Harald Böck
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View article: Delayed Fluorescence and Room Temperature Phosphorescence from a Liquid Arene
Delayed Fluorescence and Room Temperature Phosphorescence from a Liquid Arene Open
Delayed emission (DF) of fluorescence is generally observed either in solution or in the crystalline state. In the latter, well‐defined intermolecular interactions may play a significant role in defining the emission characteristics. Here,…
View article: Trinaphthyl-triazines: towards persistent room temperature columnar mesomorphic matrices
Trinaphthyl-triazines: towards persistent room temperature columnar mesomorphic matrices Open
Trinaphthyl-triazines exhibiting persistent room temperature hexagonal columnar mesomorphism with spontaneous homeotropic alignment, large S 0 –S 1 /T 1 energy gaps, and aggregate-based fluorescence.
View article: Hierarchical chirality observed from chiral supramolecular assembling of racemic and enantiopure helicene derivatives on silica nanohelix surfaces
Hierarchical chirality observed from chiral supramolecular assembling of racemic and enantiopure helicene derivatives on silica nanohelix surfaces Open
The combination of silica nanohelices and helicenes reveals different orientations of helicenes in helical supramolecular assemblies formed on silica surfaces, and the chiroptical signals were induced by helicene adsorption and helical org…
View article: Highly Luminescent Aceno[6]helicenones by Intramolecular Radical Cyclization
Highly Luminescent Aceno[6]helicenones by Intramolecular Radical Cyclization Open
Helicenes and helicenoid structures are promising candidates for future applications exploiting circularly polarized light. Ideal candidates should possess near‐quantitative photoluminescence quantum yield, a high luminescence dissymmetry …
View article: Nanoscale View of Alignment and Domain Growth in a Hexagonal Columnar Liquid Crystal
Nanoscale View of Alignment and Domain Growth in a Hexagonal Columnar Liquid Crystal Open
Highly ordered liquid crystalline (LC) phases have important potential for organic electronics. We studied the molecular alignment and domain structure in a columnar LC thin film with nanometer resolution during in situ heating using four-…
View article: Aromaticity in Semi‐Condensed Figure‐Eight Molecules
Aromaticity in Semi‐Condensed Figure‐Eight Molecules Open
Electron delocalization and aromaticity was comparatively evaluated in recently synthesized figure‐eight molecules made of two condensed U‐shaped polycyclic aromatic hydrocarbon moieties connected either by two single bonds or by two para‐…
View article: Helicene Aromaticity Deviates from the Clar Rule—On the Electronic Dissimilarity of Large Isomeric Fibonacenes
Helicene Aromaticity Deviates from the Clar Rule—On the Electronic Dissimilarity of Large Isomeric Fibonacenes Open
This combined experimental and theoretical study illustrates the profound consequences of non‐planarity on the electronic properties of polycyclic arenes. Three isomeric [10]fibonacene tetraesters were synthesized through a robust and regi…
View article: Perylene-Based Columnar Liquid Crystal: Reveling Unipolar Resistive Switching for Nonvolatile Memory Devices
Perylene-Based Columnar Liquid Crystal: Reveling Unipolar Resistive Switching for Nonvolatile Memory Devices Open
Perylene-based columnar liquid crystal (LC) devices exhibit unipolar resistive switching (RS), clearly identified on cyclic J-V curve hysteresis, stable for several cycles. Trap-controlled SCLC conduction is responsible for the charge tran…
View article: Influence of the Deposition Rate on the Alignment and Performance of Perylene-3,4,9,10-tetracarboxylic Tetraethyl Ester in an Organic Light Emitting Diode
Influence of the Deposition Rate on the Alignment and Performance of Perylene-3,4,9,10-tetracarboxylic Tetraethyl Ester in an Organic Light Emitting Diode Open
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View article: Coronenes with push–pull geometries from macrocycle-forming Perkin condensations
Coronenes with push–pull geometries from macrocycle-forming Perkin condensations Open
The condensation of bifunctional phenanthrene with bifunctional benzene by Perkin reaction gives 1+1 conjugated macrocycles that can be photoplanarised to substituted coronenes.
View article: Carbonyl mediated fluorescence in aceno[ <i>n</i> ]helicenones and fluoreno[ <i>n</i> ]helicenes
Carbonyl mediated fluorescence in aceno[ <i>n</i> ]helicenones and fluoreno[ <i>n</i> ]helicenes Open
Carbo[ n ]helicenes are poor emitters with the emission peak in purple or blue region. Attaching an aryl-carbonyl group to the helical skeleton shifts the absorption and emission to the visible region and improves the fluorescence quantum …
View article: Vapor-to-glass preparation of biaxially aligned organic semiconductors
Vapor-to-glass preparation of biaxially aligned organic semiconductors Open
Physical vapor deposition (PVD) provides a route to prepare highly stable and anisotropic organic glasses that are utilized in multi-layer structures such as organic light-emitting devices. While previous work has demonstrated that anisotr…
View article: Charge carrier transport in perylene-based and pyrene-based columnar liquid crystals
Charge carrier transport in perylene-based and pyrene-based columnar liquid crystals Open
Electron and hole transport characteristics were evaluated for perylene-based and pyrene-based compounds using electron-only and hole-only devices. The perylene presented a columnar hexagonal liquid crystal phase at room temperature with s…
View article: Dissymmetric Triaryltriazines: Small Mass Columnar Glasses
Dissymmetric Triaryltriazines: Small Mass Columnar Glasses Open
Columnar liquid crystals with very small molecular masses that form anisotropic glasses well above room temperature are obtained by mixed dissymmetric substitution of sym ‐triazine with ester‐bearing phenyl and phenanthryl or tetraheliceny…
View article: CCDC 2215761: Experimental Crystal Structure Determination
CCDC 2215761: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: Engineering the glass structure of a discotic liquid crystal by multiple kinetic arrests
Engineering the glass structure of a discotic liquid crystal by multiple kinetic arrests Open
X-ray scattering has been used to characterize the columnar packing and the π stacking in a glass-forming discotic liquid crystal. In the equilibrium liquid state, the intensities of the scattering peaks for π stacking and columnar packing…
View article: A Triply [5]Helicene‐Bridged (1,3,5)Cyclophane
A Triply [5]Helicene‐Bridged (1,3,5)Cyclophane Open
A rigid propeller‐shaped conjugated triple macrocycle consisting of two nearly perfectly stacked benzene rings and three linking [5]helicene moieties has been synthesized using a glyoxylic Perkin approach. Analysis of the electron delocali…
View article: Data for paper "Vapor-to-glass preparation of biaxially aligned organic semiconductors"
Data for paper "Vapor-to-glass preparation of biaxially aligned organic semiconductors" Open
Physical vapor deposition (PVD) provides a route to prepare anisotropic organic glasses which are utilized in multi-layer structures such as organic light emitting devices (OLEDs). While previous work has demonstrated that anisotropic glas…
View article: Using 4D STEM to probe mesoscale order in molecular glass films prepared by physical vapor deposition
Using 4D STEM to probe mesoscale order in molecular glass films prepared by physical vapor deposition Open
Physical vapor deposition can be used to prepare highly stable organic glass systems where the molecules show orientational and translational ordering at the nanoscale. We have used low-dose four-dimensional scanning transmission electron …
View article: Using 4D STEM to Probe Mesoscale Order in Molecular Glass Films Prepared by Physical Vapor Deposition
Using 4D STEM to Probe Mesoscale Order in Molecular Glass Films Prepared by Physical Vapor Deposition Open
Physical vapor deposition can be used to prepare highly stable organic glass systems where the molecules show orientational and translational ordering at the nanoscale. We have used low-dose four-dimensional scanning transmission electron …
View article: Columnar Liquid Crystalline Glasses by Combining Configurational Flexibility with Moderate Deviation from Planarity: Extended Triaryltriazines
Columnar Liquid Crystalline Glasses by Combining Configurational Flexibility with Moderate Deviation from Planarity: Extended Triaryltriazines Open
Triply phenanthryl‐ and tetrahelicenyl‐substituted triazine‐hexaalkyl esters with short alkyl chains show glass transitions conveniently above room temperature within the hexagonal columnar liquid crystalline state, resulting in a solid co…
View article: Room Temperature Phosphorescence in Solution from Thiophene‐Bridged Triply Donor‐Substituted Tristriazolotriazines
Room Temperature Phosphorescence in Solution from Thiophene‐Bridged Triply Donor‐Substituted Tristriazolotriazines Open
Most organic room‐temperature phosphorescence (RTP) emitters do not show their RTP in solution. Here, we incorporated sulfur‐containing thiophene bridges between the donor and acceptor moieties in D 3 A‐type tristriazolotriazines (TTTs). T…
View article: CCDC 2191273: Experimental Crystal Structure Determination
CCDC 2191273: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: The effect of substituents and molecular aggregation on the room temperature phosphorescence of a twisted π-system
The effect of substituents and molecular aggregation on the room temperature phosphorescence of a twisted π-system Open
Room temperature phosphorescence of an intrinsically apolar twisted π-system is modulated by polar substituents. Persistent phosphorescence is visible by eye in poder, induced by molecular aggregation.
View article: 4D STEM with an Ultrafast Camera Reveals Mesoscale Structure in Anisotropic Molecular Glass Thin Films
4D STEM with an Ultrafast Camera Reveals Mesoscale Structure in Anisotropic Molecular Glass Thin Films Open
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View article: Delayed Fluorescence by Triplet–Triplet Annihilation from Columnar Liquid Crystal Films
Delayed Fluorescence by Triplet–Triplet Annihilation from Columnar Liquid Crystal Films Open
Delayed fluorescence (DF) by triplet-triplet annihilation (TTA) is observed in solutions of a benzoperylene-imidoester mesogen that shows a hexagonal columnar mesophase at room temperature in the neat state. A similar benzoperylene-imide w…