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The crystal structure of the title complex features O—H⋯O hydrogen bonds, which form

The title complex, [Cu(C₈H₁₈NO₅)Cl] or [Cu(H₄bis-tris­)Cl], was obtained starting from the previously reported [Cu(H₅bis-tris­)Cl]Cl compound. The deprotonation of the amino­polyol ligand H₅bis-tris {[bis­(2-hy­droxy­eth­yl)amino]­tris­(hy­droxy­meth­yl)methane, C₈H₁₉NO₅} promotes the formation of a very strong O—H⋯O inter­molecular hydrogen bond, characterized by an H⋯O separation of 1.553 (19) Å and an O—H⋯O angle of 178 (4)°. The remaining hy­droxy groups are also engaged in hydrogen bonds, forming R ₂ ²(8), R ₄ ⁴(16), R ₄ ⁴(20) and R ₄ ⁴(22) ring motifs, which stabilize the triperiodic supra­molecular network.

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The mol­ecule of the title NC_NHCS pincer N-heterocyclic carbene palladium(II) complex, [PdBr(C₂₁H₂₅N₃S)]Br, exhibits a slightly distorted square-planar coordination at the palladium(II) atom, with the five-membered chelate ring nearly planar. The six-membered chelate ring adopts an envelope conformation. Upon chelation, the sulfur atom becomes a stereogenic centre with an R S configuration induced by the chiral carbon of the precursor imidazolium salt.

The mol­ecule of the title NC_NHCS pincer N-heterocyclic carbene palladium(II) complex, [PdBr(C₂₁H₂₅N₃S)]Br, exhibits a slightly distorted square-planar coordination at the palladium(II) atom, with the five-membered chelate ring nearly planar. The six-membered chelate ring adopts an envelope conformation. Upon chelation, the sulfur atom becomes a stereogenic centre with an R S configuration induced by the chiral carbon of the precursor imidazolium salt. There are intra­molecular C—H⋯Br—Pd hydrogen bonds in the structure. The two inter­stitial Br atoms, as the counter-anion of the structure, are both located on crystallographic twofold axes and are connected to the complex cations via C—H⋯·Br hydrogen bonds.

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The title compound is a di­aza­borinane featuring substitution at the 1, 2, and 3 positions of the nitro­gen–boron six-membered heterocycle. In the crystal, mol­ecules are stacked in a head-to-tail manner. The iodide ion makes close contacts with three organic mol­ecules and supports the alternating stack.

The title compound, C₁₇H₁₇BN₃I, is a type of di­aza­borinane featuring substitution at the 1, 2, and 3 positions of the nitro­gen–boron six-membered heterocycle. The organic mol­ecule has a planar structure, the dihedral angle between the pyridyl ring and the fused ring system being 3.46 (4)°. In the crystal, mol­ecules are stacked in a head-to-tail manner. The iodide ion makes close contacts with three organic mol­ecules and supports the alternating stack.

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The structure of bis­[2,3-bis­(thio­phen-2-yl)pyrido[3,4-b]pyrazine]­silver(I) perchlorate methanol disolvate is monoclinic. The Ag atom coordinates pyrido N atoms and is two-coordinate; however, the Ag atom has nearby O atoms that can be assumed to be weakly bonding – one from the perchlorate anion and one from the methanol solvate. One of the thienyl groups of a 2,3-bis­(thio­phen-2-yl)pyrido[3,4-b]pyrazine is flipped disordered and was refined to occupancies of 68.4 (6) and 31.6 (6)%.

The title compound, [Ag(C₁₅H₉N₃S₂)₂]ClO₄·2CH₃OH, is monoclinic. The Ag^I atom is coordinated by pyrido N atoms and is two-coordinate; however, the Ag^I atom has nearby O atoms that can be assumed to be weakly bonded – one from the perchlorate anion and one from the methanol solvate molecule. One of the thienyl groups on a 2,3-bis­(thio­phen-2-yl)pyrido[3,4-b]pyrazine is flipped disordered and was refined to occupancies of 68.4 (6) and 31.6 (6)%.

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The title compound crystallizes in the non-centrosymmetric ortho­rhom­bic space group Fdd2, with 16 mol­ecules in the unit cell. In the crystal, aromatic π–π stacking distance and short C—H⋯O contacts are observed.

In the title compound, C₂₂H₁₁N₃O₃S, dihedral angle between the phenyl rings on the periphery of the molecule is 8.05 (18)°. In the crystal, aromatic π–π stacking distance and short C—H⋯O contacts are observed. The maximum absorption occurs at 688 nm.

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The title compound crystallizes in space group P2₁/c with four mol­ecules in the asymmetric unit.

The title compound, C₂₂H₁₂N₂S₂, crystallizes in space group P2₁/c with four mol­ecules in the asymmetric unit. The heterocyclic mol­ecule is quasi-planar with a dihedral angle between the phenyl rings on the periphery of the mol­ecule of 1.73 (19)°. Short H⋯S (2.92 Å) and C—H⋯π [2.836 (3) Å] contacts are observed in the crystal with shorted π–π stacking distances of 3.438 (3) Å along the b axis. Surprisingly, and unlike a closely related material, this mol­ecule readily forms large crystals by sublimation and by slow evaporation from di­chloro­methane. The maximum absorbance in the UV-Vis spectrum is at 533 nm. Emission was measured upon excitation at 533 nm with a fluorescence λ_max of 658 nm and cutoff of 900 nm.

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The title compound features bifurcated template-to-framework N—H⋯(O,O) hydrogen bonds.

In the title compound, {(C₆H₈N)[Zn₂(HPO₃)₂(H₂PO₃)]}_n, the constituent ZnO₄, HPO₃ and H₂PO₃ polyhedra of the inorganic component are linked into (010) sheets by Zn—O—P bonds (mean angle = 134.4°) and the layers are reinforced by O—H⋯O hydrogen bonds. The protonated templates are anchored to the inorganic sheets via bifurcated N—H⋯(O,O) hydrogen bonds.

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The title complex exhibits a distorted octa­hedral geometry about the metal centre, which coordinates two tridentate ligands that are perpendicular to each other.

In the title compound, [Ni(C₁₃H₁₃N₄S)₂]·0.33CH₃OH·0.67H₂O, the Ni^II atom is coordinated by two tridentate quinoline-2-carboxaldehyde 4-ethyl­thio­semi­car­ba­zonate ligands in a distorted octa­hedral shape. At 100 K, the crystal symmetry is monoclinic (space group P2₁/n). A mixture of water and methanol crystallizes with the title complex, and one of the ethyl groups in the coordinating ligands is disordered over two positions, with an occupancy ratio of 58:42. There is inter­molecular hydrogen bonding between the solvent mol­ecules and the amine and thiol­ate groups in the ligands. No other significant inter­actions are present in the crystal packing.

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The crystal structure of a new ethidium salt has been determined. Two ethidium cations self-associate to form a dimer through π–π inter­actions.

In the title salt solvate (systematic name: 8-amino-5-ethyl-6-phenyl­phenanthridin-5-ium benzoate methanol monosolvate), C₂₁H₂₀N₃ ⁺·C₆H₅CO₂ ⁻·CH₃OH, two ethidium cations, C₂₁H₂₀N₃ ⁺, dimerize about a twofold axis through π–π inter­actions [inter-centroid separation = 3.6137 (4) Å]. The benzoate anions are connected through hydrogen bonding with the –NH₂ groups of the ethidium cations and the –OH group of the MeOH mol­ecule. The MeOH mol­ecule also accepts a hydrogen bond from the –NH₂ group of the ethidium cation. The result is a one-dimensional hydrogen-bonded chain along the b-axis direction.

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The π-conjugated planar title mol­ecules are assembled through C—H⋯π inter­actions between neighboring mol­ecules, resulting in stacking along the c-axis.

The title compound, C₂₂H₂₄N₂O₂, crystallizes in space group P2₁/n. The mol­ecular structure is almost planar except for a tilt of the phenyl rings. The allyl groups on both ends exhibit the trans-form and the connected N atoms show sp ² character. The mol­ecules are stacked and assembled along the c-axis direction by C—H⋯π inter­actions.

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