Sonochemical-Assisted Synthesis of a Novel Nano-Cobalt(II) Coordination Complex Toward Morphology Design, and Control: Crystallography and Hirshfeld Surface Analysis Studies

Nano-structures of Cobalt Metal-Organic Complex (Co-MOC), [Co(NCS)2(L)(H2O)2.3(L)] {1} (L=2,5-dimethyl pyrazine), have been synthesized under different experimental conditions. Micrometric crystals (bulk) or nano-sized materials have been obtained depending on using the branch tube method or sonochemical irradiation. All materials have been characterized by Scanning Electron Microscopy (SEM), Powder X-Ray Diffraction (PXRD), FT-IR spectroscopy, and elemental analyses. Single crystal X-ray analyses on 1 display that Co2+ ions are 6-coordinated and 0D coordination complex and two organic ligands (L) are not coordinated to Co(II) in the crystal lattice. Moreover, the impacts of the following parameters were investigated: ultrasonic power, reaction temperature, and reactant concentrations on structural and morphological features of the obtained materials. In the following step, the size of the nanomaterials was investigated based on SEM images. Finally, the intermolecular interaction of molecular crystals of 1 was also studied by Hirshfeld surface analysis.