Three-dimensional 3d-4f heterometallic coordination polymers: Synthesis, structures, and magnetic properties

Three new 3d-4f heterometallic coordination polymers, [Ln(2)(H2O)(4)M-2(H2O)(2)(QA)(5)]center dot nH(2)O (H(2)QA = 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 Pna2(1), 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 Pna2(1), 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 Pna2(1), 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.