1,3,5-Tris(pyridin-3-yl)-2,4-diaza­penta-1,4-diene

In the solid state, the structure of the title compound, C18H15N5, is stabilized by weak C—H⋯N interactions. Mol­ecules are arranged in layers parallel to the bc plane forming an inter­esting supra­molecular structure

2,4,5-Tris(pyridin-4-yl)-4,5-dihydro-1,3-oxazole

In the title compound, C18H14N4O, the mol­ecules are disordered about a crystallographic twofold axis, leading to 50:50 disorder of the O- and N-atom sites within the oxazole ring. As a consequence, symmetry-related oxazole C—N and C—O bonds are averaged. The oxazole ring makes a dihedral angle of 6.920 (1)° with the pyridyl ring in the 2-position and 60.960 (2)° with the pyridyl rings in the 4- and 5-positions

Asymmetric transfer hydrogenation of ketones in aqueous solution catalyzed by rhodium(III) complexes with C2-symmetric fluorene-ligands containing chiral (1R,2R)-cyclohexane-1,2-diamine

Two C2-symmetric bis(sulfonamide) ligands containing fluorene-chiral (1R,2R)-cyclohexane-1,2-diamine were complexed to RhIII(Cp*) and used as catalyst to reduce aromatic ketones. The corresponding chiral secondary alcohols were obtained in 87-100% ee and 85-99% yield, under asymmetric transfer hydrogenation (ATH) conditions using aqueous sodium formate as the hydride source. With acetophenone, 94% ee and 86-97% yield was achieved with substrate/catalyst (S/C) ratio of 10,000

Dichloridobis(methanol-κO)[cis-(±)-2,4,5-tris­(pyridin-2-yl)-2-imidazoline-κ3 N 2,N 3,N 4]ytterbium(III) chloride

In the crystal structure of the title complex, [YbCl2(C18H15N5)(CH3OH)2]Cl, the pseudo-penta­gonal–bipyramidal coordination geometry of the YbIII cation is composed of three N atoms from one cis-(±)-2,4,5-tris­(pyridin-2-yl)imidazoline (HL) ligand, two O atoms from two methanol mol­ecules and two Cl− anions. Chains are formed along [010] through N—H⋯Cl, O—H⋯Cl and O—H⋯N hydrogen bonds

N-(2-Hydroxy­ethyl)-2-[3-(p-tol­yl)triazen-1-yl]benzamide

In the solid state, the structure of the title compound, C16H18N4O2, is stabilized by inter­molecular N—H⋯O and O—H⋯O hydrogen bonds. These hydrogen bonds arrange the mol­ecules into a double-layer supra­molecular structure. The mol­ecular conformation is is consolidated by an intra­molecular N—H⋯N hydrogen bond. The dihedral angle between the aromatic rings is 8.01 (10)

Asymmentric transfer hydrogenation in aqueous solution catalyzed by rhodium complexes with C2-symmetric flourence-ligans containing chiral (1R,2R)-cyclohexane-1,2-diamine

Two C2-symmetric bis(sulfonamide) ligands containing fluorene-chiral (1R,2R)-cyclohexane-1,2-diamine were complexed to RhIII(Cp*) and used as catalyst to reduce aromatic ketones. The corresponding chiral secondary alcohols were obtained in 87-100% ee and 85-99% yield, under asymmetric transfer hydrogenation (ATH) conditions using aqueous sodium formate as the hydride source. With acetophenone, 94% ee and 86-97% yield was achieved with substrate/catalyst (S/C) ratio of 10,000.Dos complejos bis (sulfonamida) simétricos en C2 que contenían (1R, 2R) -ciclohexano-1,2-diamina fluoreno-quiral se complejaron a RhIII (Cp *) y se usaron como catalizadores para reducir cetonas aromáticas. Los correspondientes alcoholes secundarios quirales se obtuvieron en 87-100% de ee y 85-99% de rendimiento, en condiciones de hidrogenación de transferencia asimétrica (ATH) usando formiato de sodio acuoso como fuente de hidruro. Con acetofenona, se obtuvo un 94% de ee y un rendimiento de 86-97% con una relación de sustrato / catalizador (S / C) de 10.000

Two coordination modes of CuII in a binuclear complex with N-(pyridin-2-ylcarbonyl)pyridine-2-carboxamidate ligands

In the title dinuclear complex, (acetonitrile-1κN)[μ-N-(pyridin-2-ylcarbonyl)pyridine-2-carboxamidato-1:2κ5N,N′,N′′:O,O′][N-(pyridin-2-ylcarbonyl)pyridine-2-carboxamidato-2κ3N,N′,N′′]bis(trifluoromethanesulfonato-1κO)dicopper(II), [Cu2(C12H8N3O2)2(CF3O3S)2(CH3CN)], one of the CuII ions is five-coordinated in a distorted square-pyramidal N3O2 environment provided by two N-(pyridin-2-ylcarbonyl)pyridine-2-carboxamidate (bpca) ligands, while the second CuII ion is six-coordinated in a distorted octahedral N4O2 environment provided by one bpca ligand, two trifluoromethansulfonate ligands and one acetonitrile molecule. Weak intermolecular C—H...O and C—H...F hydrogen bonds and π–π stacking interactions with centroid–centroid distances of 3.6799 (15) and 3.8520 (16) Å stabilize the crystal packing and lead to a three-dimensional network

(1RS,2RS)-4,4′-(1-Azaniumyl-2-hydroxyethane-1,2-diyl)dipyridinium tetrachloridoplatinate(II) chloride

The title compound, (C12H16N3O)[PtCl4]Cl, consists of a 4,4′-(1-azaniumyl-2-hydroxyethane-1,2-diyl)dipyridinium trication, a square-planar tetrachloridoplatinate(II) dianion and a chloride ion. In the cation, the pyridinium rings attached to the central 1-azaniumyl-2-hydroxyethane fragment have an anti conformation, as indicated by the central C—C—C—C torsion angle of −166.5 (6)°, and they are inclined to one another by 63.5 (4)°. In the crystal, the cations and anions are linked through N—H...Cl and O—H...Cl hydrogen bonds. There are also π–π contacts [centroid–centroid distances = 3.671 (4) and 3.851 (4) Å] and a number of C—H...Cl interactions present, consolidating the formation of a three-dimensional supramolecular structure