Vapor-, thermo-, and mechanical-grinding-triggered tri-stimuli-responsive luminescence switching of cycloplatinated(II) complex bearing 8-quinolinol derivatives

Ni, Jun; Liu, Gao; Su, Mengmeng; Zheng, Wei; Zhang, Jianjun

doi:10.1016/j.dyepig.2020.108451

Cited by 19 publications

(3 citation statements)

References 77 publications

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“…Platinum(II) square-planar complexes have emerged as an important class of stimuli-responsive luminescent molecular solids. − The vast majority of the reported luminescence color responses of Pt(II) complexes to external stimuli, such as mechanical stress and chemical vapors, relies on the variation of the supramolecular Pt–Pt and/or π–π interactions. The Pt–Pt interactions are conducted via the d z 2 orbitals, and the distance between the Pt atoms determines the degree of the orbital overlapping and thus the energy of the MMLCT (metal-metal-to-ligand charge-transfer) transition. , When the MMLCT state does not come into play as a result of negligible Pt–Pt interactions, the formation of excimer via ligand-centered π–π stacking interactions has been an alternative mechanism for tuning the luminescence color. − Despite the good understanding of the structure–property relationship associated with the Pt–Pt and π–π interactions, it remains a great challenge to design a Pt(II) complex of high-contrast mechanochromic and vapochromic luminescence properties.…”

Section: Introductionmentioning

confidence: 99%

Steric Engineering of Cyclometalated Pt(II) Complexes toward High-Contrast Monomer–Excimer-Based Mechanochromic and Vapochromic Luminescence

et al. 2020

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Ligands play a crucial role in the supramolecular photoluminescence properties of Pt(II) square-planar complexes. To improve the luminescence color responses of N∧C∧N cyclometalated Pt(II) complexes to external stimuli such as mechanical stress and chemical vapors, we have conducted a steric engineering of the previous systems 1a–1d [Inorg. Chem. 2017, 56, 4978–4989] by introducing two tert-butyl groups to the tridentate ligand to form complexes 2a–2c. Unlike the “too low” or “too high” steric hindrance of the NCNPt core in 1a–1d, the combined steric effects of the tert-butyl groups at one side and the pentiptycene group at the other side of the NCNPt core in 2b are “just right” for generating as-prepared powders with pure monomer (green) emission or pure excimer (red) emission, depending on the rate of precipitation from solutions. The synergistic steric effects are also beneficial to the solid-state luminescence quantum efficiency (30–36%). As a result of the differences in steric interactions and thus in the relative monomer vs excimer emission intensity, each complex of 2a–2c performs a two-step luminescence mechanochromism and vapochromism with different color patterns. This work provides an intriguing example of steric engineering of Pt(II) complexes toward highly emissive molecular solids with high-contrast mechanochromic and vapochromic luminescence.

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Section: Introductionmentioning

confidence: 99%

Steric Engineering of Cyclometalated Pt(II) Complexes toward High-Contrast Monomer–Excimer-Based Mechanochromic and Vapochromic Luminescence

et al. 2020

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“…16 At present, many solvochromic or vapochromic Pt( ii ) complexes have been exploited, 17 exhibiting either reversible 18–20 or irreversible stimuli-response. 21,22 Nevertheless, there is still high demand for developing new systems with stimuli-responsive Pt( ii ) complexes in order to further promote their wide applications. 23…”

Section: Introductionmentioning

confidence: 99%

“…16 At present, many solvochromic or vapochromic Pt(II) complexes have been exploited, 17 exhibiting either reversible [18][19][20] or irreversible stimuli-response. 21,22 Nevertheless, there is still high demand for developing new systems with stimuliresponsive Pt(II) complexes in order to further promote their wide applications. 23 In general, the stimuli-responsive Pt(II) complexes towards small organic molecules are attributed to changes in the stacking arrangement within the crystal, leading to a change in the Pt-Pt interaction.…”

Section: Introductionmentioning

confidence: 99%

Reversible and irreversible stimuli-responsive chromism of a square-planar platinum(ii) salt

Li,

Guan,

et al. 2023

RSC Adv.

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Stimuli‐Responsive Optical Materials Based on Hypervalent Antimony‐Containing Conjugated Molecules

Tanimura,

Gon,

Tanaka

et al. 2024

Adv Funct Materials

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Stimuli‐responsive materials have been applied for sensor devices because they can transform and amplify various target stimuli into observable signals. Much effort has been devoted to exploring effective molecular designs for obtaining stimuli‐responsive behaviors by taking advantage of the unique optoelectronic properties of π‐conjugated molecules involving various elements. This study focuses on the modulation of the electronic state of the π‐conjugated scaffolds by the oxidation number change of the hypervalent antimony. This study demonstrate that the strength of the intramolecular interaction between hypervalent antimony and the π‐conjugated framework can be tuned with ligand structure, substituent effect, and oxidation number shifts of hypervalent antimony. In particular, the color changes represented by hypsochromic and bathochromic wavelength shifts of optical bands are achieved by the oxidative reaction of hypervalent antimony in the solid state. Significantly, the direction of the color changes can be confidently predicted by quantum chemical calculations. The findings, based on the electronic interaction between π‐conjugated scaffolds and hypervalent main‐group elements, provide logical design strategies for advanced stimuli‐responsive materials.

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Vapor-, thermo-, and mechanical-grinding-triggered tri-stimuli-responsive luminescence switching of cycloplatinated(II) complex bearing 8-quinolinol derivatives

Cited by 19 publications

References 77 publications

Steric Engineering of Cyclometalated Pt(II) Complexes toward High-Contrast Monomer–Excimer-Based Mechanochromic and Vapochromic Luminescence

Steric Engineering of Cyclometalated Pt(II) Complexes toward High-Contrast Monomer–Excimer-Based Mechanochromic and Vapochromic Luminescence

Reversible and irreversible stimuli-responsive chromism of a square-planar platinum(ii) salt

Stimuli‐Responsive Optical Materials Based on Hypervalent Antimony‐Containing Conjugated Molecules

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