biostudies-literatureTavani FMinistero dell'Università e della Ricerca10838-10845https://www.ebi.ac.uk/biostudies/studies/S-EPMC12536401biostudies-literatureUnknown129(41)Although the Belousov-Zhabotinsky (BZ) chemical reaction has been the object of intense research efforts for almost a century, many aspects of the BZ complex oscillatory behavior still remain to be clarified, also due to difficulties in experimentally monitoring the speciation of the main brominated compounds during the reaction cycles. Herein, we describe an integrated approach based on Br K-edge X-ray absorption and ultraviolet-visible (UV-vis) spectroscopies to identify the onset and evolution of concentration-dependent collective bromine oscillations in the classical BZ reaction. Principal component analysis, multivariate curve resolution, and theoretical X-ray spectroscopy simulations were combined to identify the number, nature, and concentration time evolution of the key reaction brThe journal of physical chemistry. BConcentration-Dependent Evolution of the Belousov-Zhabotinsky Reaction as Determined by X-ray Absorption and UV-Vis Spectroscopies.PMC12536401CUP B53C220040700062022SFC459Frateloreto FLanzalunga ODi Stefano SCapocasa GTavani FD'Angelo PDi Berto Mancini MDel Giudice DfalseConcentration-Dependent Evolution of the Belousov-Zhabotinsky Reaction as Determined by X-ray Absorption and UV-Vis Spectroscopies.Although the Belousov-Zhabotinsky (BZ) chemical reaction has been the object of intense research efforts for almost a century, many aspects of the BZ complex oscillatory behavior still remain to be clarified, also due to difficulties in experimentally monitoring the speciation of the main brominated compounds during the reaction cycles. Herein, we describe an integrated approach based on Br K-edge X-ray absorption and ultraviolet-visible (UV-vis) spectroscopies to identify the onset and evolution of concentration-dependent collective bromine oscillations in the classical BZ reaction. Principal component analysis, multivariate curve resolution, and theoretical X-ray spectroscopy simulations were combined to identify the number, nature, and concentration time evolution of the key reaction br2025-01-01T00:00:00Z2025 Oct2026-06-04T13:26:43.664Z2026-05-09T03:11:31.877ZS-EPMC125364014104188810.1021/acs.jpcb.5c04472