Related experiments were carried out also for Ru-CTF, giving similar results (See SI, Fig. , S6, S8, S9). Additionally, electrochemical experiments were carried out for Ru-CTF, which showed similar redox properties as [Ru(tda)(py)2] ,further supporting the coordination of the Ru center into the dangling pyridine of the initial CTF framework (Fig. ). This was also supported by Ru K-edge X-ray absorption (XAS) spectroscopy, including both the edge and the extended X-ray absorption fine structure (EXAFS) regions, which are sensitive to the oxidation state and the coordination environment around the metal center, Figure (see also Figure and Table ).