In the title complex mol-ecule, [Cd(C13H11N4O2)2], the Cd atom is coordinated in a distorted octa-hedral geometry by two tridentate ligands synthesized from 2-hy-droxy-benzohydrazide and 1-(pyrazin-2-yl)ethan-1-one. The mol-ecule has twofold crystallographic symmetry and is isomorphous to its Mn, Co, Ni, Cu and Zn counterparts.The square-planar nickel(II) title complex, [Ni(C24H36F2N6)](ClO4)2 or [NiL](ClO4)2 (L = 3,10-bis-(4-fluoro-pheneth-yl)-1,3,5,8,10,12-hexa-aza-cyclo-tetra-deca-ne) was synthesized by a one-pot reaction of template condensation and its X-ray crystal structure was determined. The nickel(II) ion lies close by a twofold axis and the complex displays whole-mol-ecule disorder. Ligand L, a hexa-aza-cyclo-tetra-decane ring having 4-fluoro-phenethyl side chains attached to uncoordinated nitro-gen atoms, adopts a trans III (R,R,S,S) configuration. The average Ni-N bond distance is 1.934 (9) Å, which is quite similar to those of other nickel(II) complexes with similar ligands. The nickel(II) ion is located 0.051 (7) Å above the least-squares plane through the four coordinated N atoms. The average C-N bond distance and C-N-C angle involving uncoordinated nitro-gen atoms are 1.425 (12) Å and 118.0 (9)°, respectively, indicating a significant contribution of sp 2 hybridization for these N atoms. The inter-molecular N-H⋯O, C-H⋯O/F hydrogen bonds of the complex form a network structure, which looks like a seamless floral lace pattern.8-Nitro-1,3-benzo-thia-zin-4-ones are a promising class of new anti-tubercular agents, two candidates of which, namely BTZ043 and PBTZ169 (INN macozinone), have reached clinical trials. The crystal and mol-ecular structures of two synthetic precursors, 2-chloro-3-nitro-5-(tri-fluoro-meth-yl)benzoic acid, C8H3ClF3NO4 (1), and 2-chloro-3-nitro-5-(tri-fluoro-meth-yl)benzamide, C8H4ClF3N2O3 (2), are reported. In 1 and 2, the respective carb-oxy, carboxamide and the nitro groups are significantly twisted out of the plane of the benzene ring. In 1, the nitro group is oriented almost perpendicular to the benzene ring plane. In the crystal, 1 and 2 form O-H⋯O and N-H⋯O hydrogen-bonded dimers, respectively, which in 2 extend into primary amide tapes along the [101] direction. The tri-fluoro-methyl group in 2 exhibits rotational disorder with an occupancy ratio of 0.876 (3)0.124 (3).The title compound, C12H9N3O4S, synthesized by condensation of 5-nitro-thio-phene-2-carbaldehyde and 2-methyl-3-nitro-aniline, crystallizes in the ortho-rhom-bic space group P212121. In the mol-ecule, the aromatic benzene and thio-phene rings are twisted with respect to each other, making a dihedral angle of 23.16 (7)°. In the crystal, mol-ecules are linked by inter-molecular C-H⋯O hydrogen bonds into chains extending along the c-axis direction. Weak π-π stacking inter-actions along the a-axis direction provide additional stabilization of the crystal structure. The roles of the various inter-molecular inter-actions were clarified by Hirshfeld surface analysis, which reveals that the crystal packing is dominated by O⋯H (39%) and H⋯H (21.3%) contacts. The crystal studied was refined as a two-component inversion twin.The asymmetric unit of the title compound, sodium 2-[1-methyl-5-(4-methyl-benzo-yl)-1H-pyrrol-2-yl]acetate dihydrate, Na+·C15H14NO3 -·2H2O, contains two sodium cations, two organic anions (A and B) and two water mol-ecules. The coordination geometry around the sodium cations corresponds to a distorted octa-hedron. Each pair of sodium cations (A-A or B-B) is chelated by two bridging anions coordinated by the O atoms of the deprotonated carb-oxy-lic groups, and each sodium atom is coordinated by an O atom of a third anion, which connects pairs of sodium atoms, and a water mol-ecule. LYN-1604 As a result, a two-dimensional polymer is formed in the crystal. Hirshfeld surface analysis and two-dimensional fingerprint plots were used to analyze the inter-molecular contacts present in the crystal.The title compound (E)-1,3-dimethyl-2-[3-(4-nitro-phen-yl)triaz-2-enyl-idene]-2,3-di-hydro-1H-imidazole, C11H12N6O2, has monoclinic (C2/c) symmetry at 100 K. This triazene derivative was synthesized by the coupling reaction of 1,3-di-methyl-imidazolium iodide with 1-azido-4-nitro benzene in the presence of sodium hydride (60% in mineral oil) and characterized by 1H NMR, 13C NMR, IR, mass spectrometry, and single-crystal X-ray diffraction. The mol-ecule consists of six-membered and five-membered rings, which are connected by a triazene moiety (-N=N-N-). In the solid-state, the mol-ecule is found to be planar due to conjugation throughout the mol-ecule. The extended structure shows two layers of mol-ecules, which present weak inter-molecular inter-actions that facilitate the stacked arrangement of the mol-ecules forming the extended structure. Furthermore, there are several weak pseudo-cyclical inter-actions between the nitro oxygen atoms and symmetry-adjacent H atoms, which help to arrange the mol-ecules.The title mol-ecule, C20H20B2F4N4, assumes a planar conformation with all atoms apart from the F atoms lying on the symmetry plane. Each boron atom is four-coordinated by two fluorine atoms, a pyrrole N atom and an imine N atom. Both imine CH=N groups adopt a trans conformation. In the crystal, the mol-ecules self-assemble into a pillar structure through C-H⋯F hydrogen bonds and π-π inter-actions. The UV-vis spectrum and fluorescence spectra of the title compound are also reported.In the title mol-ecule, C28H27N3O3S, the heterocyclic portion of the tetra-hydro-iso-quinoline unit is planar and an intra-molecular N-H⋯N hydrogen bond and a C-H⋯π(ring) inter-action help to determine the overall conformation. In the crystal, a layer structure with the layers parallel to (10) is generated by O-H⋯O and C-H⋯O hydrogen bonds.The title compound, C30H39N3·0.5C7H8, is a symmetrically N,N'-disubstituted aryl-amidine containing a 4-pyridyl substituent on the carbon atom of the N-C-N linkage and bulky 2,6-diiso-propyl-phenyl groups on the nitro-gen atoms. It crystallizes in the Z-anti configuration and its amidine C-N bonds present amine [1.368 (1) Å] and imine [1.286 (1) Å] features. Intra-molecular hydrogen bonds are present in the structure together with inter-molecular N-H⋯N and C-H⋯N inter-actions linking the mol-ecules in chains along the a- and c-axis directions.