Fluorescent H‐Aggregates of Merocyanine Dyes

Rösch, Ulrich; Yao, Sheng; Wortmann, Rüdiger; Würthner, Frank

doi:10.1002/anie.200602286

Cited by 372 publications

(252 citation statements)

References 30 publications

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“…These two cases are easily recognized by absorption spectra. Compared to monomers, in H-aggregates they are shifted hypsochromically (to shorter wavelengths), but the correspondent fluorescence spectra (which can be very low in intensity) are shifted to longer wavelengths [28]. Such division into H-and J-aggregates is a simplification, and some intermediate cases may be expected, so that H-and J-bands or several J-bands can be observed simultaneously.…”

Section: Formation and Optical Properties Of J-aggregatesmentioning

confidence: 99%

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Fluorescent J-aggregates of cyanine dyes: basic research and applications review

Bricks

Slominskii

Panas

et al. 2017

Methods Appl. Fluoresc.

340

299

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J-aggregates are fascinating fluorescent nanomaterials formed by highly ordered assembly of organic dyes with the spectroscopic properties dramatically different from that of single or disorderly assembled dye molecules. They demonstrate very narrow red-shifted absorption and emission bands, strongly increased absorbance together with the decrease of radiative lifetime, highly polarized emission and other valuable features. The mechanisms of their electronic transitions are understood by formation of delocalized excitons already on the level of several coupled monomers. Cyanine dyes are unique in forming J-aggregates over the broad spectral range, from blue to near-IR. With the aim to inspire further developments, this review is focused on the optical characteristics of J-aggregates in connection with the dye structures and on their diverse already realized and emerging applications.

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Section: Formation and Optical Properties Of J-aggregatesmentioning

confidence: 99%

“…In contrast, in some conditions the dyes can assemble into quite different H-aggregates (H denotes hypsochromic) that are formed by side-by-side sandwich association with crossed dipoles [28]. These two cases are easily recognized by absorption spectra.…”

Section: Formation and Optical Properties Of J-aggregatesmentioning

confidence: 99%

Fluorescent J-aggregates of cyanine dyes: basic research and applications review

Bricks

Slominskii

Panas

et al. 2017

Methods Appl. Fluoresc.

340

299

View full text Add to dashboard Cite

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“…In general, H-type aggregation causes strong fluorescence quenching, as is typically observed for dipolar merocyanine dyes 30,31 . If the largest Stokes shift (11,681 cm -1 ) among the three phases is taken into consideration, the fluorescence from 1Y could arise from an imperfect H-type stacking with a rotational displacement around the stacking axis, thereby allowing the radiative decay to originate from the lower-lying exciton state 32 .…”

Section: Molecular Designmentioning

confidence: 99%

Design amphiphilic dipolar π-systems for stimuli-responsive luminescent materials using metastable states

et al. 2014

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p-Conjugated compounds that exhibit tunable luminescence in the solid state under external mechanical stimuli have potential applications in sensors and imaging devices. However, no rational designs have been proposed that impart these mechano-responsive luminescent properties to p-conjugated compounds. Here we demonstrate a strategy for mechanoresponsive luminescent materials by imparting amphiphilic and dipolar characteristics to a luminescent p-conjugated system. The oligo(p-phenylenevinylene) luminophore with a didodecylamino group at one end and a tri(ethylene glycol) ester group at the other end yields segregated solid structures by separately aggregating its hydrophobic and hydrophilic moieties. The segregated structures force the molecules to align in the same direction, thereby generating a conflict between the side-chain aggregation and dipolar stabilization of the p-system. Consequently, these metastable solid structures can be transformed through mechanical stimulation to a more stable structure, from a p-p stacked aggregate to a liquid crystal and further to a crystalline phase with variable luminescence.

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“…For example, dimerization brought about 20-fold deceleration of the deactivation from the singlet-excited state for oxacarbocyanines [21], whereas almost 9-fold slowing down was found for a merocyanine dye [22]. The coralyne monomer and dimer had 9.7 and 40.7 ns fluorescence decay times, respectively [18].…”

Section: Effect Of Dimerization On the Fluorescence Characteristicsmentioning

confidence: 98%

The origin of the dual fluorescence of protonated ellipticine in water

Miskolczy

Biczók

Jablonkai

2016

Chemical Physics Letters

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Absorption and fluorescence spectroscopic measurements, as well as isothermal calorimetric titrations showed that the biexponential decay kinetics of protonated ellipticine (EH + )fluorescence in water originates from dimerization. Due to the high equilibrium constant for the association of two EH + and the intense fluorescence of the dimer, deviation from the exponential emission intensity decay commences below micromolar concentrations. Dimerization must be taken into account when EH + concentration is determined by spectrophotometry, and when EH + binding to substrates are studied. The molar absorption coefficients of the monomer and dimer were determined.

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Fluorescent H‐Aggregates of Merocyanine Dyes

Cited by 372 publications

References 30 publications

Fluorescent J-aggregates of cyanine dyes: basic research and applications review

Fluorescent J-aggregates of cyanine dyes: basic research and applications review

Design amphiphilic dipolar π-systems for stimuli-responsive luminescent materials using metastable states

The origin of the dual fluorescence of protonated ellipticine in water

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