Mechanochromism and Polymorphism-Dependent Emission of Tetrakis(4-(dimethylamino)phenyl)ethylene

Qi, Qingkai; Zhang, Jibo; Xu, Bin; Li, Bao; Zhang, Sean Xiao‐An; Tian, Wenjing

doi:10.1021/jp407965a

Cited by 140 publications

(50 citation statements)

References 55 publications

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“…2,6,[20][21][22] More recently, Tian et al have reported that tetrakis(4-(dimethylamino)phenyl) ethylene (TDMAPE), which has a natural propeller structure, displays a red-shi in emission due to a change in intramolecular conformation when powders of the material are ground. 23 The blue-shied emission of the pristine powders can be fully recovered by fuming with solvent or partially recovered by annealing. 23 Diuoroboron b-diketonate (BF 2 bdk) dyes are another class of materials known for their impressive optical properties.…”

Section: Introductionmentioning

confidence: 99%

Mechanochromic luminescence of halide-substituted difluoroboron β-diketonate dyes

2015

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Many difluoroboron b-diketonate (BF 2 bdk) compounds display mechanochromic luminescence (ML) and substituents can influence their optical properties. For example, the difluoroboron iododibenzoylmethane derivative, BF 2 dbm(I)OC 12 H 25 , exhibits mechanochromic luminescence quenching (MLQ). When annealed films of this dye are smeared under air, the perturbed region becomes dim under UV light. In this study, effects of differing halide substituents on ML were investigated. A series of dyes of the form BF 2 dbm(X)OC 12 H 25 , where X ¼ H, F, Cl, Br, and I, were synthesized. The luminescence properties of these dyes were studied in CH 2 Cl 2 solution, as films on weighing paper, spin-cast films on glass substrates, and as bulk powders. All of the dyes exhibit ML and MLQ. Solid-state emissions from these dyes are also sensitive to annealing temperature. The F, Cl, and Br dyes required higher annealing temperatures than the H and I analogues to achieve ordered emissive states. Spin-cast films of the dyes on glass were studied using atomic force microscopy (AFM) and X-ray diffraction (XRD), revealing a change from an amorphous material in the as-spun state to an ordered, crystalline material after annealing, with the F and Cl dyes showing a propensity to form large lamellar crystallites. Powders were also investigated using XRD and showed changes in diffraction patterns corresponding to thermal annealing and grinding. Finally, halogen substituents greatly diminished the ability of the dye films to recover their ordered emissive states after smearing under ambient conditions. These dyes could be useful for applications in which a more permanent inscription is desirable.

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Section: Introductionmentioning

confidence: 99%

Mechanochromic luminescence of halide-substituted difluoroboron β-diketonate dyes

2015

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“…On the contrary, the shift in the color of the polymorphs of 1 may be ascribed to different π-π stacking between adjacent calixarene dimer units, as 1 adopts the same conformation. [31][32][33][34][35] Combining AIE with control of packing arrangement to produce materials that exhibit stimuli-responsive switching between two or more solid phases with different emission characteristics still remains a challenge, [35][36][37][38][39] and would provide potential applications for smart materials. [40,41] The blue emitting crystals of 1 suffered thermal treatment for the sake of stimuli-responsive behavior.…”

Section: Resultsmentioning

confidence: 99%

Building Functional Materials via Self-assembly of Calixazacrowns

Oueslati

2015

Materials Today: Proceedings

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“…1,2 On the basis of the stimuli involved chromism can be categorized in more than 15 ways including thermochromism, 3 electrochromism, 4-8 mechanochromism, 9 vapochromism, 7 proton-induced chromism, 2 etc. 10 These stimuli can persuade noteworthy changes in a variety of intrinsic physical properties of the materials that lead to potential applications in various fields.…”

Section: Introductionmentioning

confidence: 99%

First observation of reversible mechanochromism and chromaticity study on calcium–copper–titanate

Raval

Pansara

Vasoya³

et al. 2019

J Am Ceram Soc

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First ever intriguing reversible mechanochromism espied in and chromaticity study on polycrystalline CaCu3Ti4O12 composition milled up to 16 hours are reported. The composition changes its color from blackish‐brown (un‐milled sample)‐reddish‐brown (1 hours milled sample)‐ heina‐green (6 hours milled sample)‐spinach‐green (16 hours milled sample) mainly due to the phase separation and corresponding change in band‐gap energy on milling. The UV‐Vis spectra show three observable absorption edges correspond to dx2-y2↔ditalicxy, dx2-y2↔dz2, and dx2-y2↔ditaliczx, dyz transitions. A marked mechanochromic effect with crystallite size reduction is explained in the light of the difference in the site group symmetry of CuO4 and ligand‐metal charge transfer coupled with Cu2+ d‐d transitions. The observed mechanochromism is reflected and well supported by photoluminescence spectral analysis. CIE chromaticity coordinates are located in the light blue region for an un‐milled sample and violet color region for 6 hours milled sample. The profound correlation between the structural and optical properties has been revealed.

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Mechanochromism and Polymorphism-Dependent Emission of Tetrakis(4-(dimethylamino)phenyl)ethylene

Cited by 140 publications

References 55 publications

Mechanochromic luminescence of halide-substituted difluoroboron β-diketonate dyes

Mechanochromic luminescence of halide-substituted difluoroboron β-diketonate dyes

Building Functional Materials via Self-assembly of Calixazacrowns

First observation of reversible mechanochromism and chromaticity study on calcium–copper–titanate

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