Synthesis and Structure of a New Gadolinium Porous Complex Assembled from 2,3-Pyrazinedicarboxylic Acid and Ammonia

A new gadolinium porous complex,(NH4)2[Gd2(pzdc)4(H2O)2],was synthesized through hydrothermal reaction of 2,3-pyrazinedicarboxylic acid and Gd(NO3)3·6 H2O with the pH value adjusted by ammonia.It was characterized by elemental analysis,FT-IR,TGA and further by single-crystal X-ray crystallography.It crystallizes in monoclinic,space group P21/c with a=14.249(7),b=15.889(8),c=12.846(7)A,β=95.724(10)°,V=2894(3)A^3,Z=4,Dc=2.385 g/cm^3,μ(Mo Ka)=4.65 mm^–1 and F(000)=1976.1976 reflections were measured and 6446 independent reflections(Rint=0.0985)were used in further refinement.The complex exhibits a 3D framework constructed from the[Gd2(pzdc)4(H2O)2]2-building blocks.It is scarce that the NH4+cations are located in the channels and balance the charge of anion framework.Furthermore,the ion exchange property of this complex has also been studied.The NH4+cations can be replaced by Na+cations,which is an uncommon phenomenon for gadolinium-containing porous complex.

A new gadolinium porous complex,（NH4）2[Gd2（pzdc）4（H2O）2], was synthesized through hydrothermal reaction of 2,3-pyrazinedicarboxylic acid and Gd（NO3）3·6 H2O with the pH value adjusted by ammonia. It was characterized by elemental analysis, FT-IR, TGA and further by single-crystal X-ray crystallography. It crystallizes in monoclinic, space group P21/c with a = 14.249（7）, b = 15.889（8）, c = 12.846（7） ?, β = 95.724（10）°, V = 2894（3） ?3, Z = 4, Dc = 2.385 g/cm3, μ（Mo Ka） = 4.65 mm–1 and F（000） = 1976. 1976 reflections were measured and 6446 independent reflections（Rint = 0.0985） were used in further refinement. The complex exhibits a 3D framework constructed from the [Gd2（pzdc）4（H2O）2]2-building blocks. It is scarce that the NH4+ cations are located in the channels and balance the charge of anion framework. Furthermore, the ion exchange property of this complex has also been studied. The NH4+ cations can be replaced by Na+ cations, which is an uncommon phenomenon for gadolinium-containing porous complex.