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- E-ISSN 2093-8950
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Mass spectrometric studies of competitive binding of C60 and C70 to mesosubstituted porphyrins
Mass Spectrometry Letters / Mass Spectrometry Letters, (P)2233-4203; (E)2093-8950
2011, v.2 no.2, pp.49-52
https://doi.org/10.5478/MSL.2011.2.2.049
(Pohang University of Science and Technology)
(Pohang University of Science and Technology)
(Pohang University of Science and Technology)
Jung,
S., &
Shin,
S.
K.
(2011). Mass spectrometric studies of competitive binding of C60 and C70 to mesosubstituted porphyrins. Mass Spectrometry Letters, 2(2), 49-52, https://doi.org/10.5478/MSL.2011.2.2.049
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Abstract
Competitive binding of C60 and C70 to meso-substituted porphyrins was studied by mass spectrometry (MS). Electrosprayionization MS was employed to acquire the mass spectra of 1 : 1 porphyrin–fullerene complexes formed in a mixture of mesosubstitutedporphyrin and fullerite to determine the ratio of complexes between C60 and C70. Matrix-free laser desorption ionizationMS was used to obtain the mass spectra of fullerite to measure the mole fraction of C60 and C70. The binding constant ratio (K70/K60)was determined from the mass spectral data. The difference in standard Gibbs free energy change, Δ(ΔGo)70–60, for the competitivebinding of C60 and C70 was calculated from K70/K60. Of the five porphyrins, tetraphenyl, tetra(4-pyridyl), tetra(4-carboxyphenyl),tetra(3,5-di-tert-butylphenyl), and tetra(pentafluorophenyl) porphyrins, the first three non-bulky porphyrins yield negative valuesof Δ(ΔGo)70−60, whereas the other two bulky porphyrins result in positive values of Δ(ΔGo)70−60. This result indicates that C70binding to porphyrin is thermodynamically favored over C60 binding in non-bulky porphyrins, but disfavored in bulky ones. Italso suggests that the binding mode of C70 is different between non-bulky and bulky porphyrins, which is in line with previousexperimental findings of the “side-on” binding to non-bulky porphyrins and the C60-like “end-on” binding to bulky porphyrins.
- keywords
- Protonated porphyrin, Fullerene, Porphyrin−fullerene complex, Binding constant
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- Submission Date
- 2011-05-19
- Revised Date
- 2011-06-07
- Accepted Date
- 2011-06-08
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