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. Author manuscript; available in PMC: 2011 Jul 9.
Published in final edited form as: Angew Chem Int Ed Engl. 2010 Dec 17;49(51):9926–9929. doi: 10.1002/anie.201005228

Figure 2.

Figure 2

ESIMS spectrum of the isolated SP [D3]TpT and SP [D4]TpT complexes in the negative ionization mode. The ESIMS spectrum recorded in the positive mode can be found in the Supporting Information. The [M−H]− signal at m/z 548.1 corresponds to the SP [D3]TpT species. The [M−H]− signal at m/z 549.2 corresponds to a combination of SP [D4]TpT and the first isotopic peak of SP [D3]TpT, which is predicted to be 22.4% of the signal intensity of the SP [D3]TpT species. Subtraction of the isotopic contribution of SP [D3]TpT from the signal strength of the peak at m/z 549.2 resulted in the contribution of SP [D4]TpT to the signal intensity. Comparison of this number with the intensity of the peak at m/z 548.1 yielded the primary isotope effect of 3.5.