metal-organic compounds
The title compound, [Er(C5H7O2)3(C12H8N2)], is a mixed-ligand metal–organic precursor for chemical vapour deposition, with the Er atom being eight-coordinate. The coordination polyhedron, described as a distorted square antiprism, is formed by three bidentate (chelating) acetylacetonate residues and a phenanthroline ligand in the apical positions. Molecular assembly via C—HO hydrogen bonds generates a sheet structure in the ac plane. Weak co-operative C—Hπ interactions form molecular dimers and contribute to the stability of the intersheet packing. The supramolecular assembly contains voids which form hydrophobic porous channels, surrounded by a cluster of dimers.
organic compounds
In the structure of the title salt [systematic name: 3-(10,11-dihydro-5H-dibenzo[a,d][7]annulen-5-ylidene)-N,N-dimethylpropan-1-aminium 2,4,6-trinitrophenolate] of a tricyclic antidepressant, C20H24N+·C6H2N3O7−, the dimethylaminopropyl subunit possesses a classical static conformational disorder. The central cycloheptadiene ring adopts a bent conformation that is intermediate between boat and chair forms, leading to a butterfly shape for the hetero-tricyclic moiety. In a complementary fashion, donors from amitriptyline and acceptors from picrate form intermolecular C—HO hydrogen bonds and N—HO salt bridges. These hydrogen bonds cluster amitriptyline and picrate ions into a closed R44(36) hetero-tetramer, whereas intermolecular C—Hπ interactions between amitriptyline ions cluster them into homo-dimers. Significant π–π stacking interactions are also observed between aromatic rings of amitriptyline and picrate, and these, combined with the C—Hπ interactions, associate molecules into linear arrays along the [11] direction.