Crystalline‐Phase‐Recognition‐Induced Domino Phase Transition and Luminescence Switching for Advanced Information Encryption

Abstract

Herein, anew mechanism, namely,crystalline phase recognition (CPR), is proposed for the single-crystal-to-singlecrystal (SCSC) transition of metal halides.C hiral b-[Bmmim] 2 SbCl 5 (Bmmim = 1-butyl-2,3-methylimidazolium) can recognizea chiral a- [Bmmim] 2 SbCl 5 on the basis of akey-lock feature through intercontact of their single crystals, resulting in ad omino phase transition (DPT). The concomitant photoluminescence (PL) switching enables observation of the DPT in situ. The liquid eutectic interface,s tress-strain transfer,a nd feasible thermodynamics are key issues for the CPR. DFT calculations and PL measurements revealed that the optical absorption and emission of the isomers mainly originate from [SbCl 5 ] 2À anions.T he structural effects (e.g., supramolecular interactions and [SbCl 5 ] 2À distortion) on the optical emission are clarified. As an ovel type of stimuli response,t he CPR-induced DPT and luminescence switching exhibit potential for application in advanced time-resolved information encryption.

Nearly one-fold enhancement in photoluminescence quantum yield for isostructural zero-dimensional hybrid antimony(iii) bromides by supramolecular interaction adjustments

“…Supramolecular interactions such as hydrogen bonding are widely presented in hybrid metal halides and would heavily influence their photoluminescence properties; 30,32–38 thus, we deeply analysed the hydrogen bonding of 1·EtOH-Br and 1·MeCN-Br and studied the reason for PLQY enhancement. There are abundant hydrogen bonds among inorganic [SbBr 5 ] 2− anions, organic [EtPPh 3 ] + cations and solvent molecules.…”

“…According to previous studies, STEs correlate well with the distortion level of an inorganic polyhedron in 0D OIMHs. 9,16,19,22,26,37,38,[57][58][59][60][61] Herein, the relationship between structures and PL performances is discussed by calculating the distortions of inorganic [SbBr 5 ] 2− anions. The distortions based on Sb-Br bond lengths and Br-Sb-Br angle variances are defined as follows.…”

“…Thus, the enhancement of the PLQYs of 0D HABs is urgently required. Considering that supramolecular interactions such as hydrogen bonding in hybrid metal halides could heavily influence their photoluminescence properties, 30,[32][33][34][35][36][37][38] we attempt to improve the PLQYs of 0D HABs through adjusting the supramolecular interactions.…”

Structural transformation of copper coordination complexes accompanied with chiral transformation

“…However, structural transformation accompanied by chiral transformation (from achiral to chiral single crystal or from chiral to achiral single crystal) is rarely explored, even though abundant research on structural transformation has been reported. 52–56…”

“…However, structural transformation accompanied by chiral transformation (from achiral to chiral single crystal or from chiral to achiral single crystal) is rarely explored, even though abundant research on structural transformation has been reported. [52][53][54][55][56] In our previous work, MOF-74 structures were obtained by the self-assembly of 5-substituted salicylaldehyde derivatives and copper perchlorate, which realized the efficient catalytic conversion of carbon dioxide to cyclic carbonate under atmospheric pressure. 57 Here, as an extension of our study, 4-substituted salicylaldehyde derivatives NaHL (NaHL = sodium (E)-2-((4-fluoro-2-hydroxybenzylidene)amino)acetate) and copper nitrate were used to research the structural transformation during the reaction progress.…”