Aktuelle Entwicklungen in der optischen Datenspeicherung mit organischen Farbstoffen

Mustroph, Heinz; Stollenwerk, Manfred; Bressau, Volker

doi:10.1002/ange.200502820

Cited by 32 publications

(15 citation statements)

References 83 publications

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“…The commercial introduction of high power laser diodes in the middle of the 1980s opened the door to numerous new technical applications of cyanine dyes. Among their number were fluorescent probes for biomedical imaging, laser radiation absorbing dyes in CD‐R and DVD/R, and sensitisers in computer‐to‐plate (CtP) lithographic printing plates …”

Section: Introductionmentioning

confidence: 99%

Fine Structure in Electronic Spectra of Cyanine Dyes: Are Sub‐Bands Largely Determined by a Dominant Vibration or a Collection of Singly Excited Vibrations?

Mustroph

Towns²

2018

ChemPhysChem

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This work critically examines attempts to model the fine structure apparent in electronic spectra of cyanine dyes and their analogues. Numerous computational studies reported over the past decade attribute the origin of sub‐bands and their relative intensities to vibronic transitions in which the relevant electronic transition is coupled, irrespective of symmetry, with a collection of vibrations. It is contended that this type of approach is not supported by experimental evidence. An argument is reiterated for a more appropriate model that adheres closely to fundamental principles and fits the data. It stipulates that essentially just one symmetric vibration, carbon–carbon bond stretching of the cyanine polymethine chain, dominates the coupling and is responsible for the observed fine structure. Furthermore, it is pointed out that the intensities of the sub‐bands are readily explained by means of the Franck–Condon principle.

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Section: Introductionmentioning

confidence: 99%

Fine Structure in Electronic Spectra of Cyanine Dyes: Are Sub‐Bands Largely Determined by a Dominant Vibration or a Collection of Singly Excited Vibrations?

Mustroph

Towns²

2018

ChemPhysChem

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“…Organic pigments are of great importance to society. They are used in the production of photovoltaic materials, optical data storage devices, and also in the coloration of plastics and in the textile industry. With the current rapid population growth there is an ever‐increasing demand for pigments tailored for very specific applications .…”

Section: Introductionmentioning

confidence: 99%

Rationalization of the Color Properties of Fluorescein in the Solid State: A Combined Computational and Experimental Study

Arhangelskis

Eddleston

Reid

et al. 2016

Chemistry A European J

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Fluorescein is known to exist in three tautomeric forms defined as quinoid, zwitterionic, and lactoid. In the solid state, the quinoid and zwitterionic forms give rise to red and yellow materials, respectively. The lactoid form has not been crystallized pure, although its cocrystal and solvate forms exhibit colors ranging from yellow to green. An explanation for the observed colors of the crystals is found using a combination of UV/Vis spectroscopy and plane‐wave DFT calculations. The role of cocrystal coformers in modifying crystal color is also established. Several new crystal structures are determined using a combination of X‐ray and electron diffraction, solid‐state NMR spectroscopy, and crystal structure prediction (CSP). The protocol presented herein may be used to predict color properties of materials prior to their synthesis.

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“…Thus, the first laboratory‐synthesised porphyrin was the red‐coloured natural tetrapyrrole heme . Later, a multitude of artificial analogues were made, for example, as pigments, for the binding and activation of small molecules, for use as catalysts, sensors, redox systems, and as optical and other nanoscopic devices, as well as in materials sciences and medical applications . Many of these applications rely on the particular colours and optical properties of the porphyrins .…”

Section: Introductionmentioning

confidence: 99%

Panchromatic π‐Extended Porphyrins from Conjugation with Quinones

2016

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Typical porphyrins are coloured compounds due to their characteristic wavelength‐selective visible light absorptions. An exceptional “blackened” ZnII–porphyrin was recently obtained from fusing the β,β′‐positions of the porphyrin core with four quinone units. Here, studies with metal‐free and NiII‐containing analogues are reported. These quinone‐fused porphyrins were prepared from the corresponding β,β′‐tetrasulfolenoporphyrins via thermally generated porphyrindienes, which were trapped by [4+2] cycloaddition as benzoquinone cycloadducts, which were subsequently oxidised. By using this strategy, metal‐free and NiII‐containing porphyrins with one, two, three or four conjugated naphthoquinone moieties were prepared efficiently. The presence of the π‐conjugated naphthoquinone moieties changed the porphyrin chromophores profoundly, giving broadly absorbing “blackened” pigments. The influence of coordinated NiII ions, or of the absence of a metal ion in the modified porphyrin core, on their structural and spectroscopic properties was explored. Blackened quinone‐conjugated porphyrins might be pigments suitable for solar energy conversion. With their unique peripheral functional groups they are also a set of porphyrins “programmed” for further covalent extension. Thus, they are building blocks for the preparation of supra‐porphyrinoid assemblies that might be useful in optoelectronics and in the nanosciences.

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Aktuelle Entwicklungen in der optischen Datenspeicherung mit organischen Farbstoffen

Cited by 32 publications

References 83 publications

Fine Structure in Electronic Spectra of Cyanine Dyes: Are Sub‐Bands Largely Determined by a Dominant Vibration or a Collection of Singly Excited Vibrations?

Fine Structure in Electronic Spectra of Cyanine Dyes: Are Sub‐Bands Largely Determined by a Dominant Vibration or a Collection of Singly Excited Vibrations?

Rationalization of the Color Properties of Fluorescein in the Solid State: A Combined Computational and Experimental Study

Panchromatic π‐Extended Porphyrins from Conjugation with Quinones

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