Yttrium complexes with N-donor ligands

Compounds [HBipy][Y(NCS)4(Bipy)2] · H2O (I), [HPhen][Y(NCS)4(Phen)2] (II), and [Y(Nic)3(H2O)2]2 (III), where Bipy is 2,2′-bipyridine and Phen is 1,10-phenanthroline, are synthesized and structurally characterized by X-ray diffraction analyses (CIF files CCDC 984621, 984622, and 934971, respectively). In the anionic complexes, the coordination polyhedron of sodium is formed by eight nitrogen atoms, four of which are provided by the acido ligands and four others are given by two molecules of the N-heterocycle. In compounds I and II, the protonated and coordinated diimines together participate in stacking interactions.