Crystallographic data were collected on a Rigaku Oxford Diffraction XtaLAB Synergy-S dual source diffractometer fitted with a Rigaku HyPix-6000HE HPC (Hybrid Photon Counting) detector, Cu and Mo PhotonJet microfocus X-ray sources, and an Oxford Cryosystems Cryostream 800 cooler maintaining a temperature of 160.0(1) K. Suitable crystals were covered with oil (Infineum V8512, formerly known as Paratone N), placed on a nylon loop that is mounted on a CrystalCap Magnetic™ pin (Hampton Research) and immediately transferred to the diffractometer. The program suite CrysAlis Pro was used for data collection, numerical and multi-scan absorption correction as well, as data reduction. The structures were solved with the dual-space algorithm using SHELXT and were refined by full-matrix least-squares methods on F 2 with SHELXL-2018 using the Olex2 GUI. CCDC 2244246-2244248 contain the supplementary crystallographic data for this paper. These data are provided free of charge by The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/structures. The graphical output was produced with the help of the program Mercury. Guest 1: The adamantyl group is disordered in a ratio of 53: 47. Ill-defined electron density of some co-solvents had to be treated with the SQUEEZE procedure within Platon. Electrochemistry Electrochemical measurements were conducted on a BioLogic SP-150 potentiostat using a threeelectrode set-up. FTO with spin-coated mITO (see experimental) and functionalized host (H) and guest (G) served as the working electrode. A platinum wire was used as the counter electrode, and an AgCl wire in 0.1 M TBAPF6 in THF or MeOH for the measurements in organic solvents, or 0.2 M NaClO4 in H2O for the measurements in aqueous medium was used as a reference electrode. In aqueous medium this reference electrode has a +0.482 V shift vs NHE. The pH of the aqueous solutions was measured with a pH meter. As a reference physisorbed guest on the mITO electrode without the host was measured.