| Summary: | The asymmetric unit of [La(C20H21N3O3PS)3(C12H8N2)] is created by one LaIII ion, three deprotonated N-{bis[methyl(phenyl)amino]phosphoryl}benzenesulfonamidate (L−) ligands and one 1,10-phenanthroline (Phen) molecule. Each LaIII ion is eight-coordinated (6O+2N) by three phosphoryl O atoms, three sulfonyl O atoms of three L− ligands and two N atoms of the chelating Phen ligand, leading to the formation of six- and five-membered metallacycles, respectively. The lanthanum coordination polyhedron has a bicapped trigonal–prismatic geometry. `Sandwich-like' intramolecular π–π stacking interactions are observed between the 1,10-phenanthroline ligand and two benzene rings of two different L− ligands. The phenyl rings of L− that are not involved in the stacking interactions show minor positional disorder. Molecules form layers parallel to the (010) plane due to weak C—H...O intermolecular hydrogen bonds. Unidentified highly disordered solvate molecules that occupy ca 400 Å3 large voids have been omitted from the refinement model.
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