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Molecular packing analyses were carried out on 15 crystal data sets of chloro-substituted Schiff bases, including that of the title compound, C15H15ClN2. C—H…π and π-π interactions play a major role in the molecular self-assembly in the crystal. The former interactions favor molecules assembling into a screw, with a non-centrosymmetric crystal structure. When the molecular dipole is small, π-π interactions favor a parallel, but not usually antiparallel, mode of packing. Weak C—H…X hydrogen bonds (X = Cl or Br) and X…X interactions seem to be a secondary driving force in packing. The title molecule takes the trans form and the two benzene rings are twisted around the central linkage in opposite directions. In the crystal structure, molecules interact through C—H…π and π-π interactions, forming a ‘dimer’ and further forming double chains along [001]. The double chains are extended along [101] through C—H…Cl hydrogen bonds, forming double layers in (010). In the third direction, there are only ordinary, weaker, van der Waals interactions, which explains the crystal habit (i.e. thin plate). [ABSTRACT FROM AUTHOR]

In the molecule of the title compound, C16H13BrO, the two benzene rings are rotated in opposite directions with respect to the central C—C=C—C part of the molecule. The phenone O atom deviates from the least-squares plane of the molecule by 0.300 (3) Å. In the crystal structure, molecules are paired through C—H…π interactions. The molecular pairs along [001] are hydrogen bonded through three translation-related co-operative hydrogen bonds in the ‘bay area’, forming molecular chains, which are further hydrogen bonded through C—H…Br weak interactions, forming (010) molecular layers. In the third direction, there are only weak van der Waals interactions. The co-operative hydrogen bonds in the ‘bay area’ are discussed briefly. [ABSTRACT FROM AUTHOR]

The title compound, (C6H14N2)[Cr3O10], consists of a diazabicyclo[2.2.2]octane-1,4-diium cation and a discrete trichromate anion linked by an N-H···O hydrogen bond. Three CrO4 tetrahedra are joined via shared O atoms to form the trichromate anion. Supramolecular rings, which can be described by the graph-set motif R44(26), are built via NH···O hydrogen bonds, and C-H···O interactions play lesser roles in forming the structure. [ABSTRACT FROM AUTHOR]

In the molecule of the title compound, C16H13BrO, the two benzene rings are rotated in opposite directions with respect to the central C—C=C—C part of the molecule. The phenone O atom deviates from the least-squares plane of the molecule by 0.300 (3) Å. In the crystal structure, molecules are paired through C—H…π interactions. The molecular pairs along [001] are hydrogen bonded through three translation-related co-operative hydrogen bonds in the ‘bay area’, forming molecular chains, which are further hydrogen bonded through C—H…Br weak interactions, forming (010) molecular layers. In the third direction, there are only weak van der Waals interactions. The co-operative hydrogen bonds in the ‘bay area’ are discussed briefly. [ABSTRACT FROM AUTHOR]