Short communicationCrystal structure, vibrational spectroscopic characterization, thermal behavior and antifungal activity of a novel coordination polymer of indole‑3‑carboxylic acid with cobalt(II) and a comparison with the isostructural Zn(II) complex

Add time:09/26/2019    Source:sciencedirect.com

A new cobalt(II) coordination polymer of indole‑3‑carboxylic acid (I3CAH2), [Co(I3CAH)2(H2O)]n has been synthesized and characterized using single-crystal X-ray diffraction, infrared spectroscopy and thermal (TGA/DTG analysis). The crystal structure is monoclinic, space group Cc, with a = 33.406(7), b = 5.9287(12), c = 8.2790(17) Å, β = 91.52(3)°, V = 1639.1(6) Å3 and Z = 4. Each cobalt cation is five-coordinated by the bidentate chelating indole‑3‑carboxylato ligand, one bridging oxygen atom from the other ligand in the same independent unit, one water molecule, and one bridging oxygen atom of the indole‑3‑carboxylato group from an adjacent [Co(I3CAH)2(H2O)] unit. Infrared spectra and TGA/DTG analysis of [Co(I3CAH)2(H2O)]n in the solid state support the results from X-ray analysis. Comparison of the X-ray data and the vibrational spectra of the title compound with those of the previously reported zinc(II) coordination polymer [Zn(I3CAH)2(H2O)]n has shown that these compounds are isostructural. The antifungal activity of [Co(I3CAH)2(H2O)]n against Aspergillus niger and Candida albicans has been investigated. The new Co(II) compound is remarkably effective against Candida albicans.

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