Two coordination polymers constructed by 5-[(4-carboxyphenoxy)methyl]benzene-1,3-dicarboxylic acid and 2,2'-bipyridine: syntheses, structures and luminescence properties.

Coordination polymers (CPs) have attracted increasing interest in recent years. In this work, two new CPs, namely poly[[aquabis(2,2'-bipyridine-κ2 N,N'){μ3 -5-[(4-carboxylatophenoxy)methyl]benzene-1,3-dicarboxylato-κ4 O1 ,O1' :O3 :O5 }(μ-formato-κ3 O:O,O')dicadmium(II)] monohydrate], {[Cd2 (C16 H9 O7 )(HCO2 )(C10 H8 N2 )2 (H2 O)]·H2 O}n (1), and poly[[(2,2'-bipyridine-κ2 N,N'){μ3 -5-[(4-carboxylphenoxy)methyl]benzene-1,3-dicarboxylato-κ4 O1 ,O1' :O3 :O5 }manganese(II)] sesquihydrate], {[Mn(C16 H10 O7 )(C10 H8 N2 )]·1.5H2 O}n (2), have been prepared using the tricarboxylic acid 5-[(4-carboxyphenoxy)methyl]benzene-1,3-dicarboxylic acid and 2,2'-bipyridine under hydrothermal conditions. CP 1 displays a two-dimensional layer structure which is further extended into a three-dimensional (3D) supramolecular structure via intermolecular π-π interactions, while CP 2 shows a different 3D supramolecular structure extended from one-dimensional ladder chains by intermolecular π-π interactions. In addition, the solid-state luminescence spectra of 1 and 2 were studied at room temperature.