Crystal structure and DFT study of bis{(<i>S</i>)-2-[(2-hydroxybenzyl)amino]-4-methylpentanoato-κ<sup>2</sup><i>N</i>,<i>O</i>}(1,10-phenanthroline-κ<sup>2</sup><i>N</i>,<i>N</i>′)nickel(II)
Acta crystallographica. Section E, Crystallographic communications