Electron Transfers Under Confinement in Channel-Type Zeolites

Solid-State Synthesis of Zeolite-Templated Carbons

“…Note that although the protonated form appeared majorly immediately after mixing, the spectral signature of this form fully overlapped after about 8 days (not shown). The spontaneous ionization of the molecules after adsorption depends not only on the ionization potential of the guest but also on the internal properties of the zeolite host such as the nature of the charge-compensating cation, the acidity, the diameter of the pores inducing a more or less marked confinement effect, which will affect the polarization in the porosity at the sorption sites . In particular, confinement within the pores has been identified as a key factor in stabilizing long-lived separated charge states.…”

Confinement of Luminescent Guests in Metal–Organic Frameworks: Understanding Pathways from Synthesis and Multimodal Characterization to Potential Applications of LG@MOF Systems

“…Over the past two decades, the steady-state and ultrafast photodynamics of the ESPT, CT, and FRET processes have been well documented in different guest−host composites, such as guest encapsulated into different silica-based mesoporous (SBMs) systems. 92,178,179 However, to ensure a sustainable worldwide growth, there is an urgent need of developing more efficient materials that will bring new practical and cost-effective solutions to address the global challenges, such as renewable energy generation and its efficient use, among others. To this end, the tunable physicochemical properties of MOFs have turned them into one of the most promising materials to explore, improve and exploit these excited-state phenomena.…”

“…Excited state proton transfer (ESPT), charge transfer (CT) and Förster resonance energy transfer (FRET) phenomena are key events in many natural (e.g., photosynthesis, biological processes) and mimicked artificial systems (e.g., solar cells, OLEDs, photocatalysis), being the keystone of many of the modern advanced photonic and optoelectronic technologies. − Thus, a proper control and understanding of those excited state mechanisms is paramount for a better development of advanced functional materials, and consequently, for the fabrication of the next generation of optoelectronic and photonic devices. Over the past two decades, the steady-state and ultrafast photodynamics of the ESPT, CT, and FRET processes have been well documented in different guest–host composites, such as guest encapsulated into different silica-based mesoporous (SBMs) systems. ,, However, to ensure a sustainable worldwide growth, there is an urgent need of developing more efficient materials that will bring new practical and cost-effective solutions to address the global challenges, such as renewable energy generation and its efficient use, among others. To this end, the tunable physicochemical properties of MOFs have turned them into one of the most promising materials to explore, improve and exploit these excited-state phenomena.…”

Microporous 3D graphitic carbons obtained by soft templating as carbocatalysts for aerobic oxidation

“…There are precedents in heterogeneous catalysis with inorganic microporous zeolites showing that confinement of the active sites within micropores can lead to an enhancement of the catalytic activity, particularly when there is a tight fit between substrates and reagents and the dimension of the pores. [49] Aimed at providing evidences of the superior catalytic activity of 3DC22 and 3DCβ respect to related unstructured carbon materials, the aerobic oxidation of benzylamine in the absence of solvent was carried out at 80 °C under a flow of oxygen at atmospheric pressure through the system. The results of the catalytic activity are presented in Table 2.…”

“…Evidence will be presented below showing that this is in fact the case, being possible to obtain microporous 3D graphene sponges by using chitosan as graphene precursor that is able to undergo spatial organization by structuring directing agents employed in zeolite synthesis. Due to this 3D structuration in very narrow micropores, the resulting materials exhibit much enhanced catalytic activity derived from the confinement effect [49,50] for aerobic oxidation as compared to analogous unstructured 2D materials.…”