Gutenberg Open Science

The Open Science Repository of Johannes Gutenberg University Mainz.

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Recent Submissions

  • Item type: Item , SammelbandAccess status: Open Access ,
    S. Maria dell'Anima : zur Geschichte einer "deutschen Stiftung" in Rom
    (2010) Matheus, Michael; Deutsches Historisches Institut in Rom
  • Item type: Item , ZeitschriftenaufsatzAccess status: Open Access ,
    1,2,4-Tris(5-aryl-1,3,4-oxadiazolyl)-benzenes : novel λ-shaped fluorescent liquid crystals
    (2025) Graschtat, Vincent; Proz, Igor; Lehmann, Matthias; Detert, Heiner
    This study explores the development of λ-shaped liquid crystalline compounds with unique mesophase behaviour and fluorescence properties. We synthesized highly fluorescent λ-shaped mesogens incorporating oxadiazole moieties. Thermal characterization using DSC and POM reveals that tris(oxadiazolyl)benzenes (TOBs) with linear alkyl chains exhibit an enantiotropic mesophase over small temperature ranges, while branched derivatives show much broader enantiotropic mesophases. WAXS analysis indicates a hexagonal columnar arrangement. Optical studies demonstrate bright turquoise fluorescence with hypsochromic shifts in non-polar solvents. Our findings offer a new perspective on the design and application of liquid crystalline materials, potentially leading to more efficient and versatile optoelectronic devices.
  • Item type: Item , ZeitschriftenaufsatzAccess status: Open Access ,
    1,4-Oxazepan-7-one trifluoroacetate: a modular monomer precursor for the synthesis of functional and biodegradable poly(amino esters)
    (2025) Mackiol, Tino; Pascouau, Chloé; Nagel, Manuel; Bizmark, Tamara M.; Montesel, Luca; Fischer-Schuch, Jochen; Besenius, Pol
    N-Acylated poly(amino esters) (PAEs) synthesized via organocatalytic ring-opening polymerization (ROP) offer potential for tailored, functional and degradable polymers. In this study, a universal monomer precursor toward N-acylated-1,4-oxazepan-7-ones (OxP)s was synthesized using a three-step approach, allowing for the introduction of various functional groups. Two novel oxidation sensitive OxP monomers bearing a double bond and a sulfide group were designed, as well as two monomers with alkyl moieties. The organocatalytic ROP of the OxP monomers using 1,8-diazabicyclo[5.4.0]undec-7-en (DBU) and 1-(3,5-bis(trifluoromethyl)phenyl)-3-cyclohexyl thiourea (TU) as catalysts was investigated. Polymerizations were performed under ambient temperature, affording homopolymers with narrow dispersities (Ð = 1.09–1.13). As a proof of concept, a post-polymerization thiol–ene functionalization of the allyl functional PAE was performed via photo-rheology experiments. Finally, the (bio)degradability of the N-acylated poly(amino esters) was evaluated through a series of degradation studies under mild enzymatic catalysis, in neutral phosphate-buffered saline solution and under accelerated conditions.