Abstract
The Bi4I16 center dot 4(C6H9N2) 2(H2O) compound was synthesized by slow evaporation at room temperature. It exhibits a zero-dimensional (0D) tetrameric structure, comprising [Bi4I16](4-) distorted octahedra, with strong IMIDLINE HORIZONTAL ELLIPSISI interactions among adjacent anionic clusters. We used Hirshfeld surface analysis to discuss the strength of hydrogen bonds and to quantify the inter-contacts (two-dimensional (2D) fingerprint plots). It revealed that the hydrogen bonding interactions HMIDLINE HORIZONTAL ELLIPSISI (56.3%), pi-pi stacking (11.7%), and IMIDLINE HORIZONTAL ELLIPSISI interactions (5.9%) play the major role in the stability of the crystal structure. The crystal morphology was simulated using Bravais-Friedel, Donnay-Harker (BFDH) and growth morphology (GM) methods. The experimental habit of the title compound was adequately reproduced by the two models. The calculated results show that the crystal morphology of the title compound in a vacuum is dominated by five facets: (020), (011), (110), (10-1), and (11-1). The (020) facet is the largest among all the facets calculated. Projection of the facet showed that there are a few polar groups on the (020) facet. In the 50-400 and 400-4000 cm(-1) frequency regions, we measured the Raman and infrared spectra, respectively, of the title compound, and we assigned the observed vibration modes.