Tina Löschner

Abstract Spirocyclic silicon alkoxides were synthesized by reaction of Si(OMe) 4 with derivatives of salicylic alcohol and studied by in situ differential scanning calorimetry with regard to twin polymerization (TP). Both, thermally induced and proton‐assisted TP gave nanostructured hybrid materials composed of a phenolic resin and silica. Carbonization and subsequent treatment with HF (aq) resulted in microporous carbon, whereas oxidation in air provided mesoporous silica. DFT calculations were performed to obtain a more detailed insight into the first reaction steps of proton‐assisted TP and to support the hypothesis of a reactivity scale based on steric and electronic features of the silicon‐containing precursors (twin monomers). The calculated reaction barriers for the initial reaction steps of proton‐assisted TP are qualitatively in accordance with the Hammett constants of the substituents at the salicylate moiety. This result offers a simple method to predict the reactivity for twin monomers.

Reactivity

Moiety

Carbon fibers

10.1002/cplu.201402029

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Citations (30)

Ein modularer Ansatz zur gezielten Herstellung nanostrukturierter Hybridmaterialien: die simultane Zwillingspolymerisation

Angewandte Chemie (2012)

Tina Löschner Alexander Mehner Silke Grund Andreas Seifert Andreas Pohlers

Ein Paradoxon: Homopolymere entstehen bei der Copolymerisation zweier Zwillingsmonomere. Mit der neuen Methode der simultanen Zwillingspolymerisation können gezielt komplexe Hybridmaterialien synthetisiert werden (siehe Schema), wobei je nach Kombination der Zwillingsmonomere nanostrukturierte Hybridmaterialien unterschiedlicher Zusammensetzung und Eigenschaften entstehen. Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

Schema (genetic algorithms)

10.1002/ange.201108011

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Citations (26)

CCDC 983734: Experimental Crystal Structure Determination

The Cambridge Structural Database (2014)

Philipp Kitschke Alexander A. Auer Tina Löschner Andreas Seifert Stefan Spange

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 from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Crystal (programming language)

10.5517/cc120nc3

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A Modular Approach for the Synthesis of Nanostructured Hybrid Materials with Tailored Properties: The Simultaneous Twin Polymerization

Angewandte Chemie International Edition (2012)

Tina Löschner Alexander Mehner Silke Grund Andreas Seifert Andreas Pohlers

A third twin: Homopolymers are formed by the copolymerization of two twin monomers. Using the new method of simultaneous twin polymerization, complex hybrid materials can be synthesized in a targeted manner (see scheme), in which, depending upon the combination of twin monomers used, nanostructured hybrid materials with different compositions and properties can be obtained. Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

10.1002/anie.201108011

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Citations (35)

Thermally Induced Twin Polymerization of 4H‐1,3,2‐Benzodioxasilines

Chemistry - A European Journal (2014)

Patrick Kempe Tina Löschner Alexander A. Auer Andreas Seifert Gerhard Cox

Abstract The twin monomer 2,2′‐spirobi[4 H ‐1,3,2‐benzodioxasiline] ( 1 ) can be polymerized to nanostructured SiO 2 /phenolic‐resin composite material by thermally induced twin polymerization. Thermally induced twin polymerization represents a way to produce nanocomposites simply by thermal induction of twin monomers. Besides 1 , the thermal reaction of several related salicylic (2‐oxybenzylic) silicon molecules has been investigated. The thermal cleavage of the molecules is studied by using several trapping reagents (e.g., vinyl compounds). A significant occurrence of quinone methide adducts indicates that the thermal mechanism proceeds not only by a ring opening at the oxymethylene position, but also with the ortho ‐quinone methide as a central or alternative intermediate. This is supported by product analyses of thermally initialized reactions of 1 and its substituted analogues as well as by quantum chemical calculations.

Quinone methide

Thermal Stability

10.1002/chem.201400038

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Citations (31)

CCDC 983732: Experimental Crystal Structure Determination

The Cambridge Structural Database (2014)

Philipp Kitschke Alexander A. Auer Tina Löschner Andreas Seifert Stefan Spange

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 from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Crystal (programming language)

10.5517/cc120n91

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CCDC 983735: Experimental Crystal Structure Determination

The Cambridge Structural Database (2014)

Philipp Kitschke Alexander A. Auer Tina Löschner Andreas Seifert Stefan Spange

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 from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/cc120nd4

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CCDC 983730: Experimental Crystal Structure Determination

The Cambridge Structural Database (2014)

Philipp Kitschke Alexander A. Auer Tina Löschner Andreas Seifert Stefan Spange

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 from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/cc120n7z

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CCDC 983731: Experimental Crystal Structure Determination

The Cambridge Structural Database (2014)

Philipp Kitschke Alexander A. Auer Tina Löschner Andreas Seifert Stefan Spange

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 from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Crystal (programming language)

10.5517/cc120n80

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Citations (0)

CCDC 983733: Experimental Crystal Structure Determination

The Cambridge Structural Database (2014)

Philipp Kitschke Alexander A. Auer Tina Löschner Andreas Seifert Stefan Spange

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 from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/cc120nb2

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Citations (0)

Tina Löschner

Papers

Citation

H-Index

i-10 index

Papers

Citation

H-Index

i-10 index