Author: Jana Marie Stahlhofen

0000000000328747

AUTHOR

Jana Marie Stahlhofen

showing 8 related works from this author

One-Pot Synthesis to Quinone-Based Diaza[3.3]cyclophanes

2017

A simple one-pot synthesis to [3.3]cyclophanes that involves quinone moieties was found. The protocol tolerates a variety of amines that include aliphatic and aromatic structures with different functional groups, such as hydroxy groups, amides, and terminal double and triple bonds. The straightforward synthesis can be performed by a twofold N-alkylation reaction with 2,5-bis(bromomethyl)-3,6-dimethyl-1,4-benzoquinone (1). Neither anhydrous nor inert conditions are required. Various amines can be employed without any activating groups, several functionalities at end groups are tolerated, and the cyclophanes generated can be easily modified or embedded into larger molecular architectures. The…

010405 organic chemistryChemistryOrganic ChemistryOne-pot synthesisfood and beveragesAlkylation010402 general chemistryTriple bond01 natural sciences0104 chemical sciencesQuinonechemistry.chemical_compoundAnhydrousOrganic chemistryAmine gas treatingPhysical and Theoretical ChemistryCyclophaneEuropean Journal of Organic Chemistry

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Fine tuning of thermoelectric performance in phase-separated half-Heusler compounds

2015

Two successful recipes to enhance the thermoelectric performance, namely carrier concentration optimization and reduction of thermal conductivity, have been combined and applied to the p-type (Ti/Zr/Hf)CoSb1−xSnx system. An intrinsic micrometer-scale phase separation increases the phonon scattering and reduces the lattice thermal conductivity. A substitution of 15% Sb by Sn optimizes the electronic properties. Starting from this, further improvement of the thermoelectric properties has been achieved by a fine tuning of the Ti to Hf ratio. The microstructuring of the samples was studied in detail with high-resolution synchrotron powder X-ray diffraction and element mapping electron microscop…

DiffractionFine-tuningMaterials sciencePhonon scatteringbusiness.industryGeneral ChemistryThermoelectric materialsSynchrotronlaw.inventionThermal conductivitylawPhase (matter)Thermoelectric effectMaterials ChemistryOptoelectronicsbusinessJournal of Materials Chemistry C

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