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, C35H40Gd2Co2N5O32.5, 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, C35H40Dy2Co2N5O32.5, 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.

本研究采用水热预处理结合降温结晶法，合成了三种新型3d-4f异金属配位聚合物，其通式为[Ln₂(H₂O)₄M₂(H₂O)₂(QA)₅]·nH₂O（其中H₂QA为喹啉酸；具体参数如下：样品1：Ln=Gd，M=Ni，n=7；样品2：Ln=Gd，M=Co，n=6.5；样品3：Ln=Dy，M=Co，n=6.5）。该系列化合物均具有同构的三维框架，沿c轴方向存在一维椅形通道，通道内填充未配位水分子。晶体学数据如下：样品1的分子式为C₃₅H₄₁Gd₂Ni₂N₅O₃₃，属正交晶系，空间群Pna2₁，晶胞参数a=28.567(6) Å，b=14.498(3) Å，c=12.250(2) Å，Z=4；样品2的分子式为C₃₅H₄₀Gd₂Co₂N₅O₃₂.₅，属正交晶系，空间群Pna2₁，晶胞参数a=28.843(3) Å，b=14.4325(13) Å，c=12.2275(9) Å，Z=4；样品3的分子式为C₃₅H₄₀Dy₂Co₂N₅O₃₂.₅，属正交晶系，空间群Pna2₁，晶胞参数a=28.8471(14) Å，b=14.4534(10) Å，c=12.2520(7) Å，Z=4。已对该三种化合物的磁学行为进行了研究。