Tricarbonylbis­(triphenyl­phosphane-κP)iridium(I) hexa­fluoridophosphate methanol monosolvate

In the title compound, [Ir(C₁₈H₁₅P)₂(CO)₃]PF₆·CH₃OH, the Ir^I atom is coordinated by two triphenyl­phosphine ligands in axial sites and three carbonyl ligands in the equatorial plane of a fairly regular trigonal bipyramid: the equatorial C—Ir—C angles range from 115.45 (9) to 126.42 (10)°. The small deviations from the ideal tetra­hedral geometry around the P atoms are illustrated by C—P—C angles ranging from 104.08 (9) to 106.46 (9)°. In the crystal, the mol­ecules are linked by weak C—H...F, C—H...O and C—H...π inter­actions.

Tetra-μ₃-hydroxido-tetra­kis­[tricarbonyl­rhenium(I)] pyridine tetra­solvate

The title compound, [Re₄(μ₃-OH)₄(CO)₁₂]·4C₅H₅N, crystallizes with one tetranuclear rhenium(I) cubane-like molecule and four pyridine mol­ecules in the asymmetric unit. The coordination environment of each Re^I atom is distorted octahedral. Four intra­molecular O—H...N and four inter­molecular C—H...O hydrogen-bond inter­actions are observed. Relatively strong hydrogen bonds are found between the hydrogen-bond donor (μ₃-OH) and acceptor (basic N atom of pyridine), with N...O distances between 2.586 (10) and 2.628 (10) Å. Inter­cube distances of 9.873 (2) and 12.376 (3) Å are observed.

N,N′-(4,5-Dimethyl-1,2-phenyl­ene)bis­(pyridine-2-carboxamide)

In the title compound, C₂₀H₁₈N₄O₂, the dihedral angles between the central benzene ring and the pyridine rings are 57.55 (6) and 22.05 (8)°. The mol­ecular conformation is stabilized by intra­molecular N—H...N inter­actions and in the crystal structure an inter­molecular asymmetric cyclic hydrogen-bonding association involving both amide N—H donors and a common amide O-atom acceptor gives a chain extending along the c axis.

2-Amino-6-(quinoline-2-carboxamido)­pyridinium nitrate

In the title salt, C₁₅H₁₃N₄O⁺·NO₃⁻, an extensive network of N—H...N, N—H...O and C—H...O hydrogen-bond inter­actions are observed throughout the structure. Further stabilization is obtained by π–π stacking inter­actions between inversion-related quinoline systems and inversion-related pyridine rings, with respective centroid–centroid distances of 3.5866 (6) and 3.3980 (6) Å.