Methyl 2,2-diphenyl-2-(prop-2-yn-1-yl­oxy)acetate

The mol­ecular structure of the title compound, C₁₈H₁₆O₃, exhibits a new R₂-C(COOMe)(OCH₂CCH) group. The C-O-C-C torsion angle is 153.3 (1)°. The dihedral angles are 79.89 (5)° between phen­yl/phenyl planes, and 73.13 (5) and 79.05 (8)° for the two COOMe/phenyl plane pairs.

4-[Bis(4-fluoro­phen­yl)meth­yl]piperazin-1-ium bis­(trichloro­acetate) 0.4-hydrate

The title compound, C₁₇H₂₀F₂N₂²⁺·2C₂Cl₃O₂⁻·0.4H₂O, has twofold protonated N atoms. The trichloro­acetate anions each show one disordered Cl atom with site occupation factors of 0.945 (7):0.055 (7) 0.945 (8):0.055 (8). In the crystal, N—H...O, O(water)—H...O and O(water)—H...F inter­actions connect the components into a three-dimensional network.

Bis{1-[2-(diphenyl­phosphan­yl)eth­yl]-3-ethyl­imidazol-2-yl­idene}nickel(II) diiodide acetonitrile disolvate

The mol­ecular structure of the title compound, [Ni(C₁₉H₂₁N₂P)₂]I₂·2CH₃CN, shows two six-membered N-heterocyclic carbene/phosphane chelate rings that form a nearly square-planar coordination geometry around the Ni^II atom, which lies 0.190 (1) Å above the C₂P₂ plane. The sum of the bond angles at the Ni^II atom is 358.68 (6)°, with C-Ni-P bite angles of 82.89 (5) and 84.08 (6)°. The two carbene rings make a dihedral angle of 52.65 (8)°.

4-[Bis(4-fluoro­phen­yl)meth­yl]piperazin-1-ium 2-hy­droxy­benzoate 2-hy­droxy­benzoic acid monosolvate

The title compound, C₁₇H₁₉F₂N₂⁺·C₇H₅O₃⁻·C₇H₆O₃, is a co-crystal from 4-[bis­(4-fluoro­phen­yl)meth­yl]piperazin-1-ium, salicylate anion and salicylic acid in a 1:1:1 ratio. In addition to an intra­molecular O—H...O hydrogen bond, the crystal packing shows hydrogen bonds between the piperazinium cation and salicylate anion (N—H...O), as well as between the salicylic acid mol­ecule and anion (O—H...O), giving rise to a three-dimensional network.

Bis(2-{[bis­(dimethyl­amino)­methyl­idene]amino-κN}benzene­sulfonato-κN)copper(II)

The mol­ecular structure of the title compound, [Cu(C₁₁H₁₆N₃O₃S)₂], shows the Cu^II atom with a distorted square-planar coordination geometry from the N₂O₂ donor set of the two chelating 2-{[bis­(dimethyl­amino)­methyl­idene]amino}­benzene­sulfonate ligands. The Cu^II atom lies 0.065 (1) Å above the N₂O₂ plane and the Cu—O [2 × 1.945 (2) Å] and Cu—N bond lengths [1.968 (3) and 1.962 (3) Å] lie in expected ranges. The two aromatic ring planes make a dihedral angle of 85.48 (1)°.

Tricarbonyl­bis­(1,3-diisopropyl-4,5-dimethyl­imidazol-2-yl­idene)iron

In the title compound, [Fe(C₁₁H₂₀N₂)₂(CO)₃], the Fe atom shows a distorted trigonal–bipyramidal geometry with three carbonyl and two carbene ligands. The latter have a cis arrangement, with a C—Fe—C angle of 90.60 (7)°. The Fe atom lies 0.007 (1) Å above the basal plane defined by two carbonyl and one carbene C atoms. The mol­ecular structure is closely related to that of the isomolecular but not isotypic Ru complex with an identical cis arrangement, so, in general, bond geometries lie in expected ranges. In the crystal, C—H...O hydrogen bonds link the mol­ecules into infinite zigzag chains extending along [010].

Caffeine–N-phthaloyl-β-alanine (1/1)

The title co-crystal [systematic name: 3-(1,3-dioxoisoindolin-2-yl)propanoic acid–1,3,7-trimethyl-1H-purine-2,6(3H,7H)-dione (1/1)], C₈H₁₀N₄O₂·C₁₁H₉NO₄, is the combination of 1:1 adduct of N-phthaloyl-β-alanine with caffeine. The phthalimide and purine rings in the N-phthaloyl-β-alanine and caffeine mol­ecules are essentially planar, with r.m.s. deviations of the fitted atoms of 0.0078 and 0.0118 Å, respectively. In the crystal, the two mol­ecules are linked via an O—H...N hydrogen bond involving the intact carb­oxy­lic acid (COOH) group. The crystal structure is consolidated by C—H...O inter­actions. The H atoms of a methyl group of the caffeine mol­ecule are disordered over two sets of sites of equal occupancy.

6-Meth­oxy-1,3-benzothia­zol-2-amine

The title compound, C₈H₈N₂OS, is almost planar, the C—C—O—C torsion angle associated with the meth­oxy group being 0.72 (1)°. Inter­molecular amine N—H...N hydrogen-bonding inter­actions form inversion dimers [graph set R₂²(8)] which are extended into chains along the b axis through amine N—H...O hydrogen bonds.

N′-(2,4-Dinitro­phen­yl)benzohydrazide

In the title compound, C₁₃H₁₀N₄O₅, the aromatic ring planes are close to perpendicular [dihedral angle = 75.94 (5)°] and the C—N—N—C torsion angle is 88.7 (2)°. Both nitro groups lie close to their attached ring plane, with C—C—N—O torsion angles of 3.1 (2) and 5.3 (2)°. This allows for the formation of an intra­molecular N—H...O hydrogen bond, which closes an S(6) ring. In the crystal, N—H...O hydrogen bonds link the mol­ecules into zigzag chains extending along [100].

N-(4-Chloro­phen­yl)-4-nitro­benzamide

The title compound, C₁₃H₉ClN₂O₃, is almost planar, showing a dihedral angle of 4.63 (6)° between the aromatic ring planes. The nitro group also lies in the plane, the C—C—N—O torsion angle being 6.7 (2)°. There is an intamolecular C—H...O hydrogen bond. The crystal structure features N—H...O(nitro) hydrogen bonds that link the mol­ecules into zigzag chains extending along [010].