Switching from Bonding to Nonbonding: Temperature-Dependent Metal Coordination in a Zinc(II) Sulfadiazine Complex

The metal coordination in the mononuclear complex diamminebis­(sulfadiazine)­zinc shows a unique temperature dependence: High-resolution diffraction data prove that the coordination is almost tetrahedral at 100 K, whereas a fifth longer interaction becomes relevant at 200 K. The change in the geometry is fully reversible and is also reflected in the charge density of the compound.