Liang H.-Q., Guo Y., Shi Y. et al. · Angewandte Chemie - International Edition · 2020 · 7732-7737
Open a family to keep every result attached to its sample, method and conditions.
Paraphrased for this database from the authors’ stated interpretations — never quoted verbatim — and kept separate from reported measurements.
The SSP@ZIF-8-10% membrane can remotely control an LED through a transistor amplification circuit because light/dark proton-conductive resistance changes strongly.
Caveat: The supporting movie was not assigned; extraction relies on main-text quantitative values and still figures.
4-5 · Device demonstration · Figure 4 · Linked to 4 structured results
SSP improves proton conduction only when encapsulated inside ZIF-8 during the solid-confinement conversion, not when absorbed on the external ZIF-8 surface.
Caveat: The externally immersed control is qualitative in the main text and approximate in Figure S7; no raw impedance data were supplied.
2-3 · Results and discussion · Figure S7 · Linked to 3 structured results
The hybrid membranes retain/form the ZIF-8 crystalline phase while containing SSP.
Caveat: No CIF for the membrane is provided; assignment relies on powder XRD and spectroscopy.
2 · Results and discussion · Figure 2 · Linked to 3 structured results
Increasing theoretical SSP loading to 20% lowers conductivity because excess SSP does not raise effective encapsulation but reduces ZIF-8 crystal size and introduces discontinuity/voids.
Caveat: 20% conductivity is a figure-axis estimate; morphology rationale is qualitative.
3 · Results and discussion · Figure 3a; Figure S2 · Linked to 2 structured results
Increasing humidity raises SSP@ZIF-8-10% proton conductivity by providing water for hydrogen-bond networks in the channels.
3 · Results and discussion · Figure 3b · Linked to 2 structured results
Visible light converts MC-form SSP to the SP form, cutting hydrogen-bond networks and lowering proton conductivity; dark storage regenerates MC form and restores high conductivity.
Caveat: The proposed pore-level mechanism is supported by spectroscopy and conductivity switching but not by direct in situ structural observation.
4 · Results and discussion · Figure 3f,g · Linked to 5 structured results
Pristine ZIF-8 follows a Grotthuss-like mechanism, whereas SSP@ZIF-8 membranes show combined Grotthuss and vehicle behaviour due to guest/water hydrogen-bond networks and water self-diffusion.
Caveat: SSP@ZIF-8 per-sample activation energies are not tabulated; the mechanism is inferred from activation-energy ranges and literature thresholds.
3 · Results and discussion · Figure 3c · Linked to 2 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| sulfonated spiropyran (SSP) | 1',3',3'-trimethylspiro[2H-l-benzopyran-2,2'-indoline]-6-sulfonic acid / sulfated spiropyran; final isolated purple solid IIPhotoactive spiropyran molecule with sulfonate and phenol groups in MC form | 0D · UnknownMolecular guest; NMR spectra used to determine SP/MC isomerisation. | 1-2 · Experimental Procedures |
| SSP@ZIF-8 hybrid membraneBrowse family: ZIF-8 / Zn(mIm)₂ | ZIF-8 host with sulfonated spiropyran (SSP) encapsulated in the cavities; effective SSP content of SSP@ZIF-8-10% estimated as 8.1%Zn-based ZIF-8 framework nodes · 2-methylimidazolate framework linker plus guest sulfonated spiropyran molecular valves | 3D · CompositeGuest-loaded ZIF-8 phase; XRD shows ZIF-8 phase, FTIR/XPS/EDS show SSP incorporation, and N2 sorption decreases after loading. | 1-2 · Abstract; Results and discussion · Figure 1; Figure 2 |
| ZIF-8 membraneBrowse family: ZIF-8 / Zn(mIm)₂ | ZIF-8 zinc 2-methylimidazolate framework; empirical formula not explicitly reported in this paperZn nodes generated by conversion of zinc hydroxide nanostrands with 2-methylimidazole · 2-methylimidazolate from 2-methylimidazole (Hmim) | 3D · PristineCrystalline ZIF-8 phase assigned by XRD; pore windows about 3.4 Angstrom and pore cavities about 11.6 Angstrom are cited in the transport discussion. | 2-3 · Results and discussion · Figure 2c |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| Synthesised sulfated spiropyran / SSPresearch_0487__mat__mat_ssp | Powder · Composite Component · Unknown | Purple solid II isolated after reflux, solvent removal, recrystallisation, and drying under reduced pressure. | 1-2 · Synthesis of sulfated spiropyran |
| SSP@ZIF-8-1% membraneresearch_0487__mat__mat_ssp_zif8 | Thin Film · Composite Sample · Guest Loaded | Encapsulated SSP@ZIF-8 membrane with theoretical SSP:ZIF-8 weight ratio 1%.AAO membrane | 2 · Fabrication of SSP@ZIF-8 Membranes on AAO · Figure S2-S4 |
| SSP@ZIF-8-10% membraneresearch_0487__mat__mat_ssp_zif8 | Thin Film · Target Sample · Guest Loaded | Encapsulated SSP@ZIF-8 membrane with theoretical SSP:ZIF-8 weight ratio 10%; effective SSP content estimated as 8.1%.AAO membrane · around 500 nm | 2 · Results and discussion · Figure 2 |
| SSP@ZIF-8-10% membrane with Ag electrodes for impedance and LED switchingresearch_0487__mat__mat_ssp_zif8 | Electrode · Target Sample · Composite | Two Ag electrodes evaporated onto membrane surface, then connected to impedance workstation or amplification circuit.AAO membrane with evaporated Ag electrodes; connected by conductive silver adhesive and wire · Ag electrode gap length 3 mm; gap width 300 um | 3,6 · Proton Conductivity Evaluation · Figure S6 |
| SSP@ZIF-8-20% membraneresearch_0487__mat__mat_ssp_zif8 | Thin Film · Composite Sample · Guest Loaded | Encapsulated SSP@ZIF-8 membrane with theoretical SSP:ZIF-8 weight ratio 20%; excess loading caused smaller ZIF-8 crystals, discontinuity, and voids.AAO membrane | 3 · Results and discussion · Figure S2 |
| SSP@ZIF-8-5% membraneresearch_0487__mat__mat_ssp_zif8 | Thin Film · Composite Sample · Guest Loaded | Encapsulated SSP@ZIF-8 membrane with theoretical SSP:ZIF-8 weight ratio 5%.AAO membrane | 2 · Fabrication of SSP@ZIF-8 Membranes on AAO · Figure S2-S5 |
| ZIF-8 membrane after external SSP immersionresearch_0487__mat__mat_zif8 | Thin Film · Pristine Control · Guest Loaded | Pristine ZIF-8 membrane immersed in 10 mL 0.03 wt% SSP aqueous solution for 12 h.AAO membrane | 2 · Results and discussion · Figure S7 |
| Pristine ZIF-8 membrane on AAOresearch_0487__mat__mat_zif8 | Thin Film · Pristine Control · Pristine Framework | ZIF-8 membrane prepared by solid confinement conversion of zinc hydroxide nanostrands with Hmim; Ag electrodes added for conductivity measurements where needed.anodic alumina oxide (AAO) membrane, average pore size 200 nm and porosity 50% | 2 · Results and discussion · Figure 2 |