and solvent pzdo molecules (point-group symmetry -1) into rectangular grid-like layers parallel to the bc plane. Additional C—H...O, O—H...O, C—H...π and O—H...π interactions link the anion and solvent water molecules to the layers. The layers are further linked into a three-dimensional network through a combination of C—H...π and O—H...π hydrogen bonds involving the tetraphenylborate anion