| Abstract: | Reactions of phenanthroline (phen) and Er(NO3)3 · 5 H2O or Lu(NO3)3 · H2O in CH3OH/H2O yield Ln2(phen)4(H2O)4(OH)2](NO3)4(phen)2 with Ln = Er ( 1 ), Lu ( 2 ). Both isostructural complex compounds crystallize in the triclinic space group P 1 (no. 2) with the cell dimensions: a = 11.257(2) Å, b = 11.467(2) Å, c = 14.069(2) Å, α = 93.93(2)°, β = 98.18(1)°, γ = 108.14(1)°, V = 1696.0(6) Å3, Z = 1 for ( 1 ) and a = 11.251(1) Å, b = 11.476(1) Å, c = 14.019(1) Å, α = 93.83(1)°, β = 98.27(1)°, γ = 108.27(1)°, V = 1689.0(3) Å3, Z = 1 for ( 2 ). The crystal structures consist of the hydroxo bridged dinuclear Ln2(phen)4(H2O)4(OH)2]4+ complex cations, hydrogen bonded NO3– anions and π‐π stacking (phen)2 dimers. The rare earth metal atoms are coordinated by four N atoms of two phen ligands and four O atoms of two H2O molecules and two μ‐OH groups to complete tetragonal antiprisms. Via two common μ‐OH groups, two neighboring tetragonal antiprisms are condensed to a centrosymmetric dinuclear Ln2(phen)4(H2O)4(OH)2]4+ complex cation. Based on π‐π stacking interactions and hydrogen bonding, the complex cations and (phen)2 dimers form 2 D layers parallel to (1 0 1), between which the hydrogen bonded NO3– anions are sandwiched. The structures can be simplified into a distorted CsCl structure when {Ln2(phen)4(H2O)4(OH)2](NO3)4} and (phen)2 are viewed as building units. |
