Supporting Information. Additional synthesis methods, electrochemical measurement methods, characterization, crystal data of samples and other Au NCs, additional information of geometric structure, additional schemes, ESI-MS spectra, UV-vis optical absorption spectra, HPLC, PTLC, crystallization, MALDI-MS spectra, FT-XAFS and XANES spectra, TEM image, stability test of LSV, and DPV curves. This material is available free of charge via the Internet at .