Saunders exponents

Saunders Exponents Mixed Multiple Isotope Probes... 

The exponents described by Saunders, sometimes called mixed isotopic exponents , are shown in Eq. (11.17). The exponent describes the relationship between the H/T isotope effect from substitution at site one (determined when protium is at site two), and the site-one D/T isotope effect (determined when deuterium is at site two). If the two sites are distinguished as giving primary and secondary isotope effects, the first exponent in Eq. (11.17) resembles the single-site Swain-Schaad exponent Eq. (11.9) for a primary isotope effect, and the second exponent in Eq. (11.17) resembles a single-site secondary Swain-Schaad exponent. However, the mixed isotopic exponents necessarily involve isotopic substitution at two sites and should not be confused with single-site Swain-Schaad exponents. 

Figure 11.11. Example of competitive experiments used by Saunders et al. [89, 97] to measure isotope effects for mixed-isotope exponent determinations. The primary and secondary isotope effects were determined using the starting tritium activities of the bromide substrate, the product styrene, and the solvent ethanol, all at a kno A/n fractional...

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