**2. Materials and Methods**

To analyze the host–guest complexation between Q[7] and C0/C2/C4/C6, 2.0–2.5 × 10−<sup>3</sup> mmol solutions of Q[7] in 0.5–0.7 mL D2O with Q[7]:C0/C2/C4/C6 ratios ranging between 0 and 2 were prepared. All 1H NMR spectra including those for the titration experiments were recorded at 298.15 K on a JEOL JNM-ECZ400S 400 MHz NMR spectrometer (JEOL, Akishima, Japan) in D2O. D2O was used as a field-frequency lock, and the observed chemical shifts were reported in parts per million (ppm).

All UV–Visible spectra were recorded from samples in 1 cm quartz cells on an Agilent 8453 spectrophotometer, equipped with a thermostat bath (Hewlett Packard, CA, USA). The host and guests were dissolved in distilled water. UV–Visible spectra were obtained at 25 ◦C at a concentration of 2.00 × 10−<sup>5</sup> mol·L−<sup>1</sup> Ci (i = 0, 2, 4, 6) and di fferent Q[7] concentrations for the Q[7]@Ci (i = 0, 2, 4, 6) system. The MALDI-TOF mass spectra were recorded on a Bruker BIFLEX III mass spectrometer with α-cyano-4-hydrox-ycinnamic acid as the matrix.
