Synthesis, crystal structure and characterisation of the complex {Ln(DHTA)1.5(H2O)3]·H2O}n (Ln = La, Ce, Nd)

By introducing different metal ions, we present three new coordination polymers {[Ln(DHTA)1.5(H2O)3]·H2O}n (Ln = La 1, Ce 2, Nd 3, H2DHTA = 2,5-dihydroxyterephthalic acid) by using a hydrothermal technique. Structural analysis revealed that 1–3 are isostructural, displaying a one-dimensional structure along the a axis and a two-dimensional network along the b axis, which was stabilised by O–H⋯O intermolecular hydrogen bonding and π–π stacking interactions. The photoluminescent data of the three complexes have been studied in detail. Moreover, C and H elemental analysis, infrared (IR) spectroscopy in the range of 4000–400 cm−1, powder X-ray diffraction and thermogravimetric analysis (TG) of the three complexes have also been described.