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.

Key words: HIGHPOLYMER, NETWORK POLYMER, ULTRAVIOLET SPECTROPHOTOMETRY, INFRARED SPECTROPHOTOMETRY, CRYSTAL STRUCTURE, NEODYMIUM NITRATE, BENZENECARBOXYLIC ACID P, BENZAMINE P, NEODYMIUM COMPLEX