Abhijeet K. Chaudhari

Guest and anion dependent: Structural dynamism and luminescence of a cationic porous framework (see picture) are investigated by different analytical techniques, such as single-crystal-to-single-crystal structural transformation. The compound shows size-selective sorption of hydrophobic guest molecules, easy exchange of anions of the framework, and interesting anion-responsive luminescence. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

Gast- und anionenabhängig: Strukturdynamik und Lumineszenz eines kationischen porösen Gerüsts (siehe Bild) wurden durch verschiedene Analysetechniken untersucht. Die Verbindung adsorbiert hydrophobe Gastmoleküle abhängig von ihrer Größe, tauscht leicht Anionen des Gerüsts und zeigt anionenabhängige Lumineszenz. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

On the move: Two isostructural, homochiral Cu(II) coordination frameworks based on amino acids (D- and L-PGA) were synthesized. Dynamic behavior by solid-state structural transformation in single-crystal-to-single-crystal fashion was demonstrated. The extent of structural dynamism was shown by guest inclusion studies. Reversible sol-gel formation and anion-tuning morphology of the compounds is also discussed.

<div><div><div><p>Luminescent metal-organic frameworks (MOFs) offer a multifunctional platform for engineering non-invasive sensors and tuneable optoelectronics. However, multichromic materials that are photophysically resilient and show high sensitivity towards different physical and chemical stimuli are scarce. We report a facile host-guest nanoconfinement strategy to construct a hybrid material with multichromic sensing capabilities. We design and fabricate a new Guest@MOF material: comprising a zeolitic MOF (ZIF-71), acting as a nanoporous host for encapsulating rhodamine B (RhB) guest molecules, resulting in the RhB@ZIF‑71 system with mechanochromic, thermochromic, and solvatochromic sensing response. The multichromic properties stem from the nanoconfinement effect that ZIF-71 imposes on RhB monomers, yielding the H-type or J-type aggregates with tuneable photophysical and photochemical properties. For mechanochromism, the external pressure causes an emission red shift in a linear fashion, switching the RhB guests from H-type to J-type aggregates <i>via</i> a shear mechanism. For thermochromism, we demonstrate a linear scaling as a function of temperature due to the spatial restriction experienced by J-type aggregates incarcerated in ZIF-71 pores. Harnessing the solvatochromism of RhB@ZIF‑71, we identified three diverse groups of volatile organic compounds. The multimodal response could pave the way to smart applications like photonic pressure sensors, non-invasive thermometers, and ultrasensitive chemosensors.</p></div></div></div>

Supra-MOF assemblies are the assemblies within the assembly. Metal-organic frameworks are nothing but the molecular self-assemblies of metal cations and organic linker anions, which may transition via the initial weak interaction assembly. A part of the molecular self-assembly may further develop into the islands of polycrystalline MOF particles surrounded by weakly interacting assembly. This has been evident from the previous reports on the supra-MOFs. Here in this report, we represent the dynamics of supra-MOF assembly constituting Zn(II) and Benzimidazole (BIm) that eventually results into the crystalline ZIF-7 compound. Results obtained in this work manifests the potential synthetic strategy for generating functional materials serving applications from different realms.