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) (angstrom), b = 14.498(3) (angstrom), c = 12.250(2) (angstrom), and Z = 4; for 2, C35H40Gd2Co2N5O32.5, orthorhombic, space group Pna21, with a = 28.843(3) (angstrom), b = 14.4325(13) (angstrom), c = 12.2275(9) (angstrom), and Z = 4; for 3, C35H40Dy2Co2N5O32.5, orthorhombic, space group Pna21, with a = 28.8471(14) (angstrom), b = 14.4534(10) (angstrom), c = 12.2520(7) (angstrom), and Z = 4. The magnetic behaviors for the three compounds have been investigated.