Recently, azo derivatives have attracted attention because the phenylazo-naphtholate group can provide N,O-bidentate chelation to stabilize transition or main group metal complexes. azo derivatives and their metal complexes are very important pigments for synthetic leather and vinyl polymers. On the other hand, Azo-metal chelates are known to be involved in a number of biological reactions, such as inhibi- tion of DNA, RNA, and protein synthesis, nitrogen fixation, and carcinogenesis. Furthermore, high-density optical data storage has been a subject of extensive research in the past decade.

The present work aimed chiefly to throw more light on the Structural characterization of the title mononuclear Co(II). The coordination behaviour of this azo compound towards Co(II) ion is reported using different analytical tools of single crystal X-ray diffraction analysis. Furthermore, the role of weak intermolecular interactions in the crystal packing has been analysed and quantified using Hirshfeld surface analysis.