Counteranion-dependent mechanochromism of a photoluminescent platinum(<scp>ii</scp>) complex with mixed terpyridine and thioglucose

Kitani, Naoki; Kuwamura, Naoto; Tsukuda, Toshiaki; Yoshinari, Nobuto; Konno, Takumi

doi:10.1039/c4cc06775d

Cited by 25 publications

(5 citation statements)

References 41 publications

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“…Previous research also conrms that coordination polymers have the ability to affect the emission strength and wavelength of organic materials through the judicious incorporation of different central metal ions. [48][49][50] Therefore, it gives us an impetus to investigate the solid-state photo-luminescent properties of complexes 1-5.…”

Section: Resultsmentioning

confidence: 99%

A series of two-dimensional microporous triazole-functionalized metal–organic frameworks with the new multi-dentate ligand 1-(4-aminobenzyl)-1,2,4-triazole: single-crystal-to-single-crystal transformation, structural diversity and luminescent sensing

et al. 2015

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Section: Resultsmentioning

confidence: 99%

A series of two-dimensional microporous triazole-functionalized metal–organic frameworks with the new multi-dentate ligand 1-(4-aminobenzyl)-1,2,4-triazole: single-crystal-to-single-crystal transformation, structural diversity and luminescent sensing

et al. 2015

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“…Usually, the stimuli-responsive luminescence of organic solid-state material shows remarkable changes in emission color in response to external stimuli (e.g., grinding, heating, and fuming). 8,9,[29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] However, simultaneous dual-responses of emission color and lifetime rarely occur between normal fluorescence and aggregate TADF. Herein, we report such a stimuli-responsive luminescence switching based on (E)-2-(benzo[d]thiazol-2-yl)-3-(pyren-1-yl)acrylonitrile (Py-BZTCN) molecule with pyrene (Py) as D and 2-(benzo[d]thiazol-2-yl)acrylonitrile (BZTCN) as A (Chart 1).…”

Section: Introductionmentioning

confidence: 99%

Thermally Activated Delayed Fluorescence of Aggregates Induced by Strong π–π Interactions and Reversible Dual-Responsive Luminescence Switching

Zhang

Zhou

et al. 2022

CCS Chem

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A reversible dual-responsive luminescent material was introduced by our group to show the simultaneous color and lifetime switching in response to external stimuli. Pristine crystalline powder of (E)-2-(benzo[d]thiazol-2-yl)-3-(pyren-1-yl)acrylonitrile (Py-BZTCN) shows the ordered π-π stacking with only near-monomer-normal orange-yellow fluorescence, but it exhibits red emission with thermally activated delayed fluorescence (TADF) after grinding, which can be reversibly recovered by heating or fuming treatment. Grinding disturbs the ordered π-π stacking of pristine powder, leading to the formation of small aggregates with compressed distance and increased overlap of π-π stacking between adjacent molecules. The cause of switching was verified by single-crystal X-ray diffraction experiments of two corresponding crystals. This strong π-π interaction effectively promotes the excited-state energy splitting and substantially decreases the singlet-triplet energy gap (ΔE ST ) of aggregates, resulting in the red TADF emission of aggregates through reverse intersystem crossing. This finding proposes a new route to realizing the TADF emission of aggregates through strong intermolecular interactions based on non-TADF monomer, thereby enabling a novel high-contrast dualresponsive luminescence switching.

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“…This process is usually reversible upon the application of solvent, vapor, or heat . Mechanochromism is seen in many organic molecules, polymers, , and, to a lesser extent, metal complexes. − The unground and ground forms tend to have different molecular arrangements and intermolecular interactions, leading to different optical properties. Mechanochromic transformations are often categorized into two groups: those with distinct phase transitions (i.e., single crystal to single crystal) ,,,,− and those involving conversion from a crystalline phase to an amorphous state. ,− ,,, …”

Section: Introductionmentioning

confidence: 99%

Luminescent Mechanochromism in a Gold(I)–Copper(I) N-Heterocyclic Carbene Complex

et al. 2015

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The silver(I) species [Ag(benzim(CH2py)2)2]PF6 (1) was prepared by refluxing the ligand precursor [H(benzim(CH2py)2)2]PF6 with Ag2O and aqueous sodium hydroxide in dichloromethane. Simple transmetalation of 1 with tetrahydrothiophenegold(I) chloride forms the gold(I) analogue [Au(benzim(CH2py)2)2]PF6 (2). The addition of 2 equiv of [Cu(NCCH3)4]PF6 to 2 in acetonitrile produces a blue-luminescent, trimetallic complex, [AuCu2(benzim(CH2py)2)2(NCCH3)4](PF6)3·2CH3CN (3·2CH3CN). When blue-luminescent 3·2CH3CN is exposed to air, the complex loses four acetonitrile molecules, and the emission of the desolvated complex (4) appears aquamarine. Crystallization of 4 from different solvents produces the complexes [AuCu2(benzim(CH2py)2)2](PF6)3 (5) and [AuCu2(benzim(CH2py)2)2(NCCH2CH3)2](PF6)3 (6). Upon grinding, both 3·2CH3CN and 4 exhibit mechanochromic transformations to a yellow-luminescent powder (ground-4). The reversible mechanochromic transformation of 3·2CH3CN to ground-4 is a crystalline-to-amorphous conversion accompanied by partial desolvation. The luminescent mechanochromism of 4 to ground-4 is an "amorphous-to-amorphous" process and does not require solvent loss. In addition to their mechanochromic properties, both 3·2CH3CN and 4 exhibit luminescent thermochromism through desolvation to form a weak luminescent powder (7).

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Counteranion-dependent mechanochromism of a photoluminescent platinum(ii) complex with mixed terpyridine and thioglucose

Cited by 25 publications

References 41 publications

A series of two-dimensional microporous triazole-functionalized metal–organic frameworks with the new multi-dentate ligand 1-(4-aminobenzyl)-1,2,4-triazole: single-crystal-to-single-crystal transformation, structural diversity and luminescent sensing

A series of two-dimensional microporous triazole-functionalized metal–organic frameworks with the new multi-dentate ligand 1-(4-aminobenzyl)-1,2,4-triazole: single-crystal-to-single-crystal transformation, structural diversity and luminescent sensing

Thermally Activated Delayed Fluorescence of Aggregates Induced by Strong π–π Interactions and Reversible Dual-Responsive Luminescence Switching

Luminescent Mechanochromism in a Gold(I)–Copper(I) N-Heterocyclic Carbene Complex

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