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In the title compound, the pyridyl ring and the Bdan (dan = 1,8-di­aminona­phto) group subtend a dihedral angle of 24.57 (5)°. In the crystal, the mol­ecules make

The title compound, C₁₅H₁₂BN₃, is a type of di­aza­borinane featuring substitution at 1, 2, and 3 positions in the nitro­gen–boron six-membered heterocycle. It is comprised of two almost planar units, the pyridyl ring and the Bdan (dan = 1,8-di­aminona­phtho) group, which subtend a dihedral angle of 24.57 (5)°. In the crystal, the mol­ecules are linked into R₄⁴(28) hydrogen-bonding networks around the fourfold inversion axis, giving cyclic tetra­mers. The mol­ecules form columnar stacks along the c axis.

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The title compound consists of an octa­hedral iron(II) cation coordinated to two water mol­ecules (trans) with four tetra­hydro­furan (THF) ligands. Two additional THF mol­ecules are hydrogen bonded to each of the water mol­ecules. The dianion of the title compound is an organometallic butterfly complex with a di­methyl­siloxane core and two iron-gallium fragments.

The title compound, [Fe(C₄H₈O)₄(H₂O)₂][Fe₄Ga₄(C₂H₆O₂Si)Cl₄(CO)₁₅]·4C₄H₈O, consists of an iron(II) cation octa­hedrally coordinated by two water mol­ecules (trans) with four tetra­hydro­furans (THF) at equatorial sites. Two additional THF mol­ecules are hydrogen bonded to each of the water mol­ecules. The dianion of the title compound is an organometallic butterfly complex with a dimethyl siloxane core and two iron-gallium fragments. The lengths of the iron to gallium metal–metal bonds range from 2.3875 (6) to 2.4912 (6) Å.

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The porphyrin macrocycle shows a characteristic ruffled-shape distortion. The central Fe^III cation (site symmetry 2) is coordinated in a fivefold manner, with four pyrrole N atoms of the porphyrin core in the basal sites and one Cl atom (site symmetry 2) in the apical position.

The title compound, [Fe(C₈₄H₅₂N₁₂O₄)Cl], crystallizes in space group C2/c. The central Fe^III cation (site symmetry 2) is coordinated in a fivefold manner, with four pyrrole N atoms of the porphyrin core in the basal sites and one Cl atom (site symmetry 2) in the apical position, which completes a slightly distorted square-pyramidal environment. The porphyrin macrocycle shows a characteristic ruffled-shape distortion and the iron atom is displaced out of the porphyrin plane by 0.42 Å with the average Fe—N distance being 2.054 (4) Å; the Fe—Cl bond length is 2.2042 (7) Å. Inter­molecular C—H⋯N and C—H⋯O hydrogen bonds occur in the crystal structure.

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The title triazole-based N-heterocyclic carbene iridium(I) cationic complex with a tetra­fluorido­borate counter-anion, crystallizes with two cations and two anions in the asymmetric unit. In the extended structure, non-classical C–H⋯F hydrogen bonds, one of which is notably short (H⋯F = 2.21 Å), link the cations and anions.

The title compound, [Ir(C₈H₁₂)(C₈H₁₅N₃)(C₁₈H₁₅P)]BF₄, a new triazole-based N-heterocyclic carbene iridium(I) cationic complex with a tetra­fluorido­borate counter-anion, crystallizes with two cations and two anions in the asymmetric unit of space group Pc. The Ir centers of the cations have distorted square-planar conformations, formed by a bidentate (η² + η²) cyclo­octa-1,5-diene (COD) ligand, an N-heterocyclic carbene and a tri­phenyl­phosphane ligand with the NHC carbon atom and P atom being cis. In the extended structure, non-classical C–H⋯F hydrogen bonds, one of which is notably short (H⋯F = 2.21 Å), link the cations and anions. The carbon atoms of one of the COD ligands are disordered over adjacent sites in a 0.62:0.38 ratio.

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The title complex exhibits a distorted octa­hedral geometry about the cobalt centre. The divalent cobalt ion is surrounded by three aceto­nitrile solvento ligands and one tridentate tacn ligand.

The title cobalt(II) complex, [Co(C₂H₃N)₃(C₉H₂₁N₃)](C₂₄H₂₀B)₂ or [(tacn)Co(NCMe)₃][BPh₄]₂, has been characterized by single-crystal X-ray diffraction. It incorporates the well-known macrocyclic tacn (1,4,7-trimethyl-1,4,7-tri­aza­cyclo­nona­ne) ligand, which is coordinated facially to the metal center. The complex crystallizes in space group P2₁/c with Z = 4. The divalent cobalt ion exhibits a six-coordinate octa­hedral geometry by one tacn and three aceto­nitrile ligands. Two non-coordinating tetra­phenyl­borate (BPh₄⁻) anions are also present.

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The crystal structure of the title complex is stabilized by inter­molecular O—H⋯Cl hydrogen bonds, forming

The use of acetic acid (HOAc) in a reaction between CuCl₂·2H₂O and secnid­azole, an active pharmaceutical ingredient useful in the treatment against a variety of anaerobic Gram-positive and Gram-negative bacteria, affords the title complex, [CuCl₂(C₇H₁₁N₃O₃)₂]. This compound was previously synthesized using ethanol as solvent, although its crystal structure was not reported [Betanzos-Lara et al. (2013#). Inorg. Chim. Acta, 397, 94–100]. In the mol­ecular complex, the Cu²⁺ cation is situated at an inversion centre and displays a square-planar coordination environment. There is a hydrogen-bonded framework based on inter­molecular O—H⋯Cl inter­actions, characterized by H⋯Cl separations of 2.28 (4) Å and O—H⋯Cl angles of 175 (3)°. The resulting supra­molecular network is based on R 22(18) ring motifs, forming chains in the [010] direction.

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In the structure of the title complex, the zinc(II) ion forms coordination bonds with the four nitro­gen atoms of cyclam as well as with the nitro­gen atom of a deprotonated 5-fluoro­uracil ion. Cyclam adopts a trans-I type conformation within this structure. The coordination structure of the zinc(II) ion is a square pyramid with a distorted base plane formed by the four nitro­gen atoms of the cyclam.

In the structure of the title complex, [Zn(C₄H₂FN₂O₂)(C₁₀H₂₄N₄)]ClO₄, the zinc(II) ion forms coordination bonds with the four nitro­gen atoms of cyclam (1,4,8,11-tetra­aza­cyclo­tetra­decane or [14]aneN4) as well as with the nitro­gen atom of a deprotonated 5-fluoro­uracil ion (FU⁻). Cyclam adopts a trans-I type conformation within this structure. The coordination structure of the zinc(II) ion is a square pyramid with a distorted base plane formed by the four nitro­gen atoms of the cyclam. FU⁻ engages in inter­molecular hydrogen bonding with neighboring FU⁻ mol­ecules and with the cyclam mol­ecule.

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The N—H group of the title compound does not form a hydrogen bond due to steric hindrance.

In the title compound, C₂₆H₁₈BrN, the central benzene ring makes dihedral angles with its adjacent anthracene ring system and pendant benzene ring of 87.49 (13) and 62.01 (17)°, respectively. The N—H moiety is sterically blocked from forming a hydrogen bond, but weak C—H⋯π inter­actions occur in the extended structure.

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The mol­ecule is a zwitterion, with a protonated α-amino group and a deprotonated α-carboxyl group. Within the crystal, the mol­ecules are linked by a system of hydrogen bonds formed by both the protonated and deprotonated carb­oxy­lic groups, and the protonated ammonium group.

The title compound {systematic name: (2S)-2-aza­niumyl-3-[(2-carb­oxy­ethane)­sulfon­yl]propano­ate}, C₆H₁₁NO₆S, forms enanti­opure crystals in the monoclinic space group P2₁ and exists as a zwitterion, with a protonated α-amino group and a deprotonated α-carboxyl group. Both the carboxyl groups and the amino group are involved in an extensive multicentered inter­molecular hydrogen-bonding scheme. In the crystal, the diperiodic network of hydrogen bonds propagates parallel to (101) and involves inter­connected heterodromic R ₄ ³(10) rings. Electrostatic forces are major contributors to the structure energy, which was estimated by DFT calculations as E _total = −333.5 kJ mol⁻¹.

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Na₂(Fe_2/3Te_4/3)O₆ was obtained under hydro­thermal conditions and adopts the ilmenite (FeTiO₃) structure type.

Na₂(Fe_2/3Te_4/3)O₆ (Z = 3) or Na₃(FeTe₂)O₉ (Z = 2), tris­odium iron(III) ditellurium(VI) nona­oxide, adopts the ilmenite (FeTiO₃, Z = 6) structure type with the Ti site (site symmetry 3.) replaced by Na and the Fe site (site symmetry 3.) replaced by a mixed-occupied (Fe^III,Te^VI) site in a Fe:Te ratio of 1:2. Whereas the [(Fe,Te)O₆] octa­hedron is only slightly distorted, the [NaO₆] octa­hedron shows much stronger distortions, as revealed by a larger spread of the bond lengths and some distortion parameters.

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