The reaction of NiCl2•6H2O and HL 1 in a basic MeOH solution heated at 65 °C for 40 minutes affords compound 1 (Fig. ) upon diffusion of acetone into the cooled mother liquor (see the SI for full experimental details). Crystals of 1 are in a tetragonal crystal system and structure solution was performed in the space group P42/n (see the SI for full crystallographic details, Table , Fig. ). The asymmetric unit contains half the formula unit.