{LnIII[μ5-κ2,κ1,κ1,κ1,κ1-1,2-(CO2)2C6H4][isonicotine][H2O]}2CuI·X (Ln = Eu, Sm, Nd; X = ClO4-, Cl-): A New Pillared-Layer Approach to Heterobimetallic 3d−4f 3D-Network Solids

Poly[[diaqua-bis-(μ(3)-isonicotinato-κN:O:O')bis-(μ(2)-isonicotinato-κN:O)gadolinium(III)disiliver(I)] nitrate monohydrate]

In the title compound, {[Ag(2)Gd(C(6)H(4)NO(2))(4)(H(2)O)(2)]NO(3)·H(2)O}(n), the Gd(III) ion is coordinated by eight O atoms from six isonicotinate ligands and two water mol-ecules in a distorted square anti-prismatic geometry. Two Ag(I) ions are each bonded to two N atoms from two isonicotinate ligands in a linear or bow-like fashion [N-Ag-N angles = 178.6 (2) and 147.1 (2)°]. These metal ions are connected by the isonicotin-ate ligands into a layer parallel to (010). O-H⋯O hydrogen bonds donated by the coordinated and uncoordinated water mol-ecules and intra-layer π-π stacking inter-actions between the pyridine rings [centroid-centroid distances = 3.551 (4) and 3.555 (4) Å] are observed. The layers inter-act with each other by inter-layer Ag⋯O(aqua) contacts [2.731 (4) Å] and π-π stacking inter-actions between the pyridine rings [centroid-centroid distances = 3.466 (3) and 3.516 (3) Å], resulting in the formation of a three-dimensional supra-molecular structure.

Poly[diaqua-tris(μ(4)-isophthalato)dilanthanum(III)]

In the title coordination polymer, [La₂(C₈H₄O₄)₃(H₂O)₂]_n, there are two independent La^III atoms which are coordinated differently in slightly distorted penta­gonal-bipyramidal and slightly disorted bicapped trigonal-prismatic environments. The La^III ions are bridged by μ₄-isophthalate ligands, forming two-dimensional layers. In the crystal structure, these layers are connected by inter­molecular O—H⋯O hydrogen bonds into a three-dimensional network.