Water-soluble heterometallic copper( II)-sodium complex comprising arylhydrazone of barbituric acid as a ligand

摘要

A new aqua-soluble Cu~(II)-Na coordination polymer, {{Cu(H2O)Na(H2O)(η9-L)]·2H2O}_n, was easily generated by self-assembly from copper(II) nitrate, sodium hydroxide and 2-hydroxy-5-nitro-3-(2-(2,4,6-tri-oxotetrahydropyrimidin-5(2H)-ylidene)hydrazinyl)benzene sulfonic acid (H3L) a new hydrosoluble arylhydrazone of barbituric acid. The complex was characterized by IR spectroscopy, elemental and single-crystal X-ray diffraction analyses, which disclosed 1D metal-organic chains driven by the intricate nona-chelation of the fully deprotonated L~(3-) derivative to five metal cations (three Na~I and two Cu~(II)). These chains have intercalated crystallization water molecules enabling the expansion of the structure to 3D by means of extensive hydrogen bond interactions.