Results 161 to 170 of about 10,545 (194)

Do our students really understand the Hammett equation?

Journal of Chemical Education, 1993
In this author's experience, many students can proceed through text questions dealing with the Hammett equation without having a full understanding of the Hammett analysis. He offers a question that enables students to gain a better appreciation of this concept.
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ChemInform Abstract: The Prehistory of the Hammett Equation

ChemInform, 2000
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
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Quantitative structure–retention relationships of phenolic compounds without Hammett’s equations

Journal of Chromatography A, 2003
Retention times of phenolic compounds in a given pH eluent in reversed-phase liquid chromatography were predicted from dissociation constants derived from atomic partial charges and log P-values calculated by a computational chemical method. The precision of the calculation of atomic partial charges by AMI and PM3 methods of MOPAC was evaluated.
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Class Projects in Physical Organic Chemistry: The Hammett Equation

Journal of Chemical Education, 2001
This paper provides a brief introduction to the Hammett equation. A laboratory experiment is described that requires students to determine the pKa of three para-substituted phenols through the use of UV-spectroscopy. A student's individual data are combined with other students' data to provide a class set.
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A relationship between dipole moments and the Hammett equation

Recueil des Travaux Chimiques des Pays-Bas, 1957
AbstractAn empirical formula is proposed relating the constant ω in the Hammett equation to the observed dipole moment of a compound (para‐ or meta‐ C6H4XY). This relationship is checked by using data which have been cited in the literature. These data appear to confirm the proposed linear behaviour when log μ is plotted against σ.
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Hammett Relationship in Oxidase‐Mimicking Metal–Organic Frameworks Revealed through a Protein‐Engineering‐Inspired Strategy

Advanced Materials, 2021
Jiangjiexing Wu, Shuo Zhang, Hang Xing
exaly  

Theoretical Considerations Concerning Hammett's Equation. IV. Calculation of ρ-Values

The Journal of Chemical Physics, 1953
The assumption is made that the effect of a meta or para substituent X on the reactivity of a reacting center Y in a compound [Complex chemical formula] depends only on the electron density change induced by the substituent in the atom at which Y is attached to R.
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On Hepler’s Treatment of the Hammett Equation

Zeitschrift für Physikalische Chemie, 1974
D. K. Hazra, S. C. Lahiri
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Molecular control over vitrimer-like mechanics – tuneable dynamic motifs based on the Hammett equation in polyimine materials

Chemical Science, 2021
Sybren K Schoustra, Joshua A Dijksman, Han Zuilhof   +2 more
exaly  

Significance of Hammett and Taft substituent constants on bonding potential of organic corrosion inhibitors: Tailoring of reactivity and performance

Coordination Chemistry Reviews, 2023
Chandrabhan Verma, Akram M Alfantazi
exaly