All chemicals were purchased from Tokyo Chemical Industry Co. Ltd., Kanto Chemical Co., or Wako Pure Chemical Industries Ltd., unless otherwise stated. They were used without further purification. HOPG was purchased from Alliance Biosystems Inc. (grade SPI-1, 10 mm × 10 mm × 2 mm) and was cleaved with adhesive tape just before use. Transparent SnO2 electrodes (on indium tin oxide–coated glass, 5 ohms sq−1) were purchased from Geomatec Co. Ltd. They were sonicated in acetone (10 min) and nonionic detergent in water (30 min × 2). Then, the substrates were washed with water until the bubble of the detergent disappeared and sonicated in water (10 min). The cleaned substrates were stored in water and dried by nitrogen flow just before use. The bridging proligands (H2L1 and H2L3) and the homoleptic nanowire (Homo-1) were synthesized according to the previously described methods (38, 43). AFM was performed using an Agilent Technologies 5500 scanning probe microscope under an ambient condition. AFM was performed in high-amplitude mode (tapping mode), with a silicon cantilever Nano World NCH probe. Height profiles were measured in flat regions; data points with heights of >2.9 and <0.4 nm were excluded; we regarded them as irrelevant noise data. UV/vis spectra were recorded on a JASCO V-570 spectrometer. Fluorescence spectra were collected with a Hitachi F-4500 spectrometer. Absolute photoluminescent quantum yields were measured with a Hamamatsu Photonics C9920-02G instrument. Fluorescence lifetime measurements were conducted using a Hamamatsu Photonics Quantaurus-Tau C11367-02 instrument. 1H and 13C nuclear magnetic resonance (NMR) data were collected in CDCl3 and recorded on a Bruker US500 spectrometer. Tetramethylsilane [δH = 0.00 parts per million (ppm)] was used as an internal standard for the 1H NMR spectra, and CDCl3C = 77.00 ppm) was used as an internal standard for the 13C NMR spectra. High-resolution fast-atom bombardment mass spectroscopy (HR-FAB-MS) was performed on a JEOL JMS-700 MStation mass spectrometer. HR electrospray ionization time-of-flight MS (HR-ESI-TOF-MS) was performed on a Waters LCT Premier XE spectrometer. Preparative gel permeation chromatography (GPC) was performed using LC-918 with JAIGEL 1H and 2H column (Japan Analytical Industry) using chloroform as the mobile phase.

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