(E)-1-(4-Chloro-benzyl-idene)thio-semi-carbazide

In the crystal of the title compound, C₈H₈ClN₃S, mol­ecules are connected by N—H⋯S hydrogen bonds into strips parallel to the (112) planes and running along [10]. One of the amino H atoms is not involved in a classical hydrogen bond. In addition, there is a rather short inter­molecular Cl⋯S distance of 3.3814 (5) Å.

2,6-Bis(2-methyl-1,3-diazinan-2-yl)pyridine

The title compound, C₁₅H₂₅N₅, is an aminalization product between 2,6-diacetyl­pyridine and 1,3-diamino­propane. It crystallizes with two independent mol­ecules in the asymmetric unit with different conformations. In the first mol­ecule, the methyl groups are cis oriented with respect to the pyridine ring [N—C—C—C torsion angles = 72.5 (1) and 80.3 (1)°], while they are trans oriented in the second mol­ecule [N—C—C—C torsion angles = 82.6 (1) and −90.8 (1)°]. Each of the two mol­ecules forms centrosymmetric dimers held together by N—H⋯N hydrogen bonds, thus forming R₂²(16) rings. The two dimers are inter­linked by additional N—H⋯N bonds into R₄⁴(14) rings, building chains along the a axis. These patterns influence the orientation (either equatorial or axial) of the N—H bonds.

A monoclinic modification of propane-1,3-diyl bis-(pyridine-3-carboxyl-ate)

In the title compound, C₁₅H₁₄N₂O₄, (I), the mol­ecule lies on a twofold rotation axis which passes through the central C atom of the aliphatic chain, giving one half-mol­ecule per asymmetric unit. The structure is a monoclinic polymorph of the triclinic structure previously reported [Brito, Vallejos, Bolte & López-Rodríguez (2010). Acta Cryst. E66, o792], (II). The most obvious difference between them is the O/C/C/C—O/C/C/C torsion angle [58.2 (7)° in (I) and 173.4 (3)/70.2 (3)° in (II) for GG and TG conformations, respectively]. Another important difference is observed in the dihedral angle between the planes of the aromatic rings [86.49 (7)° for (I) and 76.4 (3)° for (II)]. The crystal structure features a weak π–π inter­action [centroid–centroid distance = 4.1397 (10)Å]; this latter kind of inter­action is not evident in the triclinic polymorph.

Tetra-μ(3)-tert-butano-lato-tetra-thallium(I)

The title compound, [Tl₄(C₄H₉O)₄], featuring a (Tl—O)₄ cube, crystallizes with a quarter-mol­ecule (located on a special position of site symmetry ..) and a half-mol­ecule (located on a special position of site symmetry 23.) in the asymmetric unit. The Tl—O bond distances range from 2.463 (12) to 2.506 (12) Å. All O—Tl—O bond angles are smaller than 90° whereas the Tl—O—Tl angles are wider than a recta­ngular angle.

μ(2)-Acetone-diacetone[μ(3)-tris-(trifluoro-meth-yl)methano-lato]bis-[μ(2)-tris-(trifluoro-meth-yl)methano-lato]trilithium

The title compound, [Li(3)(C(4)F(9)O)(3)(C(3)H(6)O)(3)], features an open Li/O cube with an Li ion missing at one corner. Three of the four bridging O atoms of the cube carry a fluorinated tert-butyl residue, whereas the fourth is part of an acetone mol-ecule. Two of the Li atoms are further bonded to a non-bridging acetone mol-ecule. Two of the lithium ion coordination geometries are very distorted LiO(4) tetra-hedra; the third could be described as a very distorted LiO(3) T-shape with two distant F-atom neighbours. The Li⋯Li contact distances for the three-coordinate Li(+) ion [2.608 (14) and 2.631 (12) Å] are much shorter that the contact distance [2.940 (13) Å] between the tetra-hedrally coordinated species.