@article{WangWangHuetal.2015, author = {Wang, Xuebin and Wang, Xiaoli and Hu, Jing and Wang, Zhaoya and Pimpalpalle, Tukaram M. and Linker, Torsten and Yin, Jian}, title = {Study on the Synthesis of Novel Sugar Amino Acids}, series = {Acta chimica Sinica = Huaxue-xuebao}, volume = {73}, journal = {Acta chimica Sinica = Huaxue-xuebao}, number = {7}, publisher = {Science China Press}, address = {Beijing}, issn = {0567-7351}, doi = {10.6023/A15030205}, pages = {699 -- 704}, year = {2015}, abstract = {Sugar amino acids (SAAs) are carbohydrate derivatives bearing both amino and carboxylic acid functional groups. SAAs represent an important class of multifunctional building blocks, which are amenable to serve as glycomimetics or peptidomimetics with well-defined structures and useful properties. Because SAAs exist in nature in many forms with various biological activities, recently, many unnatural SAAs, as the demand for finding new molecules to discover new drugs and new materials, have been designed and synthesized by a number of research groups. In this paper, we have developed a convenient method for the synthesis of novel SAAs gluco-7 and galacto-7 for the first time. The structure of gluco-7 was similar to the natural SAA glucosaminuronic acid that was a component of many typical bacterial cell walls and could be used for the preparation of type D flu vaccine; while galacto-7 was similar to the natural SAA galactosaminuronic acid that was one of bacterial Vi-antigen components of Escherichia coli. Starting from unexpensive and commercially available 3,4,6-tri-O-acetyl-D-glucal and 3,4,6-tri-O-acetyl-D-galactal, two novel SAAs gluco-7 and galacto-7 were achieved in the linear 6 steps with 34\% overall yield and 19\% overall yield, respectively. The key reactions included radical addition, decarboxylation, iodine generation reaction, azide reaction and reductive amination reaction. The crucial step was the synthesis of the target compound gluco-7 from gluco-6. By using method A, the target compound gluco-7 was obtained in 4 steps with 63\% overall yield. To optimize the transformation from gluco-6 to gluco-7, method B was developed to generate gluco-7 by using one-pot reaction successfully with 76\% yield only in one step. It proved that method B was superior to method A with shorter steps and higher yields. All the new compounds were characterized by IR, H-1 NMR, C-13 NMR and HRMS data. Study on the synthesis and biological evaluation of linear and cyclic oligomers derived from gluco-7 and galacto-7 are currently in progress.}, language = {zh} } @phdthesis{Raju2021, author = {Raju, Rajarshi Roy}, title = {'Smart' Janus emulsions}, school = {Universit{\"a}t Potsdam}, year = {2021}, abstract = {Emulsions constitute one of the most prominent and continuously evolving research areas in Colloid Chemistry, which involves the preparation of mixtures or dispersions of immiscible components in a continuous medium. Besides conventional oil-in-water or water-in-oil emulsions, other emulsions of complex droplet morphologies have recently attracted significant research interests. Especially Janus emulsions, in which each droplet is comprised of two distinct sub-regions, have shown versatile potential applications. One of their advantages is the possibility of compartmentalization, which enables to play with two different chemistries in a single droplet. Though microfluidic methods are conventionally used to prepare Janus emulsions, their industrial applications are largely hindered by low throughput and extensive instrumentations. Recently, it has been discovered that simply one-pot moderate/high energy emulsification is also capable of developing Janus morphology, although their preparation and stabilization remain rather substantially challenging. This cumulative doctoral thesis focuses on the preparation and characterization of 'smart' Janus emulsions, i.e. Janus emulsions with special stimuli-responsive features. One-step moderate/high energy emulsification of olive and silicone oil in an aqueous medium was carried out. Special consideration was devoted to the interfacial tensions among the components to maintain the criteria of forming characteristic droplet architectures, in addition to avoiding multiple emulsion destabilization phenomena like imminent phase separation or even separated droplet formation. A series of investigations were conducted related to the formation of complexes of charged macromolecules and role of them as stabilizers to achieve stable Janus emulsions for a realistic timeframe (more than 3 months). The correlation between the size of the stabilizer particles and the droplet size of emulsion was established. Furthermore, it was observed that Janus emulsion gels with interesting rheological properties can be fabricated in the presence of suitable polyelectrolyte complexes. Janus emulsions that could be influenced by pH, temperature or magnetic field were successfully produced in presence of characteristic stimuli-responsive stabilizers. Afterwards, the effect of these changes was studied by different characterization techniques. The size and morphology could be tuned easily by changing the pH. The incorporation of iron oxide magnetic nanoparticles (synthesized separately by a co-precipitation method) to one component of the Janus emulsion was carried out so that the movement and orientation of the complex droplets in aqueous media could be controlled by an external magnetic field. Additionally, temperature-triggered instantaneous reversible breakdown of Janus droplets was also accomplished. The responses of the Janus droplets by the stimuli were well-documented and explained. Another goal of the present contribution was to exploit this special morphological feature of emulsions as a template for producing porous materials. This was demonstrated by the preparation of ultralight magnetic responsive aerogels, utilizing Janus emulsion gels. The produced aerogels also showed the capacity to separate toxic dye from water. To the best of our knowledge, this is the first example of investigation towards batch scale production of Janus emulsion with such special stimuli-responsive properties by a simple bulk emulsification method.}, language = {en} } @phdthesis{Hoernke2011, author = {H{\"o}rnke, Maria}, title = {ß-Sheet formation of amyloidogenic model peptides at hydrophobic-hydrophilic interfaces}, address = {Potsdam}, pages = {107, XXI S.}, year = {2011}, language = {en} } @phdthesis{Janietz2002, author = {Janietz, Silvia}, title = {Zusammnenh{\"a}nge zwischen Struktur, elektrochemischem Redoxverhalten und dem Einsatz von organischen Halbleitern in der Elektronik}, pages = {78 S., Anh.}, year = {2002}, language = {de} } @article{ThomasKleinpeter1995, author = {Thomas, Steffen and Kleinpeter, Erich}, title = {Zur Zuordnung der 13C-Chemischen Verschiebungen substituierter Naphthaline aus Ladungsdichten mit Hilfe eines neuronalen Netzes}, year = {1995}, language = {de} } @article{HermannsSchmidt2017, author = {Hermanns, Jolanda and Schmidt, Bernd}, title = {Zur Verwendung von QR-Codes in Uni-Seminaren - ein Baustein in den neu konzipierten {\"U}bungen zur Vorlesung „Organische Chemie f{\"u}r Studierende im Nebenfach"}, series = {Chemkon}, volume = {24}, journal = {Chemkon}, publisher = {Wiley-VCH}, address = {Weinheim}, issn = {0944-5846}, doi = {10.1002/ckon.201710300}, pages = {139 -- 141}, year = {2017}, abstract = {Die Verwendung von QR-Codes in Begleitseminaren zur Vorlesung „Organische Chemie" f{\"u}r Studierende mit Chemie im Nebenfach wird vorgestellt. Die Hausaufgaben zu den Seminaren wurden mit einem QR-Code versehen. Dieser f{\"u}hrt zu weiterf{\"u}hrenden Hilfen. Der Einsatz der QR-Codes sowie die Neukonzeption der Seminare wurden evaluiert.}, language = {de} } @article{StroehlKleinpeter1993, author = {Str{\"o}hl, D. and Kleinpeter, Erich}, title = {Zur Stereochemie acyclischer Verbindungen : III. Bestimmung der Vorzugskonformstion unterschiedlich substituirternY-Chlorpropylether}, year = {1993}, language = {de} } @article{BreternitzLehmannBarnettetal.2019, author = {Breternitz, Joachim and Lehmann, Frederike and Barnett, Sarah A. and Nowell, Harriott and Schorr, Susan}, title = {Zur Rolle der Iodid-Methylammonium-Interaktion in der Ferroelektrizit{\"a}t in CH3NH3PbI3}, series = {Angewandte Chemie}, volume = {132}, journal = {Angewandte Chemie}, number = {1}, publisher = {John Wiley \& Sons, Inc.}, address = {New Jersey}, pages = {5}, year = {2019}, abstract = {Ihre außergew{\"o}hnlich hohen Konversionseffizienzen von {\"u}ber 20 \% und die einfache Zellherstellung machen Hybridperowskite zu heißen Kandidaten f{\"u}r alternative Solarzellenmaterialien. CH3NH3PbI3 als Archetyp dieser Materialklasse besitzt außergew{\"o}hnliche Eigenschaften wie eine sehr effiziente Umwandlung von Solarenergie, wobei besonders Ferroelektrizit{\"a}t als m{\"o}gliche Erkl{\"a}rung in den Fokus ger{\"u}ckt ist. Diese erfordert allerdings eine nicht-zentrosymmetrische Kristallstruktur als notwendige Voraussetzung. Wir stellen hier eine Erkl{\"a}rung des Symmetriebruchs in diesem Material auf kristallographischem, d. h. fernordnungs-basiertem, Wege vor. W{\"a}hrend das Molek{\"u}lkation CH3NH3+ intrinsisch polar ist, ist es extrem fehlgeordnet und kann deshalb nicht die einzige Erkl{\"a}rung darstellen. Es verzerrt allerdings das umgebende Kristallgitter und ruft dadurch eine Verschiebung der Iod-Atome von den zentrosymmetrischen Positionen hervor.}, language = {de} } @phdthesis{Utecht2015, author = {Utecht, Manuel Martin}, title = {Zur Optimierung und dem Auslesen molekularer Schalter}, school = {Universit{\"a}t Potsdam}, pages = {143}, year = {2015}, language = {de} } @phdthesis{Priester1999, author = {Priester, Torsten}, title = {Zur L{\"o}sung eines thermodynamischen Ph{\"a}nomens der Adsorption amphiphiler Stoffe an fluiden Phasengrenzfl{\"a}chen : die lineare Abh{\"a}ngigkeit der Gleichgewichtsoberfl{\"a}chenspannung vom Logarithmus der Volumenkonzentration}, series = {UFO Dissertation}, volume = {372}, journal = {UFO Dissertation}, publisher = {UFO Atelier f{\"u}r Gestaltung und Verl.}, address = {Allensbach}, isbn = {3-930803-71-2}, pages = {131 S. : graph. Darst.}, year = {1999}, language = {de} }