trans‐Dichloro­tetra­benzimidazole­cadmium(II) tetra­benzimidazole: a three‐dimensional supra­molecular structure built from C—H⋯π, N—H⋯Cl and N—H⋯N hydrogen bonds

The title compound, [CdCl₂(C₇H₆N₂)₄]·4C₇H₆N₂, consists of a Cd(Bzim)₄Cl₂ complex (Bzim is benzimidazole) lying on a fourfold rotation axis in the space group P4nc, and four benzimidazole mol­ecules which are linked to the coordinated benzimidazole unit by N—H⋯N hydrogen bonds. One N—H⋯Cl and three C—H⋯π hydrogen bonds link these units into a three‐dimensional supra­molecular structure.     

cis‐Dinitrito(1,4,8,11‐tetra­aza­cyclo­tetra­decane‐κ4N)­chromium(III) nitrite

In the title compound, [Cr(ONO)₂(cyclam)]NO₂ (cyclam is 1,4,8,11‐tetra­aza­cyclo­tetra­decane, C₁₀H₂₄N₂), the complex cation is located on a twofold symmetry axis. The central Cr atom has a distorted octahedral coordination, involving two Cr—O bonds, with the monodentate nitrite O atoms adopting a cis configuration, and four Cr—N bonds. The mean Cr—N and Cr—O distances are 2.0895 (14) and 1.9698 (14) Å.     

2‐Amino‐4,6‐bis(benzyloxy)‐5‐nitrosopyrimidine: chains built from three‐centre N—H⋯(N,O) and N—H⋯π(arene) hydrogen bonds

The molecules of the title compound, C₁₈H₁₆N₄O₃, exhibit a very polarized molecular–electronic structure. The mol­ecules are linked into chains by a combination of an asymmetric three‐centre N—H?(N,O) hydrogen bond [H?N 2.19, H?O 2.54, N?N 3.041 (4) and N?O 2.977 (4) Å, and N—H?N 168, N—H?O 112 and N?H?O 67°] and an N—H?π(arene) interaction [H?Cg 2.67 Å, N?Cg 3.496 (4) Å and N—H?Cg 163°; Cg is a benzyl ring centroid].     

Strong intramolecular O—H⋯O hydrogen bonds in quinaldic acid N‐oxide and picolinic acid N‐oxide

The title compounds contain very short intramolecular hydrogen bonds of the type C—O—H?O—N. The O?O distances are 2.425 (2) Å in picolinic acid N‐oxide (2‐carboxy­pyridine N‐oxide), C₆H₅NO₃, (I), and 2.435 (2) Å in quinaldic acid N‐oxide (2‐carboxy­quinoline N‐oxide), C₁₀H₇NO₃, (II). In (II), this is associated with slight molecular distortion from planarity, while in (I), such an effect cannot be observed because the mol­ecule crystallizes on a mirror plane.     

2‐Amino­benzimidazolium O‐ethyl malonate: eight independent N—H⋯O hydrogen bonds generate sheets

The title compound, C₇H₈N₃⁺·C₅H₇O₄⁻, crystallizes with Z′ = 2 in space group P2₁/c; eight independent N—H⋯O hydrogen bonds [H⋯O = 1.75–1.88 Å, N⋯O = 2.699 (2)–2.829 (2) Å and N—H⋯O = 147–179°] link the four inde­pendent ions into sheets.     

(12‐Hydro­xy­methyl‐5,5,7,12,14‐penta­methyl‐1,4,8,11‐tetra­aza­cyclo­tetra­decane‐N‐acetato‐N,N′,N′′,N′′′,O,O′)cobalt(III) chloride perchlorate monohydrate

In the title compound, [Co(C₁₈H₃₇N₄O₃)](ClO₄)Cl·H₂O, the Co^III ion has a distorted octahedral geometry, with four N atoms and two O atoms constituting the coordination sphere. The crystal structure is stabilized by a three‐dimensional network of hydrogen bonds.     

Ethyl N‐(2‐benzyl­amino‐6‐benzyl­oxy‐5‐nitro­sopyrimidin‐4‐yl)­glycinate: sheets built from a three‐centre N—H⋯(N,O), and two‐centre C—H⋯O and C—H⋯π(arene) hydrogen bonds

In the title compound, C₂₂H₂₃N₅O₄, the mol­ecules are linked into chains by a three‐centre N—H?(N,O) hydrogen bond, reinforced by a two‐centre C—H?O hydrogen bond, and the chains are further linked into sheets by a combination of C—H?O and C—H?π(arene) hydrogen bonds.     

cis‐Diaqua­bis[(E)‐4‐(2‐hydroxy­benzyl­idene­amino)benzoato‐κ2O,O′]cadmium(II): two‐dimensional layers built from strong O—H⋯O hydrogen bonding in the coordination sphere

In the title compound, [Cd(C₁₄H₁₀NO₃)₂(H₂O)₂], which crystallizes with Z = 4 in the space group C2c, the Cd atom is located on a twofold rotation axis and coordinated by six O atoms from two water mol­ecules and two carboxylate groups of two planar 4‐(2‐hydroxy­benzyl­idene­amino)­benzoate lig­ands, with a dihedral angle of 85.6 (1)° between them. Strong O—H⋯O hydrogen bonding in the coordination sphere, together with π–π stacking inter­actions, assemble the mol­ecules into two‐dimensional layers.     

Bis(4‐nitro­phenyl) di­sulfide at 150 K,a three‐dimensional framework built from C—H⋯O hydrogen bonds and aromatic π⋯π stacking interactions

In the title compound, (4‐O₂NC₆H₄)₂S₂ or C₁₂H₈N₂O₄S₂, the mol­ecules lie across twofold rotation axes. A single type of C—H?O hydrogen bond, with C?O = 3.394 (3) Å and C—H?O = 158°, links the mol­ecules into continuous two‐dimensional sheets built from a single type of R⁴₄(44) ring. These sheets are linked by aromatic π?π stacking interactions to form a continuous three‐dimensional framework.     

O—H⋯O‐bridged dimers linked via C—H⋯O and C—H⋯π inter­actions in 4,6‐di‐O‐benzyl‐myo‐inositol 1,3,5‐orthoformate

The centrosymmetric O—H⋯O‐bonded head‐to‐head dimers of the title compound, C₂₁H₂₂O₆, are linked together via bifurcated C—H⋯O inter­actions along the a axis and via favourable C—H⋯π inter­actions along the b axis in the crystal structure.     

cis‐Diaqua­[(E)‐2‐(2‐oxidobenzyl­idene­amino‐κ2N,O)­benzoato‐κO]copper(II): tubes built from O—H⋯O hydrogen‐bonding, π–π and C—H⋯π inter­actions

In the title compound, [Cu(C₁₄H₉NO₃)(H₂O)₂], which crystallizes with Z = 18 in the space group R, pairs of complexes are linked into dimers by three O—H⋯O hydrogen bonds. Strong O—H⋯O hydrogen bonds link the dimers into one‐dimensional chains that further assemble into tubes through π–π and C—H⋯π inter­actions.     

(μ‐C‐meso‐5,5,7,12,12,14‐Hexa­methyl‐1,4,8,11‐tetra­aza­cyclo­tetra­decane‐N‐acetato‐1κ5N,N′,N′′,N′′′,O:2κO′)­tetra­chloro‐1κCl,2κ3Cl‐cobalt(III)­zinc(II)

The crystal structure of the title compound, [CoCl(C₁₈H₃₇N₄O₂){ZnCl₃}], has been determined by X‐ray diffraction.C‐meso‐5,5,7,12,12,14‐Hexa­methyl‐1,4,8,11‐tetra­aza­cyclotetradecane‐N‐acetate acts as a bridging ligand to coodinate with Co^III and Zn^II ions. The Co^III ion is six‐coordinate in a nearly octahedral environment provided by one Cl atom, four N atoms of the bridging ligand, and one O atom. The Zn^II ion is four‐coordinate in a distorted tetrahedral environment completed by three Cl atoms and an O atom of the bridging ligand.     

NiII and ZnII complexes of the hexadentate macrocyclic ligand cis‐6,13‐di­methyl‐1,4,8,11‐tetra­aza­cyclo­tetra­decane‐6,13‐di­amine

The title pendent‐arm macrocyclic hexa­amine ligand binds stereospecifically in a hexadentate manner, and we report here its isomorphous Ni^II and Zn^II complexes (both as perchlorate salts), namely (cis‐6,13‐di­methyl‐1,4,8,11‐tetra­aza­cyclo­tetra­decane‐6,13‐di­amine‐κ⁶N)­nickel(II) di­per­chlorate, [Ni(C₁₂H₃₀N₆)]­­(ClO₄)₂, and (cis‐6,13‐di­methyl‐1,4,8,11‐tetraaza‐cyclo­tetra­decane‐6,13‐di­amine‐κ⁶N)­zinc(II) di­per­chlorate, [Zn(C₁₂H₃₀N₆)]­(ClO₄)₂. Distortion of the N—M—N valence angles from their ideal octahedral values becomes more pronounced with increasing metal‐ion size and the present results are compared with other structures of this ligand.     

trans‐Di­aqua(C‐meso‐5,12‐di­methyl‐1,4,8,11‐tetra­aza­cyclo­tetra­decane‐N,N′,N′′,N′′′)copper(II) dichloride dihydrate

The crystal structure of the title complex, [Cu(C₁₂H₂₈N₄)(H₂O)₂]Cl₂·2H₂O, has been determined. The Cu^II atom is octahedrally coordinated by the four N atoms of the tetradentate macrocyclic ligand in equatorial positions and by the O atoms of two water mol­ecules in axial positions. The crystal structure is stabilized by a three‐dimensional network of hydrogen bonds.     

trans‐Di­chloro(1,5,9,13‐tetra­methyl‐1,5,9,13‐tetr­aza­cyclo­hexa­decane‐κ4N)ruthenium(III) triiodide

In the title complex, [RuCl₂(C₁₆H₃₆N₄)]I₃, the overall symmetry of the centrosymmetric cation is approximately C_2h and the I anions are slightly asymmetric. The I?I distance is 4.313 (1) Å. The cations and the linear anions are arranged in alternate layers and thus form the intercalating structure.     

2,4‐Bis[1‐(4‐hydroxyphenyl)‐1‐methylethyl]phenol: a three‐dimensional framework built from O—H...O hydrogen bonds

In the crystal structure of the title compound, C₂₄H₂₆O₃, (I), there are three different O—H...O hydrogen bonds, which individually form chains of C(10), C(12) and C(16) types. The combined effect of all these hydrogen bonds is the formation of a three‐dimensional network, which is additionally stabilized by a single intermolecular C—H...π interaction. The significance of this study lies in the comparison drawn between the molecular structure of (I) and those of several of its analogues, which shows a close similarity in the almost perpendicular orientation of the benzene rings.     

Di‐μ‐hydro­xo‐bis­(diiso­propyl­gallium)–1,4,8,11‐tetra­methyl‐1,4,8,11‐tetra­aza­cyclo­tetra­decane (1/1)

The hydro­lysis product [Ga₂(C₃H₇)₄(OH)₂]·C₁₄H₃₂N₄, derived from the tetrakis­(triiso­propyl­gallium)–1,4,8,11‐tetra­methyl‐1,4,8,11‐tetra­aza­cyclo­tetra­decane (1/1) adduct, consists of a centrosymmetric [ⁱPr₂Ga(μ‐OH)]₂ unit hydrogen bonded through the hydroxyl group to a nitro­gen on an adjacent centrosymmetric 1,4,8,11‐tetra­methyl‐1,4,8,11‐tetra­aza­cyclo­tetra­decane molecule, resulting in the generation of a molecular chain through the crystal.     

4‐(Allyl­amino)‐2‐amino‐6‐benzyl­oxy‐5‐nitro­so­pyrimidine from synchrotron data at 150 K: double chains built from N—H⋯N,N—H⋯O,N—H⋯π(arene) and aromatic π–π‐stacking interactions

In the title compound, C₁₄H₁₅N₅O₂, the intramolecular dimensions are consistent with a highly polarized electronic structure. The mol­ecules are linked into chains by a combination of N—H?N, N—H?O and N—H?π(arene) hydrogen bonds, and the chains are linked in pairs by aromatic π–π‐stacking interactions