Hocine Merazig

3,4-Dimethylanilinium chloride monohydrate

The crystal structure of the title compound, C8H12N+·Cl−·H2O, consists of hydrophobic layers of dimethylanilinium cations parallel to the bc plane alternated by hydrophilic layers of chloride anions and water molecules. The layers are linked by N—H⋯O and N—H⋯Cl hydrogen bonds involving the ammonium groups of the cations. The cohesion of the ionic structure is further stabilized by O—H⋯Cl hydrogen-bonding interactions.

Bis[4-(di­methyl­amino)­pyridinium] tetra­chlorido­cuprate(II)

The asymmetric unit of the title salt, (C7H11N2)2[CuCl4], comprises half a tetrahedral tetrachloridocuprate anion, being located on a twofold axis, and a protonated 4-(dimethylamino)pyridine cation. The geometry around the CuII ion is highly distorted with the range of Cl—Cu—Cl angles being 94.94 (1)–141.03 (1)°. The crystal structure is stabilized by N—H⋯Cl and C—H⋯Cl hydrogen bonds. In the three-dimensional network, cations and anions pack in the lattice so as to generate chains of [CuCl4]2− anions separated by two orientations of cation layers, which are interlocked through π–π stacking contacts between pairs of pyridine rings, with centroid–centroid distances of 3.7874 (7) Å.

Bis(3-amino­pyrazine-2-carboxyl­ato-κ2N1,O)di­aqua­nickel(II) dihydrate

In the title compound, [Ni(C5H4N3O2)2(H2O)2]·2H2O, the NiII ion lies on an inversion center and is coordinated in an slightly distorted octahedral environment by two N,O-chelating 3-aminopyrazine-2-carboxylate (APZC) ligands in the equatorial plane and two trans-axial aqua ligands. In the crystal, O—H⋯O, N—H⋯O and O—H⋯N hydrogen bonds involving the solvent water molecules, aqua and APZC ligands form layers parallel to (010). These layers are linked further via O—H⋯O, N—H⋯O and C—H⋯O hydrogen bonds involving the axial aqua ligands, amino groups and the carboxylate groups of the APZC ligands, forming a three-dimensional network.

Undecacarbonyl(μ4‐2‐thiodithiobenzoato‐κ4C,S,S′,S′′)(trimethylphosphite)tetrafer

The title disubstituted tetranuclear cluster, [Fe4(C3H9O3P)2(C7H4S3)(CO)10], was obtained by heating the tetranuclear complex TN (Fe4S3C19O12H4) with an excess of trimethyl phosphite in acetone at 328 K. The structure shows that, of the two P(OMe)3 ligands, one has replaced a carbonyl on an Fe atom in the symmetric part of the tetranuclear cluster, whereas the second one has replaced a carbonyl on an Fe atom in the asymmetric part of the cluster.

l‐Histidinium dinitrate

The title salt, l-HisH22+·2NO3−, contains two nitrate anions and one l-histidinium dication. The anions and cations are linked to each other through strong hydrogen bonds, formed by all H atoms covalently bonded to the N and O atoms of the l-histidinium dications. This three-dimensional complex network of hydrogen bonds ensures the cohesion of the ionic structure.

[C 8 dabco]Br: a mild and convenient catalyst for intramolecular cyclization of 2-aminochalcones to the corresponding 2-aryl-2,3-dihydroquinolin-4(1 H )-ones

A new and convenient synthesis of 2-aryl-2,3-dihydroquinolin-4(1H)-ones has been described using the intramolecular cyclization of 2-aminochalcones catalyzed by 1-octyl-4-aza-1-azoniabicyclo[2.2.2]octane bromide ([C8dabco]Br). Recyclability of the catalyst, high yields, simple isolation of the products, and high atom economy are the noteworthy aspects of the protocol.

Crystal structure of bis-{1-[(E)-(2-meth-oxy-phen-yl)diazen-yl]naphthalen-2-olato-κ(3) O,N (2),O'}copper(II) containing an unknown solvate.

The title complex, [Cu(C17H13N2O2)2], crystallizes with two independent molecules in the asymmetric unit. Each CuII atom has a distorted ocahedral coordination environment defined by two N atoms and four O atoms from two tridentate 1-[(E)-(2-methoxyphenyl)diazenyl]naphthalen-2-olate ligands. In the crystal, the two molecules are linked via weak C—H⋯O hydrogen bonds which in turn stack parallel to [010]. A region of disordered electron density, most probably disordered methanol solvent molecules, was corrected for using the SQUEEZE routine in PLATON [Spek (2015). Acta Cryst. C71, 9–18]. Their formula mass and unit-cell characteristics were not taken into account during refinement.

Crystal structure of (E)-5-benz­yloxy-2-{[(4-nitro­phen­yl)imino]­meth­yl}phenol

In the title compound, C20H16N2O4, the molecule adopts an E conformation about the N=C bond. There is an intramolecular O—H⋯N hydrogen bond forming an S(6) ring motif. The nitrobenzene and benzyloxy rings are inclined to the central benzene ring by 4.34 (10) and 27.66 (11)°, respectively, and to one another by 31.40 (12)°. In the crystal, molecules are linked via C—H⋯O hydrogen bonds, forming zigzag chains along [001]. Within the chains there are C—H⋯π interactions present. The chains are linked via π–π interactions [inter-centroid distance = 3.7048 (15) Å], forming slabs parallel to the bc plane.

Crystal structure of {bis­[(1H-benzimid­azol-2-yl-κN3)meth­yl]sulfane}dichloridomercury(II)

In the asymmetric unit of the title compound, [HgCl2(C16H14N4S)], the HgII cation is linked to two Cl atoms and two imidazole N atoms of the chelating bis[(1H-benzimidazol-2-yl)methyl]sulfane ligand, forming a slightly distorted tetrahedral environment. The substitued imidazole rings of the ligand are almost perfectly planar [with maximum deviations of 0.017 (3) and 0.012 (3) Å] and form a dihedral angle of 42.51 (5)°. The crystal packing can be described as alternating layers parallel to (010). In this arrangement, N—H⋯Cl hydrogen bonds between the N—H groups of the benzimidazole moieties and chloride ligands are responsible for the formation of the chain-like packing pattern along [010] exhibiting a C(6) graph-set motif.

A new P,S-coordinating ferrocenyl ligand: synthesis of a precursor and its coordination compounds with PdII and PtII

In our ongoing development of ferrocene ligands, 1-dimethylamino-2-(diphenylphosphinothioyl)ferrocene is being used as a convenient building block to obtain racemic or enantiomerically pure ligands. Using this building block in large excess allowed the formation of several by-products, two of which have already been reported; the structure of a third by-product, namely 1-(diphenylphosphinothioyl)-2-{[(diphenylphosphinothioyl)sulfanyl]methyl}ferrocene, [Fe(C5H5)(C30H25P2S3)], is presented here. The crystal structure is built up from a ferrocene unit, with one of the cyclopentadienyl (Cp) rings substituted in the 1- and 2-positions by a protected diphenylphosphinothioyl group and a [(diphenylphosphinothioyl)sulfanyl]methyl fragment, -CH2SP(=S)Ph2. There are C-H...S interactions which result in the formation of chains parallel to the c axis. After desulfurization, the crude material was then reacted with Pd and Pt (M) precursors [MCl2(CH3CN)2] to yield two isostructural dinuclear complexes arranged around twofold axes, namely (R,R/S,S)-bis{μ-[2-(diphenylphosphanyl)ferrocen-1-yl]methanethiolato-κ(3)P,S:S}bis[chloridopalladium(II)] pentane disolvate, [Pd2{Fe(C5H5)(C18H15PS)}2Cl2]·2C5H12, and the platinum(II) analogue, (R,R/S,S)-bis{μ-[2-(diphenylphosphanyl)ferrocen-1-yl]methanethiolato-κ(3)P,S:S}bis[chloridoplatinum(II)] toluene monosolvate, [Pt2{Fe(C5H5)(C18H15PS)}2Cl2]·C7H8, in which the two metal atoms present a slightly distorted square-planar geometry formed by two bridging S atoms and P and Cl atoms. The P,S-chelating ligand results from the rupture of one of the P-S bonds in the starting ligand. These dinuclear complexes display a butterfly geometry. Surprisingly, only the (R,R/S,S) diastereoisomer has been isolated.