One-pot hydrothermal synthesis of a mononuclear cobalt(II) complex and an organic-inorganic supramolecular adduct: Structures, properties and hirshfeld surface analyses

Through the hydrothermal reaction of cobalt(II) perchlorate hexahydrate with 5-bromo-6-methyl-pyridine-2-carboxylic acid (5-Br-6-Me-Hpyc) and 1,4-bis(4-pyridyl)benzene (1,4-bpb) coligands, a cobalt(II) complex [Co(5-Br-6-Me-pyc)(2)(H2O)].2H(2)O (1) and an organic-inorganic adduct [H-2(1,4-bpb)].2ClO(4) (2) have been co-synthesized in the same medium. Structural analyses indicated that the cobalt(II) ion in 1 is penta-coordinated by one water and two bidentate chelate 5-Br-6-Me-pyc anionic ligands to obtain an asymmetric mononuclear species. While in 2, the two pyridyl groups of 1,4-bpb acquire two protons forming a bivalent cation pyridinium, which combine two perchlorate anions via N-H...O hydrogen bonds to fabricate an interesting anion-cation supramolecular adduct 2. The magnetism for 1, fluorescence for 2 as well as the hirshfeld surface structures for them have been carefully described and discussed.

Automated summary

Two cobalt(II) complexes have been co-synthesized through a hydrothermal reaction. The structures and properties of the complexes have been carefully analyzed and discussed.