Syntheses, characterization and Hirshfeld surface analyses of three new Co(II)-based coordination compounds with distinctive structures

Three novel Co(II)-based coordination compounds 1–3 have been synthesized and characterized by single-crystal X-ray diffraction, infrared spectroscopy, powder X-ray diffraction, thermogravimetric analyses, element analysis and UV–vis absorption spectroscopy. Interestingly, compounds 1 and 2 exhibit 0-periodic structures, while compound 3 is a 1-periodic network structure. The weak interactions (hydrogen bonding and CH⋯π interactions) can effectively stabilize the entire structures of these compounds. The topology structures of these three supramolecular frameworks are also analyzed. The results confirm that the weak interactions play an important role in the supramolecular framework. The weak interactions are visualized by Hirshfeld surface analyses, and the energy frameworks of compounds 1 and 2 are constructed.