Three-Dimensional 3d−4f Heterometallic Coordination Polymers:  Synthesis, Structures, and Magnetic Properties

Three new 3d−4f heterometallic coordination polymers, [Ln₂(H₂O)₄M₂(H₂O)₂(QA)₅]·nH₂O (H₂QA = quinolinic acid; Ln = Gd, M = Ni, n = 7 (1); Ln = Gd, M = Co, n = 6.5 (2); Ln = Dy, M = Co, n = 6.5 (3)), have been synthesized through hydrothermal pretreatment and cooling-down crystallization. These compounds possess the isostructural 3D frameworks with 1D chairlike channels along the c axis, which are occupied by noncoordinating water molecules. Crystal data:  for 1, C₃₅H₄₁Gd₂Ni₂N₅O₃₃, orthorhombic, space group Pna2₁, with a = 28.567(6) Å, b = 14.498(3) Å, c = 12.250(2) Å, and Z = 4; for 2, C₃₅H₄₀Gd₂Co₂N₅O_32.5, orthorhombic, space group Pna2₁, with a = 28.843(3) Å, b = 14.4325(13) Å, c = 12.2275(9) Å, and Z = 4; for 3, C₃₅H₄₀Dy₂Co₂N₅O_32.5, orthorhombic, space group Pna2₁, with a = 28.8471(14) Å, b = 14.4534(10) Å, c = 12.2520(7) Å, and Z = 4. The magnetic behaviors for the three compounds have been investigated.