Isosbestic point - Wikipedia
In spectroscopy, an isosbestic point is a specific wavelength, wavenumber or frequency at which the total absorbance of a sample does not change during a chemical reaction or a physical change of the sample. The word derives from two Greek words: "iso", meaning "equal", and "sbestos", meaning "extinguishable".
2.1.5: Spectrophotometry - Chemistry LibreTexts
2023年2月13日 · An isosbestic point is the wavelength in which the absorbance of two or more species are the same. The appearance of an isosbestic point in a reaction demonstrates that an intermediate is NOT required to form a product from a reactant.
Isosbestic point - chemeurope.com
In spectroscopy, an isosbestic point is a specific wavelength at which two (or more) chemical species have the same absorptivity. Such a point corresponds to a wavelength on an isosbestic plot at which the absorption spectra of two species cross each other; if both species are in the same concentration, then this represents the molar ...
Importance of isosbestic point in spectroscopy: review
2019年8月25日 · The contributions of different methods to estimate the concentration of a substance by isosbestic point are analyzed. The interrelationship between the characteristics isosbestic point and...
We analyze the sharpness of crossing (“isosbestic”) points which are observed in many quantities described by a function f(x; p), where x is a variable (e.g., the frequency) and p a parameter (e.g., the temperature).
Definition of isosbestic_point - Chemistry Dictionary
What is an Isosbestic Point? This term is usually employed with reference to a set of absorption spectra, plotted on the same chart for a set of solutions in which the sum of the concentrations of two principal absorbing components, A and B, is constant.
1.3: Experimental Details of Absorption spectroscopy
An isosbestic point is the wavelength in which the absorbance of two or more species are the same. The appearance of an isosbestic point in a reaction demonstrates that an intermediate is NOT required to form a product from a reactant.
The isosbestic point is defined [4-7] as the wavelength, wave number or frequency at which the total optical activity of a sample invariant during a chemical reaction or physical change of the...
2.2: Acid-base Equilibria - Chemistry LibreTexts
The presence of isosbestic points thus indicates the presence of only two species in equilibrium. These kinds of isoenzymes contain at least another histidine in the cavity, which represents another acidic group, with a pK a of about 6.5 in its free state.
IUPAC - isosbestic point (I03310)
2014年2月24日 · Contrary to a widely accepted idea, the existence of an isosbestic point does not prove that the reaction is a quantitative conversion of one species into a unique other species or that an equilibrium exists between only two species.
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