Synthesis, crystal structure, Hirshfeld surface analysis, and energy framework of bis-{3-(4-bromo-phen-yl)-5-[6-(1H-pyrazol-1-yl)pyridin-2-yl]-4H-1,2,4-triazol-4-ido}nickel(II) methanol disolvate and comparison with its chloro-substituted analogue.

The unit cell of the title compound, [Ni(C16H10BrN6)2]·2CH3OH, contains a neutral complex and two methanol mol-ecules. The NiII ion adopts a pseudo-octa-hedral geometry, coordinated by two tridentate ligands via pyrazole, pyridine, and triazole N atoms. The average Ni-N bond length is 2.097 (4) Å. In the crystal, mol-ecules form supra-molecular chains through weak C-H⋯π inter-actions and further assemble into diperiodic layers via C-H⋯N/C inter-actions. Hirshfeld surface analysis shows H⋯H (32.1%), H⋯C/C⋯H (27.3%), H⋯N/N⋯H (14.9%), and H⋯Br/Br⋯H (14.6%) contacts. Inter-action energies were evaluated using HF/3-21 G energy frameworks analysis. Structural parameters were compared to those of the chloro-containing analogue, and the effect of substituent variation was discussed.