2-D coordination polymers of copper and cobalt with 3,4-pyridinedicarboxylic acid: synthesis, characterization, and crystal structures

Abstract

Two new complexes involving 3,4-pyridinedicarboxylic acid (3,4-H 2 pdc), copper(II) and cobalt(II) complexes, {[Cu(3,4-Hpdc) 2 (H 2 O) 2 ]·2dmso} n (1) and {[Co(3,4-Hpdc) 2 (H 2 O) 2 ]·2H 2 O·2dmso} n (2) (dmso = dimethylsulfoxide), have been synthesized by the diffusion method and characterized by elemental analysis, IR spectroscopy, thermal analysis, powder and single-crystal X-ray diffraction analysis, and electron paramagnetic resonance (EPR). In both compounds, the metal coordination sphere is composed of a trans-MO 4 N 2 core and adopts a distorted octahedral geometry in accordance with X-ray diffraction and EPR results. 3,4-Hpdc − ligands bridge the metal centers giving two-dimensional (2-D) coordination polymers with four-connected uninodal nets of (4,4) topology.

A Co-Crystallised Cobalt(II) Cluster of Pyridinedicarboxylic Acid (PDC) as a Luminescent Material for Selective Sensing of Methanol

“…Additionally, a sharp absorption band due to aromatic ν(C-N) stretching vibration was observed at 1187 cm -1 , this band was seen at higher frequency in the spectrum of the free ligand. This indicates pyridine N-group chelation to the Co(II) center [27]. The weak peaks at 532 cm -1 and 428 cm -1 are assigned to ν(Co-N) and ν(Co-O) respectively.…”

Calcium coordination compounds of anionic forms of hydrogen dipicolinate and quinolinate: synthesis, characterization, crystal structures and DFT studies

“…The calculated value ∆ν(COO -) is 171 cm -1 , confirming a multidentate coordination mode of the 2,6-H2pdc ligand. However, the ν(C-N) found in the ligand at 1130 cm -1 is shifted to 1146 cm -1 in the spectrum of 1 due to coordination to the metal [33]. The broad band at 2571 cm -1 is assigned to O-H of carboxylic acid and is as a result of partial deprotonation of the ligand.…”

Calcium coordination compounds of dipicolinic and quinolinic acids: synthesis, characterization, crystal structures and DFT studies

“…The calculated value ∆ν(COO − ) is 171 cm −1 , con rming a multidentate coordination mode of the 2,6-H 2 pdc ligand. However, the ν(C-N) found in the ligand at 1130 cm −1 is shifted to 1146 cm −1 in the spectrum of 1 due to coordination to the metal [32]. The broad band at 2571 cm −1 is assigned to O-H of carboxylic acid and is as a result of partial deprotonation of the ligand.…”