Hydroxylation of isophthalic acid in the hydrothermal reaction of CuII-isophthalate system – Syntheses and crystal structures of two coordination polymers

The reaction of isophthalic acid (H2ip) and copper nitrate under hydrothermal condition produced an in situ synthesized ligand 2-hydroxy isophthalic acid (or 2,6-dicarboxyl phenol, H3ipO) derived from H2ip without the presence of N-heterocyclic ligands. The hydroxylation was controlled by the temperature of hydrothermal synthesis. Two coordination polymers, {[Cu5(OH)2(ip)(ipO)2] · (H2O)}n (1) and [Cu3(ipO)2(H2O)2]n (2) were synthesized and characterized by X-ray crystallography, IR spectra and elemental analyses. Complex 1 was assembled with both the original ligand and the in situ synthesized ligand.

Graphical abstractThe reactions of isophthalic acid (H2ip) and copper nitrate under hydrothermal conditions produced an in situ synthesized ligand H3ipO derived from H2ip. Two coordination polymers were formed with Cu2+, ip2− and ipO3−.Figure optionsDownload full-size imageDownload as PowerPoint slide