Search results for: K. Haupt

Items from 1 to 20 out of 27 results

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Cover Picture: Densely Packed Hydrophobic Clustering: Encapsulated Valerates Form a High‐Temperature‐Stable {Mo₁₃₂} Capsule System (Angew. Chem. Int. Ed. 23/2016)

Somenath Garai, Hartmut Bögge, Alice Merca, Olga A. Petina, more

Angewandte Chemie International Edition > 55 > 23 > 6563 - 6563

Porous spherical nanocontainers … … densely packed with valerates (pictured as juggling balls) are very stable and indicate the unique possibility of hydrophobic clustering inside a cavity, as reported by A. Müller and co‐workers in their Communication on page 6634 ff. The clusters remain intact at temperatures of up to nearly the boiling point of water (© jokatoons/bildkistl, Fotolia.com).

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Densely Packed Hydrophobic Clustering: Encapsulated Valerates Form a High‐Temperature‐Stable {Mo₁₃₂} Capsule System

Somenath Garai, Hartmut Bögge, Alice Merca, Olga A. Petina, more

Angewandte Chemie International Edition > 55 > 23 > 6634 - 6637

Porous molecular nanocontainers of {Mo₁₃₂}‐type Keplerates offer unique opportunities to study a wide variety of relevant phenomena. An impressive example is provided by the highly reactive {Mo₁₃₂‐CO₃} capsule, the reaction of which with valeric acid results in the very easy release of carbon dioxide and the uptake of 24 valerate ions/ligands that are integrated as a densely packed aggregate, thus...

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Titelbild: Densely Packed Hydrophobic Clustering: Encapsulated Valerates Form a High‐Temperature‐Stable {Mo₁₃₂} Capsule System (Angew. Chem. 23/2016)

Somenath Garai, Hartmut Bögge, Alice Merca, Olga A. Petina, more

Angewandte Chemie > 128 > 23 > 6673 - 6673

Poröse sphärische Nanocontainer … …, die eine dichte Packung von Valeraten einschließen (dargestellt als Bälle), sind äußerst stabil und demonstrieren die Möglichkeit hydrophober Clusterbildung im Inneren einer Kavität. Wie A. Müller et al. in der Zuschrift auf S. 6746 ff. beschreiben, bleiben die Cluster selbst bei Temperaturen nahe dem Siedepunkt von Wasser intakt (© jokatoons/bildkistl, Fotolia...

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Densely Packed Hydrophobic Clustering: Encapsulated Valerates Form a High‐Temperature‐Stable {Mo₁₃₂} Capsule System

Somenath Garai, Hartmut Bögge, Alice Merca, Olga A. Petina, more

Angewandte Chemie > 128 > 23 > 6746 - 6749

chapter

An All-Optical Synchrotron Light Source

H. Schwoerer, H. P. Schlenvoigt, K. Haupt, A. Debus, more

Springer Series in Chemical Physics > Ultrafast Phenomena XVI > Novel Pulsed Sources: oscillators, amplifiers, nonlinear mixing > 813-815

We report on the generation of synchrotron radiation from laser accelerated relativistic electrons propagating through an undulator. We indicate that this provides exciting novel opportunities in ultrafast spectroscopy.

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Direct Measurement of VCSEL Transverse Mode Correlation and $k_{\mathrm {mpn}}$

Justin Lavrencik, Sriharsha Kota Pavan, David K. Haupt, Stephen E. Ralph

IEEE Photonics Technology Letters > 2015 > 27 > 19 > 2031 - 2034

The correlation properties of vertical-cavity surface-emitting laser (VCSEL) transverse modes determine the noise impairments of VCSEL-based high-speed links. The cross-correlation statistics between VCSEL mode pairs and the autocorrelation statistics for each VCSEL mode are directly measured using real-time 40GSs synchronous observations of spatially separated modes. Anticorrelation was found to...

chapter

Direct measurement of transverse mode correlation and MPN using 900nm VCSELs

Justin Lavrencik, Sriharsha Kota Pavan, David K. Haupt, Stephen E. Ralph

2015 Optical Fiber Communications Conference and Exhibition (OFC) > 1 - 3

2015 Optical Fiber Communications Conference and Exhibition (OFC)

Cross-correlations between VCSEL transverse modes are measured using 40GSps synchronous observations of spatially separated modes. Positive correlation and anti-correlation behaviors are observed as well as low, distinct k_mpn, contrary to assumptions of the IEEE model.

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A Unique Fluoride Nanocontainer: Porous Molecular Capsules Can Accommodate an Unusually High Number of “Rather Labile” Fluoride Anions

Somenath Garai, Mirta Rubčić, Hartmut Bögge, Erhard T. K. Haupt, more

Angewandte Chemie > 127 > 20 > 5977 - 5980

The present work refers to the challenging issue of fluoride anion recognition/binding in water by taking advantage of the unique possibilities offered by the porous molecular nanocontainers of the {Mo₁₃₂} Keplerate type allowing the study of a variety of new phenomena. Reaction of the highly reactive carbonate‐type capsule with aqueous HF results in the release of carbon dioxide and integration of...

article

A Unique Fluoride Nanocontainer: Porous Molecular Capsules Can Accommodate an Unusually High Number of “Rather Labile” Fluoride Anions

Somenath Garai, Mirta Rubčić, Hartmut Bögge, Erhard T. K. Haupt, more

Angewandte Chemie International Edition > 54 > 20 > 5879 - 5882

article

An Unstable Paramagnetic Isopolyoxomolybdate Intermediate Non‐Homogeneously Reduced at Different Sites and Trapped in a Host Based on Chemical Adaptability

Alice Merca, Somenath Garai, Hartmut Bögge, Erhard T. K. Haupt, more

Angewandte Chemie > 125 > 45 > 11981 - 11985

Stabilisiert: Ein Metalloxid‐Wirt mit einem eingeschlossenen instabilen {Mo₃₆}‐artigen Polyoxomolybdat‐Gast weist reduzierte diamagnetische Bausteine sowie paramagnetische Zentren auf (beide Arten mit anderen Farben als dem Schwarzblau der Mo‐Zentren gekennzeichnet). Der Gast in solchen Systemen wird unter anderem durch ein Netzwerk aus Wasserstoffbrücken zwischen dem Kern und der Schale stabilisiert.

article

An Unstable Paramagnetic Isopolyoxomolybdate Intermediate Non‐Homogeneously Reduced at Different Sites and Trapped in a Host Based on Chemical Adaptability

Alice Merca, Somenath Garai, Hartmut Bögge, Erhard T. K. Haupt, more

Angewandte Chemie International Edition > 52 > 45 > 11765 - 11769

Stabilize me: A metal oxide host with a trapped unstable {Mo₃₆}‐type polyoxomolybdate guest exhibits independent reduced diamagnetic building blocks and paramagnetic centers (both types with colors other than the dark blue of the Mo centers). The guest in such systems is stabilized especially by a hydrogen‐bond network between the core and the shell.

article

A simple approach to prepare molecularly imprinted polymers from nylon‐6

E. V. Dmitrienko, R. D. Bulushev, K. Haupt, S. S. Kosolobov, more

Journal of Molecular Recognition > 26 > 8 > 368 - 375

A convenient and simple approach for the preparation of molecularly imprinted polymers (MIPs) based on polyamide (nylon‐6) was developed. The polymer matrix formation occurred during the transition of nylon from dissolved to solid state in the presence of template molecules in the initial solution. 2,2,2‐Trifluoroethanol (TFE) was chosen as a main solvent for the polyamide. It provides a high solubility...

article

Cover Picture: Chemical Adaptability: The Integration of Different Kinds of Matter into Giant Molecular Metal Oxides (Chem. Eur. J. 51/2012)

Achim Müller, Alice Merca, Ahmed Jasim M. Al‐Karawi, Somenath Garai, more

Chemistry – A European Journal > 18 > 51 > 16237 - 16237

The term adaptability is often used in biology on organism and molecular level, but rather seldom in chemistry. In their Full Paper on page 16310 ff., A. Müller, E. T. K. Haupt et al. refer to a new phenomenon that they call “chemical adaptability”. Wheel‐shaped molecular metal oxides can integrate different kinds of matter without changing their shapes and even cations and anions at the same positions...

article

Chemical Adaptability: The Integration of Different Kinds of Matter into Giant Molecular Metal Oxides

Achim Müller, Alice Merca, Ahmed Jasim M. Al‐Karawi, Somenath Garai, more

Chemistry – A European Journal > 18 > 51 > 16310 - 16318

Unique properties of the two giant wheel‐shaped molybdenum‐oxides of the type {Mo₁₅₄}≡[{Mo₂}{Mo₈}{Mo₁}]₁₄ (1) and {Mo₁₇₆}≡[{Mo₂}{Mo₈}{Mo₁}]₁₆ (2) that have the same building blocks either 14 or 16 times, respectively, are considered and show a “chemical adaptability” as a new phenomenon regarding the integration of a large number of appropriate cations and anions, for example, in form of the large...

article

Picking up 30 CO₂ Molecules by a Porous Metal Oxide Capsule Based on the Same Number of Receptors

Somenath Garai, Erhard T. K. Haupt, Hartmut Bögge, Alice Merca, more

Angewandte Chemie > 124 > 42 > 10680 - 10683

30 Rezeptoren in Warteposition: In einer porösen (Fünfeck)₁₂(Linker)₃₀‐Molybdänoxid‐Kapsel (siehe Bild) können die 30 positiv geladenen Linker (fünf unbesetzte zur Illustration grün gezeigt, die übrigen tragen CO₃²⁻‐Liganden) als Rezeptoren für neutrale und negativ geladene Liganden wirken. Beim Einblasen von CO₂ in Lösungen der acetathaltigen Kapseln wird CO₂ in Form von 30 koordinierten CO₃²⁻‐Liganden...

article

Picking up 30 CO₂ Molecules by a Porous Metal Oxide Capsule Based on the Same Number of Receptors

Somenath Garai, Erhard T. K. Haupt, Hartmut Bögge, Alice Merca, more

Angewandte Chemie International Edition > 51 > 42 > 10528 - 10531

30 receptors in waiting position: In the porous (pentagon)₁₂(linker)₃₀‐type molybdenum oxide capsule (see picture), the 30 positively charged linkers (five unsaturated shown for illustration in green, the others contain CO₃²⁻ ligands) can act as receptors for neutral and negatively charged ligands. Bubbling CO₂ into the solution containing the acetate‐type capsules leads to the upload of CO₂ based...

article

Photo-triggered pulsed cavity compressor for bright electron bunches in ultrafast electron diffraction

G. H. Kassier, N. Erasmus, K. Haupt, I. Boshoff, more

Applied Physics B > 2012 > 109 > 2 > 249-257

Temporally resolved observation of microscopic structural dynamics of solids with ultrafast electron diffraction (UED) requires extremely short pulsed, highly charged, monoenergetic electron beams with sufficient transverse coherence length of several unit cells of the investigated samples. However, Coulomb repulsion defeats these parameters in free propagation of an electron pulse initially bright...

article

Hydrophobic Interactions and Clustering in a Porous Capsule: Option to Remove Hydrophobic Materials from Water

Christian Schäffer, Ana Maria Todea, Hartmut Bögge, Olga A. Petina, more

Chemistry – A European Journal > 17 > 35 > 9634 - 9639

The investigation of hydrophobic interactions under confined conditions is of tremendous interdisciplinary interest. It is shown that based on porous capsules of the type {(pentagon)}₁₂{(linker)}₃₀ ≡ {(Mo)Mo₅}₁₂{Mo₂(ligand)}₃₀, which exhibit different hydrophobic interiors—achieved by coordinating related ligands to the internal sites of the 30 {Mo₂} type linkers—there is the option to study systematically...

article

Guests on Different Internal Capsule Sites Exchange with Each Other and with the Outside

Olga Petina, Dieter Rehder, Erhard T. K. Haupt, Alina Grego, more

Angewandte Chemie > 123 > 2 > 430 - 434

Rein und raus: Die Kompartimentierung in einer porösen Polyoxometallatkapsel (siehe Struktur, rote und blaue Polyeder) ermöglicht es Acetationen (grün/rot oder orange/rot), die an unterschiedliche innere Positionen koordiniert sind, nicht nur untereinander auszutauschen (gelber Doppelpfeil), sondern auch mit den Ionen in der umgebenden wässrigen Lösung.

article

Guests on Different Internal Capsule Sites Exchange with Each Other and with the Outside

Olga Petina, Dieter Rehder, Erhard T. K. Haupt, Alina Grego, more

Angewandte Chemie International Edition > 50 > 2 > 410 - 414

In and out: Compartmentalization in a porous polyoxometalate capsule (see structure, red and blue polyhedra) allows acetate ions (green/red or orange/red), coordinated to different internal sites, to exchange not only with each other (yellow double arrow) but also with those outside in bulk aqueous solution.

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Search results for: K. Haupt

Cover Picture: Densely Packed Hydrophobic Clustering: Encapsulated Valerates Form a High‐Temperature‐Stable {Mo₁₃₂} Capsule System (Angew. Chem. Int. Ed. 23/2016)

Densely Packed Hydrophobic Clustering: Encapsulated Valerates Form a High‐Temperature‐Stable {Mo₁₃₂} Capsule System

Titelbild: Densely Packed Hydrophobic Clustering: Encapsulated Valerates Form a High‐Temperature‐Stable {Mo₁₃₂} Capsule System (Angew. Chem. 23/2016)

Densely Packed Hydrophobic Clustering: Encapsulated Valerates Form a High‐Temperature‐Stable {Mo₁₃₂} Capsule System

An All-Optical Synchrotron Light Source

Direct Measurement of VCSEL Transverse Mode Correlation and $k_{\mathrm {mpn}}$

Direct measurement of transverse mode correlation and MPN using 900nm VCSELs

A Unique Fluoride Nanocontainer: Porous Molecular Capsules Can Accommodate an Unusually High Number of “Rather Labile” Fluoride Anions

A Unique Fluoride Nanocontainer: Porous Molecular Capsules Can Accommodate an Unusually High Number of “Rather Labile” Fluoride Anions

An Unstable Paramagnetic Isopolyoxomolybdate Intermediate Non‐Homogeneously Reduced at Different Sites and Trapped in a Host Based on Chemical Adaptability

An Unstable Paramagnetic Isopolyoxomolybdate Intermediate Non‐Homogeneously Reduced at Different Sites and Trapped in a Host Based on Chemical Adaptability

A simple approach to prepare molecularly imprinted polymers from nylon‐6

Cover Picture: Chemical Adaptability: The Integration of Different Kinds of Matter into Giant Molecular Metal Oxides (Chem. Eur. J. 51/2012)

Chemical Adaptability: The Integration of Different Kinds of Matter into Giant Molecular Metal Oxides

Picking up 30 CO₂ Molecules by a Porous Metal Oxide Capsule Based on the Same Number of Receptors

Picking up 30 CO₂ Molecules by a Porous Metal Oxide Capsule Based on the Same Number of Receptors

Photo-triggered pulsed cavity compressor for bright electron bunches in ultrafast electron diffraction

Hydrophobic Interactions and Clustering in a Porous Capsule: Option to Remove Hydrophobic Materials from Water

Guests on Different Internal Capsule Sites Exchange with Each Other and with the Outside

Guests on Different Internal Capsule Sites Exchange with Each Other and with the Outside

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