Two Copper(II) coordination polymers constructed from 3, 3-dimethylglutarate and citrate ligands

Two new Cu(II) coordination polymers, formulated as [Cu(mu(4)-dmg)(DMF)](n) (1) and [Cu-4(mu(4)-cit)(2)(H2O)(8)](n) (2) (H(2)dmg = 3,3-dimethylglutaric acid and H(4)cit = citric acid) were successfully synthesized by using H(2)dmg and H(4)cit ligands under solvothermal conditions and characterized by single crystal X-ray diffraction, elemental analyses, IR spectroscopy and powder X-ray diffraction (PXRD). Single crystal X-ray analyses indicate that compound 1 features a two-dimensional (2D) structure with a uninodal 4-connected sq1/Shubnikov tetragonal plane net, whereas 2 displays a three-dimensional frameworks (3D) with a pcu topology. Cu1 ion in 1 is connected by four bridging carboxylates to produce a paddlewheel-shaped {Cu-2(CO2)(4)}SBU, and each Cu(II) ion is also coordinated to a DMF ligand at the axial site of the paddlewheel SBU. In 2, citrate anion acts as a heptadentate ligand and three independent Cu(II) ions are bridged by two carboxyl and one hydroxy groups to form the trinuclear {Cu-3} core. Moreover, thermal and optical band gap properties of the compounds were determined in detailed. (C) 2020 Elsevier B.V. All rights reserved.