Crystal structure and Hirshfeld surface analysis of tris-(acetohydrazide-κ 2 N , O )(nitrato-κ O )(nitrato-κ 2 O , O ')terbium(III) nitrate.

In the title lanthanide(III) compound, [Tb(NO 3 ) 2 (C 2 H 6 N 2 O) 3 ]NO 3 , the asym-metric unit contains one Tb 3+ ion, three acetohydrazide (C 2 H 6 N 2 O) ligands, two coordinated nitrate anions, and an isolated nitrate anion. The Tb 3+ ion is in a ninefold coordinated distorted tricapped trigonal-prismatic geometry formed by three oxygen atoms and three nitro-gen atoms from three different acetohydrazide ligands and three oxygen atoms from two nitrate anions. In the crystal, the complex mol-ecules and the non-coordinated nitrate anions are assembled into a three-dimensional supra-molecular architecture through extensive N-H⋯O hydrogen-bonding inter-actions between the amine NH groups of the acetohydrazide ligands and the nitrate oxygen atoms. Hirshfeld surface analysis was performed to aid in the visualization of inter-mol-ecular contacts.