Assembly of co coordination polymers tuned by the N-donor ligands with different spacer: Syntheses, structures and photocatalytic properties.

• Two different structural frameworks have been designed and synthesized. • Photocatalytic studies show both of them have efficient degradation activity of organic dye methyl violet. • The possible mechanism of the photocatalytic property has been suggested. Two new CoII-based coordination polymers tuned by the flexible "V"-shaped 3,3ˊ-(1,2-phenylenebis(methyleneoxy)) dibenzoic acid (H 2 L) and different N -donor spacers, namely, [Co(L)(bib)] n (1) and [Co 2 (L) 2 (phen) 2 (H 2 O) 2 ·H 2 O] n (2) (bib = 1,4-bis(1-imidazoly)benzene and phen = 1,10-phenanthroline) have been prepared. In 1, the CoII centers are linked by L to form a Co–L chain, which is further extended into a 2D wave-like layer by bib linkers. In 2 , the L linker connected the adjacent Co(II) centers into 1D chain, which is joined into a 3D supramolecular structure through H-bonded and π–π stacking interactions. The diverse networks of 1–2 demonstrate that the steric hindrance effect may show significant effect on the final structures. In addition, the title complexes exhibit photocatalytic activity for dye methyl violet (MV) degradation under UV light. [ABSTRACT FROM AUTHOR]