AI Article Synopsis
- The study focused on analyzing the distribution and structures of chromium aqua and chloro complexes using UV-vis and X-ray absorption spectra.
- Various chromium complexes were identified, including distinct geometric forms such as planar square and distorted tetrahedral configurations, with thermodynamic parameters for the complexation reactions being quantitatively determined.
- The research indicated that specific chromium species exist in acidic conditions (pH 1) but change during hydration, highlighting the need for further kinetic analysis to better understand these speciation processes.
Article Abstract
The distribution of metal aqua and chloro complexes is fundamental information for analysis of a chemical reaction involving these complexes. The present study investigated the speciation and structures of chromium aqua and chloro complexes using the thermodynamic model fitting analysis of UV-vis/X-ray absorption spectra. The existence of a negatively charged species was examined by adsorbability of chromium species on a strong base anion exchanger. In the results, a planar square [Cr(HO)], a planar square or distorted tetrahedral [CrCl(HO)], a trigonal bipyramidal [CrCl(HO)], and a distorted octahedral [CrCl(HO)] were confirmed and the thermodynamic parameters of complexation reactions were quantitatively determined. Investigation of the evolution of speciation of chromium aqua and chloro complexes in a pH 1 solution suggested the existence of [CrCl(HO) ] ( = 2 or 3) during the hydration process, which diminished in the equilibrium state. The kinetic analysis deserves further investigation to understand the speciation process quantitatively.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9664556 | PMC |
| http://dx.doi.org/10.1039/d2ra06279h | DOI Listing |
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