| In this paper,two series of lanthanide-organic coordination polymers（CPs）[Ln2（L1）3（H2O）4][Ln=Nd（1）,Sm（2）,Eu（3）,Gd（4）,Tb（5）,Dy（6）,H2L1=3-methyl-adipic acid]and[Ln4（L2）6（H2O）4][Ln=Nd（7）,Sm（8）,Eu（9）,Gd（10）,Tb（11）,Dy（12）,H2L2=3-tert-butyl-adipic acid]have been synthesized by the solvothermal reactions of lanthanide salts with two flexible substituent adipates.These CPs were characterized by single-crystal X-ray diffraction,powder X-ray diffraction,elemental analysis,IR spectroscopy,and thermal analysis.Structural analyses reveal that CPs 1–6 and 7–12 are isostructural,respectively.In 1–6,the carboxyl groups of 3-methyl-adipates bridge two Ln1ions and two Ln2 ions to generate two types of Ln2 units,respectively.These two types of Ln2 units are linked by 3-methyl-adipates into two types of one-dimensional（1D）chains,respectively.These two types of 1D chains are alternately connected by 3-methyl-adipates to generate a two-dimensional（2D）layer.The neighboring 2D layers are further linked into a three-dimensional supramolecular framework via the hydrogen-bonding interactions.In 7–12,the 3-tert-butyl-adipate anions link four types of Ln IIIII ions to form a 1D strip-shaped chain.The adjacent 1D chains are further connected by the3-tert-butyl-adipate anions to construct a 2D layer.The substituent groups have an important effect on the formation of adipate-based lanthanide CPs.CPs 1–12 possess good thermal stability.CPs 2,3,5,6,9,11,and 12exhibit the characteristic emissions of rare earth ions,respectively.The Gd-containing CP 4 displays a weak ferromagnetic coupling between two GdIIIII ions below 10 K.The Dy-containing CPs 6 and 12 show weak slow magnetic relaxation behaviors under zero direct current field. |
