具有三维网络的新型配位聚合物[Nd(C7H6NO2)3.H2O]n的合成、结构和性质

以Nd(NO3).6H2O和NH2C6H4COOH为原料，经[Nd(C7H6NO2)3.H2O]的自组装，得到了具有三维网络结构的配位聚合物[Nd(C7H6NO2)3.H2O]n。该聚合物晶体属单斜晶系，空间群P2(1)/n,a=0.98069(5)nm,b=2.2736(2)nm,c=0.98254(8)nm,β=100.053(5)°，V=2.1571(3)nm^3,Z=4。最后的一致性因子R=0.038。磁性研究表明，该化合物在低温下表现出反铁磁性质。测定了化合物的UV-vis-NIR和IR光谱，进行了分析和指认。

Synthesis, structure and properties of a novel coordination polymer having three-dimensional networks [Nd(C7H6NO2)3.H2O]n

Reaction of Nd(NO3).6H2O with NH2C6H4COOH by a hydrothermal method furnishes a novel coordination polymer [Nd(C7H6NO2)3.H2O]n. The polymer is monoclinic, space group P2(1)/n, a=0.98069(5) nm, b=2.2736 (2) nm, c=0.98254(8) nm, β=100.053(5)°，V=2.1571(3) nm^3, Z=4. Final R=0.038. The polymer is prepared by self-assembly of [Nd(C7H6NO2)3. H2O] unit. Each unit contains one Nd^3^+ ion and three independent p- aminobenzoate ligands, which coordinate in different fashions. Each Nd^3^+ is 8-coordinated, forming an irregular polyhedron. In the polymer, firstly, Nd^3^+ ions are bridged by the carboxylic groups of two p-aminobenzoate ligands forming one-dimensional chain. Then chains are linked by the ligands forming two-dimensional network. The two-dimensional networks are bonded by various hydrogen bonds assembling three-dimensional network structure. IR and UV-vis-NIR spectra and magnetic susceptibility of the polymer have been determined and discussed.