A simple strategy to achieve remarkable mechanochromism of cationic Ir(<scp>iii</scp>) phosphors through subtle ligand modification

Zhao, Kai-Yue; Mao, Huiting; Wen, Lili; Shan, Guo‐Gang; Fu, Qiang; Sun, Haizhu; Su, Zhong‐Min

doi:10.1039/c8tc03696a

Cited by 29 publications

(9 citation statements)

References 60 publications

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“…[23] Many pure organic mechanochromic materials with AIE-activem olecules were thus reported, [24][25][26][27][28][29][30][31] along with organoboron complexes. [32,33] Regarding metal-based compounds that combine AIE and mechanochromic properties, few studies have been reported, with examplesb ased on iridium(III), [34][35][36][37][38][39] cadmium(II), [40] zinc(II), [41,42] and gold(I) [43] complexes.…”

Section: Introductionmentioning

confidence: 99%

Aggregation‐Induced Emission Properties of Copper Iodide Clusters

Utrera-Melero

Mevellec

Gautier

et al. 2019

Chemistry An Asian Journal

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The aggregation‐induced emission (AIE) properties of two different copper iodide clusters have been studied. These two [Cu4I4L4] clusters differ by their coordinated phosphine ligand and the luminescent mechanochromic properties are only displayed by one of them. The two clusters are AIE‐active luminophors that exhibit an intense emission in the visible region upon aggregation. The formed particles present luminescent thermochromism comparable to that of the bulk compounds. The observed AIE properties can be attributed to suppression of nonradiative relaxation of the excited states in a more rigid state, in relation to the large structural relaxation of the excited triplet state. The differences observed in the AIE properties of the two clusters can be related to the different ligands. A correlation between the luminescence mechanochromic properties and the AIE effect is not straightforward, but the formation of “soft” molecular solids is a common characteristic that can explain the photoactive properties of these compounds.

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Section: Introductionmentioning

confidence: 99%

Aggregation‐Induced Emission Properties of Copper Iodide Clusters

Utrera-Melero

Mevellec

Gautier

et al. 2019

Chemistry An Asian Journal

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“…The former one is attributed to the π‐π* transitions delocalized along the π‐electronic system. The latter one is assigned to an intramolecular charge transfer (ICT) transition from triphenylamine unit to benzothiazole group [10] . Increasing solvent polarity, the absorption of P1 is not dramatically changed, but the emission color exhibits an obvious red‐shifted from blue (in n‐Hexane λ em =441 nm) to yellow (in dimethylformamide λ em =524 nm) (Figure 1b, 1c, and S1).…”

Section: Resultsmentioning

confidence: 99%

A Multifunctional Triphenylamine–Benzothiazole Derivative with Blue‐Shifted Mechanochromism, Acidochromism and Amplified Spontaneous Emission

et al. 2020

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A multifunctional triphenylamine (TPA) derivative P1 is synthesized, which contains a TPA skeleton and a benzothiazole group. P1 crystals show blue–green fluorescence and exhibit obviously blue‐shifted mechanochromism upon grinding. Analysis of crystal structures indicate that two adjacent antiparallel P1 molecules form strong intermolecular interactions and adopt a dimeric packing structure, which could be interrupted by mechanical stress, leading to blue‐shifted mechanochromism. Moreover, the proton‐donating acid effectively binds onto the benzothiazole moiety, which greatly enhances the electron‐accepting capacity of the benzothiazole moiety, leading to acidochromism with red‐shifted emission. Additionally, self‐assembled P1 microcrystals exhibit good optical waveguide features and this feature indicates P1 microcrystals serve simultaneously as gain materials and optical resonators for laser oscillation.

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“…453 Since then, various mono-and dinuclear Ir(III) complexes with MCL have been developed. 50,109,110,463,[486][487][488][489][490][491][492][493] Interestingly, in most of the cases, AIE and MCL activity are observed simultaneously. This is consistent with the opinion first expressed by Chi"s group, that AIE materials may be a key treasure source for mechanochromic luminescence.…”

Section: Ir(iii) Complexesmentioning

confidence: 98%

“…This is consistent with the opinion first expressed by Chi"s group, that AIE materials may be a key treasure source for mechanochromic luminescence. 445 There are four different types of MCL Ir(III) complexes based on the structure of the ancillary ligand, including alkyl chains, [486][487][488][489][490][491] dendrimer-like, 492 Schiff base 50,109,110 and rigid aromatic ring. 463,493 Fig.…”

Section: Ir(iii) Complexesmentioning

confidence: 99%