Crystal structure of an eight-coordinate terbium(III) ion chelated by<i>N</i>,<i>N</i>′-bis(2-hydroxybenzyl)-<i>N</i>,<i>N</i>′-bis(pyridin-2-ylmethyl)ethylenediamine (bbpen<sup>2−</sup>) and nitrate
Acta crystallographica. Section E, Crystallographic communications