Three yttrium crotonate complexes with diimines.

The synthesis and crystal structures of three new yttrium crotonate (crot) compounds, associated with three different nitrogenous bases, namely 1,10-phenanthroline (phen), 4-methyl-1,10-phenanthroline (mphen) and 2,2'-bipyridylamine (bpa), are presented. All three compounds organize as centrosymmetric dimers, to give tetra-μ-crotonato-bis[crotonato(1,10)-phenanthroline)yttrium(III)] dihydrate, [Y 2 (C 4 H 5 O 2 ) 6 (C 12 H 8 N 2 ) 2 ].2H 2 O or [Y(crot) 3 (phen)] 2 .2H 2 O, (I), tetra-μ-crotonato-bis[crotonato(4-methyl-1,10-phenanthroline)yttrium(III)] dihydrate, [Y 2 (C 4 H 5 O 2 ) 6 (C 13 H 10 N 2 ) 2 ].2H 2 O or [Y(crot) 3 (mphen)] 2 .2H 2 O, (II), and tetra-μ-crotonato-bis[diaqua(crotonato)yttrium(III)] 2,2'-bipyridylamine tetrasolvate, [Y 2 (C 4 H 5 O 2 ) 6 (H 2 O) 4 ].4C 10 H 9 N 3 or [Y(crot) 3 (aq) 2 ] 2 .4(bpa), (III). Complexes (I) and (II) are isomorphous, with the bases acting as chelating ligands. In complex (III), the coordination sphere is built up of carboxylate and aqua ligands, with the non-coordinated diimine acting as included solvent.