Chromatographic retention and thermodynamics of the adsorption of α-phenylcarboxylic acid enantiomers on a chiral stationary phase with a grafted antibiotic eremomycin: Effect of eluent pH

Van't Hoff analysis in chiral chromatography

“…Points belonging to mandelic (I), 2‐phenylpropionic (III), and 2‐phenylbutanoic (IV) acids are grouped around one line, and points belonging to α‐methoxyphenylacetic acid (II) are grouped around another line. Reprinted with permission from …”

“…This frequently found in chiral chromatography phenomenon means a correlation between ΔH 0 and ΔS 0 in a series of congeneric experiments with minor structural or conditional variations. (Variable parameters can be the nature and position of Reprinted with permission from [98] substituents in analytes belonging to one family of compounds or the concentration of a mobile phase modifier.) Respective mathematical expression reads [93] Δ 0 = βΔ 0 + Δ 0 β (30) or…”

“…Therefore, EEC is a convenient tool to distinguish groups of analytes interacting with a CSP by different mechanisms. Figure 4 demonstrates how an EEC study revealed a peculiar character of enantioselective interactions of α-methoxyphenylacetic acid with an antibiotic chiral selector, different from other α-phenylcarboxylic acids [98].…”

Compensation Effect in Catalytic Oxidation of Carbon Monoxide

“…The first who found this phenomenon was Constable [8] for dehydrogenation of alcohol using different copper oxide cata-lysts, but it was rediscovered frequently in various fields receiving diverse names: the Barclay-Butler rule [9,10], the Meyer-Neldel effect [11][12][13], the theta rule [14], the Smith-Topley effect [15,16], or Zawadzki-Bretsznajder rule [17]. The compensation effect was found in a wide range of science from heterogeneous catalysis [18][19][20][21] to a variety of other areas of chemistry, namely, gas and liquid chemistry [22,23], coordination chemistry [24], antibiotics dissociation [25], hydrogen bonding [26], solid-phase thermal decomposition [27], degradation of polypropene composites [28], heat exchanger fouling studies [29], lignocellulosic biomass torrefaction [30], and much more [3].…”