Realization of a four-step molecular switch in scanning tunneling microscope manipulation of single chlorophyll-a molecules
Single chlorophyll-a molecules, a vital resource for the sustenance of life on Earth, have
been investigated by using scanning tunneling microscope manipulation and spectroscopy
on a gold substrate at 4.6 K. Chlorophyll-a binds on Au (111) via its porphyrin unit while the
phytyl-chain is elevated from the surface by the support of four CH3 groups. By injecting
tunneling electrons from the scanning tunneling microscope tip, we are able to bend the
phytyl-chain, which enables the switching of four molecular conformations in a controlled …
been investigated by using scanning tunneling microscope manipulation and spectroscopy
on a gold substrate at 4.6 K. Chlorophyll-a binds on Au (111) via its porphyrin unit while the
phytyl-chain is elevated from the surface by the support of four CH3 groups. By injecting
tunneling electrons from the scanning tunneling microscope tip, we are able to bend the
phytyl-chain, which enables the switching of four molecular conformations in a controlled …
Single chlorophyll-a molecules, a vital resource for the sustenance of life on Earth, have been investigated by using scanning tunneling microscope manipulation and spectroscopy on a gold substrate at 4.6 K. Chlorophyll-a binds on Au(111) via its porphyrin unit while the phytyl-chain is elevated from the surface by the support of four CH3 groups. By injecting tunneling electrons from the scanning tunneling microscope tip, we are able to bend the phytyl-chain, which enables the switching of four molecular conformations in a controlled manner. Statistical analyses and structural calculations reveal that all reversible switching mechanisms are initiated by a single tunneling-electron energy-transfer process, which induces bond rotation within the phytyl-chain.
National Acad Sciences
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