Solvothermal Syntheses and Characterizations of Two Isomorphous One-Dimensional Chain Complexes Constructed by Orotic Acid

Abstract

Solvothermal reactions of M(OAc)₂ (M = Ni, Co) with orotic acid (2,6-dioxo-1,2,3,6-tetrahydropyrimidine-4-carboxylic acid, H₃L) in H₂O/MeOH (1 : 1) gave rise to two new isomorphous polymeric complexes, [M(HL)(H₂O)₃]_n [M = Ni, (4); Co, (5)], with one-dimensional chain structures. Both complexes crystallize in the orthorhombic space group P2₁2₁2₁, with a 7.7438(7), b 7.7610(7), c 14.6528(12) Å, Z 4 for (4), and a 7.7005(3), b 7.8725(3), c 14.6997(10) Å, Z 4 for (5). X-Ray diffraction analysis shows that the metal ion is coordinated by nitrogen and oxygen atoms of an orotate ligand (HL^2–) and water molecules in a distorted octahedral geometry. The hydrogen-bond interactions between chains leads to the formation of three-dimensional network structures.