5 – 7 To establish permanent porosity of HOFs, a common strategy is to employ π-conjugatedĪromatic moieties as building blocks, which are usually good organic luminogens. 1 – 4 HOFs show promising applications, including gas separation, catalysis, biological,Īnd optical materials but suffer from porous instability due to weak noncovalent interactions. Porous materials, constructed by discrete organic units through hydrogen-bonding interactions,įurther stabilized by π⋯π interactions, van der Waals (vdW) interactions, and other Hydrogen-bonded organic frameworks (HOFs) are an emerging class of multifunctional Strategy for engineering future multifunctional HOFs but also enriches the types andĪpplications of existing luminescent porous materials. Of the ML-active 8PCOM framework is observed without UV irradiation, and the ML-activeĬrystals can be easily prepared and regenerated.

Through supramolecular dipole moment regulation. During reversible structural transformations of variousĨPCOM frameworks with different pores, the significant ML property is achieved successfully Thus, guest-inducedīreathing behaviors are mainly attributed to phenyl rotations of polar molecular rotors Occur, including a single-crystal-to-single-crystal (SCSC) transformation. Reversible structural transformations between ML-active and -inactive 8PCOM frameworks When responding to different solvent vapors, HOF with permanent porosity, named 8PCOM, assembled from polar molecular rotors withĪn aggregation-induced emission property. Herein, we report the first example of an ML-active flexible HOFs with the mechanoluminescence (ML) property can emit light without photonĮxcitation and are greatly attractive for advanced applications, but research in thisĪrea has been limiting. Potassium 40 - Le potassium 40, noté 40K, est l isotope du potassium dont le nombre de masse est égal à 40 : son noyau atomique compte 19 protons et 21 neutrons.Luminescent hydrogen-bonded organic frameworks (HOFs) have attracted increasing attentionĭue to their corresponding luminescence that enables readily visualization of structuralĭynamics. a silvery white metallic element that oxidizes rapidly in the air and whose compounds are used as fertilizer and in special hard glasses. a soft, silver white, waxlike metallic chemical element, one of the alkali metals, that oxidizes… … English World dictionary Potassium - ► NOUN ▪ a soft silvery white reactive metallic element of the alkali metal group. kalium potash, from Arabic al qaliy the… … Etymology dictionary Potassium - metallic element, 1807, coined by English chemist Sir Humphrey Davy (1778 1829) from Mod.L.

Highly reactive, chemically, it resembles sodium in its … Elements of periodic system

Occurs naturally in seawater and a many minerals. Potassium - Symbol: K Atomic number: 19 Atomic weight: 39.0983 Soft silvery metallic element belonging to group 1 of the periodic table (alkali metals). Potassĭum - Potassĭum, soviel wie Kalium … Meyers Großes Konversations-Lexikon Atomic weight … The Collaborative International Dictionary of English (Chem.) An Alkali element, occurring abundantly but always combined, as in the chloride, sulphate, carbonate, or silicate, in the minerals sylvite, kainite, orthoclase, muscovite, etc. Potassium - Argon ← Potassium → Calcium Na … Wikipédia en Français Son symbole chimique… … Encyclopédie Universelle Il a été découvert en 1807 par Humphry Davy lors de la réduction électrolytique de la potasse caustique fondue (KOH). POTASSIUM - Le potassium, troisième élément de ce groupe, possède les propriétés caractéristiques des métaux alcalins. The name potassium comes from the word potash, as potassium was first isolated from potash. qalīy), atomic number 19, and atomic mass 39.0983. Potassium - (pronEng|pəˈtæsiəm) is a chemical element.

Potassium atom