Synthesis, Recrystallization and Structural Characterization of a Novel Sodium Structure Na2(C13H8N3O5)2(H2O)6

Summary: A novel sodium Alizarin Yellow R structure Na2(C13H8N3O5)2(H2O)6 has been observed by accident when 2-hydroxy-5-((4-nitrophenyl)azo) benzoic acid mono sodium salt (mono sodium salt of Alizarin Yellow R) was used as a ligand. The tetramer was characterized by single-crystal Xray diffraction, FT-IR spectroscopy and UV/Vis spectroscopy. The tetramer crystallizes in triclinic space group P 1 with a = 7.2202(9) A, b = 13.0624(15) A, c = 17.0605(19) A, α = 77.137(2)°, β = 80.922(2)°, γ = 83.354(2)°. V = 1543.56(3) A 3 , Z = 2. There are two crystallographically independent sodium centers in the crystal structure. The local coordination geometry of the two sodium centers [NaO6] can be best described as slightly distorted octahedrons. The aromantic π-π stacking plays an important role in the formation of 3D network.