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The 2:2:1:1 area ratios are expected for the alternate arrangement of the wheel, whilst the 2:2:2 area ratios are expected for the cone arrangement. In previous investigations, both free and complexed 3 appeared to be present in the former conformation, both in solution and in the solid state; moreover, the intercon version between the two alternate conformations appeared to be fast both in the free wheel and in the presence of simple alkylviologen ion guests (see ref. 4). On the other hand, molecular models suggest that conformational interconversion is somewhat hindered, but still possible, in the case of 1.
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The 2:2:1:1 area ratios are expected for the "alternate" arrangement of the wheel, whilst the 2:2:2 area ratios are expected for the "cone" arrangement. In previous investigations, both free and complexed 3 appeared to be present in the former conformation, both in solution and in the solid state; moreover, the intercon version between the two "alternate" conformations appeared to be fast both in the free wheel and in the presence of simple alkylviologen ion guests (see ref. 4). On the other hand, molecular models suggest that conformational interconversion is somewhat hindered, but still possible, in the case of 1.
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77949370436
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In some cases, fragment ions derived from the wheel have also been detected. Their guessed structure and the used symbols are reported in ESI†
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In some cases, fragment ions derived from the wheel have also been detected. Their guessed structure and the used symbols are reported in ESI†.
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31
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12344292813
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Complexation with molecular tweezers has been reported to stabilize viologen dications which are intrinsically unstable in the high vacuum of a mass spectrometer and are not detected at all as unfragmented naked species, see: C. A. Schalley, C. Verhaelen, F.-G. Klärner, U. Hahn and F. Vögtle, Angew. Chem, Int. Ed, 2005, 44, 477. Interestingly, in the spectrum of compound 5 we also detected only fragment monocations see Experimental
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Complexation with molecular tweezers has been reported to stabilize viologen dications which are intrinsically unstable in the high vacuum of a mass spectrometer and are not detected at all as unfragmented "naked" species, see: C. A. Schalley, C. Verhaelen, F.-G. Klärner, U. Hahn and F. Vögtle, Angew. Chem., Int. Ed., 2005, 44, 477. Interestingly, in the spectrum of compound 5 we also detected only fragment monocations (see Experimental).
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See ref. 6, third citation
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See ref. 6, third citation.
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