Chemistry Reference
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FIGURE 7.3
Absorption spectra of the HPLC peaks E, A, B, C, and D in
Figure 7.2
.
incomplete separation of the two HPLC peaks. A similar HPLC chroma-
togram was obtained in toluene solution. It is well known that hydrogen
atoms of C
2n
H
2
polyynes are easily substituted by Cu, leading to preci-
pitation of C
2n
Cu
2
by the addition of Cu
2
Cl
2
. When Cu
2
Cl
2
was added to the
solution, HPLC peaks A-E greatly reduced their intensities. These findings
give a further evidence that HPLC peaks A-E were associated with C
2n
H
2
polyynes.
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