Synthesis and Crystal Structure of [La(phen)2(H2O)2(NO3)2]NO3 · 2(phen)(H2O) with phen = 1,10-phenanthroline

Abstract

The title compound [La(phen)2(H2O)2(NO3)2](NO3) · 2(phen)(H2O) with phen = 1,10-phenanthroline was prepared by the stoichiometric reaction of La(NO3)3 · 6 H2O and 1,10-phenanthroline monohydrate in a CH3OH–H2O solution. The crystal structure (triclinic, P 1 (no. 2), a = 11.052(2), b = 13.420(2), c = 16.300(2) A, α = 78.12(1)°, β = 88.77(1)°, γ = 83.03(1)°, Z = 2, R = 0.0488, wR2 = 0.1028) consists of [La(phen)2(H2O)2(NO3)2]2+ complex cations, NO3– anions, phen and H2O molecules. The La atom is 10-fold coordinated by four N atoms of two bidentate chelating phen ligands and six O atoms of two H2O molecules and two bidentate chelating NO32– ligands with d(La–O) = 2.522–2.640 A and d(La–N) = 2.689–2.738 A. The intermolecular π-π stacking interactions play an essential role in the formation of two different 2 D layers parallel to (001), which are formed by complex cations and uncoordinating phen molecules, respectively. The uncoordinated NO3– anions and H2O molecules are sandwiched between the cationic and phen layers.