A new homobimetallic cobalt(II) complex based on the tetradentate 3,5-bis(2-pyridyl)-1H-1,2,4-triazole ligand: Synthesis, crystal structure, Hirshfeld analysis, spectroscopic characterization, magnetic properties and antimicrobial activities

International audienceA novel homobimetallic cobalt(II) complex, [Co2(bpt)2(H2O)4](NO3)2.2H2O (bpt = 3,5-bis(2pyridyl)-1,2,4-triazolate), has been synthesized and characterized by single crystal X-ray diffraction, Hirshfeld surface analysis, as well as UV-Visible, and FTIR techniques. The crystal structure determination shows that the dinuclear complex crystallizes in triclinic crystal system with P1 ̅ space group. The (N',N 1 ,N 2 ,N'')2 double bridging coordination mode is realised with distorted octahedral N4O2-coordinated cobalt. The structure cohesion is ensured by different intermolecular hydrogen bonds, π-π stacking interactions and by intermolecular lone-pair•••π interactions. The structure consists of dimeric units [Co2(bpt)2] 2+ with a cobalt-cobalt distance of 4.170(2) Å. Magnetic measurements carried out on the homobimetallic complex indicate a relatively weak antiferromagnetic interaction between the two cobalt centres. This complex exhibited antimicrobial activity against several strains of the fungal phytopathogens Verticillium dahliae and Fusarium oxysporum fsp. melonis as well as against the phytopathogenic bacteria Agrobacterium tumefaciens, suggesting its use in crop protection