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Stereospecific deuteration rates of 2,2′-thiodiacetate (tda) in s-fac- and u-fac-[Co(dien)(tda)]+ were measured at 70.2 °C in D2O (pD range 4.4 – 6.4). The observed rate constants (k′) were proportional to the [OD−]. The large k′/[OD−] value (ca. 3.8 × 106) shows that the protons on the chelated -SCH2COO− ring are much more active than those on the chelated -NHCH2COO− ring.

In an effort to improve and simplify refractive index sensors, we identified a basic operation mode at the critical angle. Sensitivity to the refractive index is higher than in standard surface plasmon resonance sensors, and we have been able to demonstrate analytically that it is virtually an unbounded value. We describe this approach and submit a complete analytical study demonstrating its unlimited sensing power. To test the approach, we constructed an economical and basic sensor. Despite its simplicity, we demonstrated the discrimination capability to be of the order of 10(-6), as far as we know close to the best sensitivity ever recorded. This detection method is generally applicable to any optical system and may pave the way for the next generation of optical sensing devices.