Journal
JOURNAL OF STRUCTURAL CHEMISTRY
Volume 60, Issue 11, Pages 1833-1841Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S0022476619110180
Keywords
Cu(II) coordination polymer; crystal structure; catecholase activity
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The copper-based polymer is synthesized using a slow evaporation method with an a-diimine chelator (1,10-phenanthroline) as the primary ligand. The synthesized polymer is characterized by various spectroscopic studies (FT-IR, UV-visible, EPR, luminescent), powder XRD and TGA techniques. Single crystal XRD studies reveal the molecular structure as a one-dimensional (1D) coordination polymer (CP) with the composition [Cu(phen)(NO3)(2)](n). The FT-IR spectrum of CP further ascertains the binding modes of the ligand moiety. The copper ion is present in the +2 oxidation state and the geometry around the central metal ion is distorted square pyramidal. Moreover, CP shows a brilliant catecholase-like activity in methanol, which can easily oxidize the substrate 3,5-di-tert-butylcatechol (3,5-DTBC) to its respective quinone. Kinetic measurements suggest that the catechol oxidation rate follows saturation kinetics with respect to the substrate and first order kinetics with respect to the catalyst. CP shows a very good catalytic activity with K-cat = 8.28 h(-1).
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