We demonstrate herein a promising pathway towards low-energy CO2 capture and release triggered by UV and visible light. A photosensitive diarylethene ligand was used to construct a photochromic diarylethene metal-organic framework (DMOF). A local photochromic reaction originating from the framework movement induced by the photoswitchable diarylethene unit resulted in record CO2-desorption capacity of 75% under static irradiation and 76% under dynamic irradiation.

The recruitment of specific cytosolic proteins to intracellular membranes through binding phosphorylated derivatives of phosphatidylinositol (PtdIns) controls such processes as endocytosis, regulated exocytosis, cytoskeletal organization, and cell signaling. Protein modules such as FVYE domains and PH domains that bind specifically to PtdIns 3-phosphate (PtdIns-3-P) and polyphosphoinositides, respectively, can direct such membrane targeting. Here we show that two representative Phox homology (PX) domains selectively bind to specific phosphatidylinositol phosphates. The PX domain of Vam7p selectively binds PtdIns-3-P, while the PX domain of the CPK PI-3 kinase selectively binds PtdIns-4,5-P(2). In contrast, the PX domain of Vps5p displays no binding to any PtdInsPs that were tested. In addition, the double mutant (Y42A/L48Q) of the PX domain of Vam7p, reported to cause vacuolar trafficking defects in yeast, has a dramatically decreased level of binding to PtdIns-3-P. These data reveal that the membrane targeting function of the Vam7p PX domain is based on its ability to associate with PtdIns-3-P, analogous to the function of FYVE domains.

It is of great significance to develop creative proton exchange membrane materials for proton exchange membrane fuel cells (PEMFCs). The strategy of doping metal–organic frameworks (MOFs) with guest molecules into the Nafion matrix is adopted to improve the electrochemical performance of Nafion hybrid membranes. Various and abundant hydrogen bonds can make a tremendous contribution to the proton conduction of hybrid membranes. In this work, we used high proton-conducting Zn-MOFs with the characteristics of host–guest collaborative hydrogen bonds as the filler to prepare Zn-MOF/Nafion hybrid membranes. Alternating current (AC) impedance tests show that when the doping amount of Zn-MOF is 5%, the proton conductivity reaches 7.29 × 10–3 S·cm–1, being 1.87 times that of the pure Nafion membrane at 58% relative humidity (RH) and 80 °C. In an attempt to prove the promotion effect of guest NH3 on proton conductivity of Nafion hybrid membranes, Zn-MOF-NH3 was filled into the Nafion matrix. Under the same conditions, its proton conductivity reaches the maximum value of 2.13 × 10–2 S·cm–1, which is 5.47 times that of the pure Nafion membrane. Zn-MOF-NH3/Nafion-5 was used to fabricate a proton exchange membrane for application in H2/O2 fuel cells. The maximum power density of 212 mW cm–2 and a current density of 630 mA cm–2 reveal a respectable single cell performance. This study provides a promising method for optimizing the structure of MOF proton conductors and inspires the preparation of high-performance Nafion hybrid membranes.

As a fascinating information storage device, organic transistor memory based on molecular charge storage elements (MCSEs) has attracted great research interest. However, the charge storage mechanism of MCSEs is ambiguous due to their complex charge dynamic behaviors. Herein, the dipole moment effects on the charge trapping process and the performance of transistor memory are revealed based on cruciform spiro[fluorene-9,9′-xanthene] (SFXs), incorporating cyano moieties, as the typical electronwithdrawing substitution. The characterization of electrostatic potential (ESP) calculation, UV−vis, photoluminescence, and crystallography of SFXs shows the SFXs MCSEs with weaker dipole moment through symmetrical substitution. A series of prototype transistor memories based on SFXs exhibit an erasable type feature with smart photoresponsive behavior. The weaker dipole moment ones possess larger memory window (∼40 V), higher charge trapping density (>1 × 10 13 cm −2 ), and higher programming speed (10 14 −10 11 cm −2 s −1 ). The hole trapping process is dominated by the dipole moment rather than the charge dissipation when compared with different SFXs at the same HOMO level. Rather good charge retention property (>10 4 s) and large on/off ratio (∼10 4 ) are obtained by blending SFXs with polymer dielectrics in optimized devices. The dipole moment effects on the charge trapping behavior provide not only the design of high performance transistor memory but also the smart information encryption in future data storage. ■ INTRODUCTIONOrganic memory devices have attracted extensive attention for the future information storage toward the era of big data and flexible electronics on account of their good scalability, light weight, and low-cost fabrication process. 1−4 The nonvolatile organic field-effect transistor (OFET) memory is one of the most striking devices with nondestructive read-out and multibit storage property, whose conductivity can be easily manipulated by tuning the charge behavior between the channels. 5−7 Furthermore, the open channel of FET configuration facilitates the charge tuning through the external stimulation such as light irradiation and gas or biomaterial exposure, leading to remarkable smart responsive behavior. 8−11 The thorny challenge in OFET memory is the design of trapping element and getting deep insight into the trapping mechanism with high density and long-term charge maintenance.The molecular charge storage elements (MCSEs) have great superiority in charge density over the well-investigated nanofloating gate 12−15 with a designable molecular structure, flexible synthesis, and tunable bandgap. 16,17 However, the memory performance is dominated not only by the F−N (Fowler−Nordheim) tunneling barrier between the transport layer and MCSEs but also by several other factors. 18−20 Because of the polymorphic behavior in the condensed state, the polymer-based MCSEs are ambiguous in charge trapping mechanism; meanwhile, they have several drawbacks such as multistep synthesis and uncontrollable molecular we...