A5018077881- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Crystal Structures and Properties
- Luminescence Properties of Advanced Materials
- Chemical Synthesis and Characterization
- Inorganic Chemistry and Materials
- Solid-state spectroscopy and crystallography
- Inorganic Fluorides and Related Compounds
- Metal-Organic Frameworks: Synthesis and Applications
- Crystallography and molecular interactions
- Lanthanide and Transition Metal Complexes
- Organometallic Compounds Synthesis and Characterization
- Magnetism in coordination complexes
- Crystal structures of chemical compounds
- Perovskite Materials and Applications
- Polyoxometalates: Synthesis and Applications
- Glass properties and applications
- Advanced ceramic materials synthesis
- MXene and MAX Phase Materials
- Organometallic Complex Synthesis and Catalysis
- Advanced Condensed Matter Physics
- Layered Double Hydroxides Synthesis and Applications
- Thermal Expansion and Ionic Conductivity
- High-pressure geophysics and materials
- Synthetic Organic Chemistry Methods
University of Augsburg
2016-2025
Kiel University
2024
Augsburg University
2011-2022
TU Wien
2016
University of Freiburg
2004-2014
Institute for Physics
2014
Stuttgart Observatory
2014
Ludwig-Maximilians-Universität München
2000-2008
University of Bayreuth
2007
University of Oxford
2004
Because fossil fuels are becoming scarce and because of the expected climate change, our standard living can only be maintained by a significant increase in energy efficiency. Large amounts consumed for lighting during operation displays. Thus, targets development economical light sources like white-light-emitting diodes display panels with enhanced Solar is converted into electricity solar cells, their efficiency must improved considerably. A possible contribution might delivered phosphors...
Abstract The development and demonstration of a highly efficient warm‐white all‐nitride phosphor‐converted light emitting diode (pc‐LED) is presented utilizing GaN based quantum well blue LED two novel nitrogen containing luminescent materials, both which are doped with Eu 2+ . For color conversion the primary nitridosilicates M 2 Si 5 N 8 (orange‐red) MSi O (yellow‐green), = alkaline earth, were employed, thus achieving high luminous efficiency (25 lumen/W at 1 W input), excellent quality...
Fluorescence emission was investigated in a series of Ba2−xEuxSi5N8 compounds. Two maxima corresponding to the two crystallographic Eu2+ sites are observed. Excitation with intense laser light at 1.047 μm reveals strong fluorescence ∼600 nm due two-photon-excitation. In Ba1.89Eu0.11Si5N8 long lasting luminescence studied. The peaking about 590 has been observed dark naked eye even 15 min after removal activating lamp. This effect is recombination holes and traps consisting nitrogen vacancies...
Hydrothermal reactions of 1,2-bis(1,2,4-triazol-4-yl)ethane (btre) with copper(II), zinc(II), and cadmium(II) salts have yielded the dinuclear complexes [Zn2Cl4(mu2-btre)2] (1) [Zn2Br4(mu2-btre)2] (2), one-dimensional coordination polymer infinity1[Zn(NCS)2(2-btre)] (3), two-dimensional networks infinity2[Cu2(mu2-Cl)2(mu4-btre)] (4), infinity2[Cu2(mu2-Br)2(mu4-btre)] (5), infinity2{[Cd6(mu3-OH)2(mu3-SO4)4(mu4-btre)3(H2O)6](SO4).6H2O} (6), three-dimensional frameworks...
The hydrothermal reaction of M(NO(3))(2).4H(2)O (M = Zn and Cd) with benzene-1,4-dicarboxylic acid (H(2)bdc) or benzene-1,3-dicarboxylic (H(2)ip) 1,2-bis(1,2,4-triazol-4-yl)ethane (btre) produced the mixed-ligand coordination polymers (MOFs) {[Zn(2)(micro(2)-bdc)(2)(micro(4)-btre)]} (), {[Cd(2)(micro(4)-bdc)(micro(4)-btre)(2)](NO(3))(2).H(2)O} {[Zn(2)(micro(3)-ip)(2)(micro(2)-btre)(H(2)O)(2)].2H(2)O} (). compounds, characterized by single-crystal X-ray diffraction, powder solid-state...
Abstract Herein, the crystal structure as well second‐harmonic‐generation (SHG), thermal and spectroscopic properties of Sn[B 2 O 3 F ] (TFB = tin‐fluorooxo‐borate) are presented. TFB adopts a novel non‐centrosymmetric structure, which is determined by single‐crystal X‐ray diffraction (XRD) ( P 31 m , Z 1, 4.5072(2) Å, c 4.7624(3) Å) comprises [B 2− layers consisting solely BO tetrahedra; covalent BF bonds unequivocally localized via solid‐state NMR spectroscopy density functional theory...
The monotetrazolium redox dye 5-cyano-2,3-ditolyl tetrazolium chloride (CTC) has been used as a vital stain of actively respiring bacteria for several years. In this study, inhibitory effects on bacterial metabolism have examined in brackish water environment (Kiel Fjord, Germany) and freshwater (Elbe River, Germany). As the results from time series experiments (1 to 10 h) show, growth respiration investigated natural communities were clearly reduced by CTC supply. Compared with untreated...
The achiral chelating and bridging dihydroxymalonato (mesoxalato) ligand is a new enantiopurity enforcer in extended structures by yielding the Λ/Δ-metal configured homochiral MOFs 2D-[Ln2(μ-mesoxalato)3(H2O)6] (Ln = La(III), Gd(III)) through self-resolution during crystal growth.
Abstract The very first alkaline‐earth fluorooxoborate Ba[B 4 O 6 F 2 ] was synthesised by solid state methods starting from Ba(BF ) , β‐BaB and B 3 . crystal structure derived single‐crystal X‐ray diffraction ( P 1 / n a= 6.6384(2) Å, b= 7.6733(3) c= 11.3385(4) β =91.281(2)°, Z= 4, R int = 0.0269, 0.018, wR 0.034) comprises layers of BO tetrahedra condensed through triangular units according to the descriptor 2Δ2□:<Δ2□>Δ. extraordinary thirteen‐fold coordination barium oxygen fluorine...
The achiral chelating and bridging mesoxalato ligand (H2mesox2−), the conjugate base of mesoxalic or dihydroxymalonic acid (H4mesox), is a new enantiopurity enforcer in extended structures by yielding Λ/Δ-metal configured homochiral MOFs 2D-[Ln2(μ-H2mesox)3(H2O)6], [with Ln(III) = La (1), Ce (2), Pr (3), Nd (4), Sm (5), Eu (6), Gd (7), Tb (8), Dy (9), Er (10) Yb (11)]; through self-resolution during crystallization. Single crystals compounds have been grown agarose gel. All obtained are...
The first of its kind: K5[B(SO4)4], the example a borosulfate, comprises non-condensed [B(SO4)4]5− anions in which boron atoms are tetrahedrally coordinated to sulfate tetrahedra (see picture; B brown, O red, S yellow). compound, crystallizes polar space group, was investigated by X-ray diffraction, vibrational spectroscopy, and calculations.
New alkali borosulfates were obtained by precipitation from oleum, solid-state reactions, or thermal decomposition. The crystal structures characterized with single-crystal data. They are all based on corner-linked BO4 and SO4 tetrahedra varying coordination of the cations. According to ratio tetrahedra, different frameworks observed, i.e., noncondensed complex anions (1:4), one-dimensional chains (1:3), three-dimensional (3D) networks (1:2). This is in analogy silicates, where Si/O relates...
The phosphates α-Sr(PO3)2, SrZn(P2O7), and α-Sr2(P2O7) were doped codoped with Eu2+ Mn2+, structurally characterized, analyzed by fluorescence spectroscopy. α-Sr(PO3)2 was found to enable the energy transfer between leading a new phosphor emitting at 404 625 nm giving white light under excitation 323 nm. In SrZn(P2O7) α-Sr2(P2O7), codoping also successful but luminescence intensity of red emission be less intense. Moreover, crystal structure has been determined based on single-crystal data...
The new layered oxonitridosilicate EuSi(2)O(2)N(2) has been synthesized in a radio-frequency furnace at temperatures of about 1400 degrees C starting from europium(III) oxide (Eu(2)O(3)) and silicon diimide (Si(NH)(2)). structure the yellow material determined by single-crystal X-ray diffraction analysis (space group P1 (no. 1), a=709.5(1), b=724.6(1), c=725.6(1) pm, alpha=88.69(2), beta=84.77(2), gamma=75.84(2) ,V=360.19(9)x10(6) pm(3), Z=4, R1=0.0631, 4551 independent reflections, 175...
We have measured CO2 fluxes across phosphate solutions at different carbonic anhydrase concentrations, bicarbonate concentration gradients, and mobilities. Temperature was 22-25 degrees C, the pH of 7.0-7.3. found that under physiological conditions pCO2 a facilitated diffusion occurs in addition to free when (a) sufficient is present, (b) gradient HCO3- established along with gradient, (c) buffer has mobility comparable bicarbonate. When immobilized by attaching 0.25-mm-long cellulose...
Abstract Energiesparen ist angesagt! Eine Steigerung der Energieffizienz ermöglichen neue anorganische lumineszierende Materialien, wie sie in Displays und weißen Leuchtdioden (Bild: Farbdiagramm; Mischung drei Emissionen A–C liefert beliebige Farbtöne innerhalb des Dreiecks) zum Einsatz kommen. In Hg‐freien Leuchtstoffröhren könnten einen Beitrag Umweltschutz leisten; außerdem liefern bessere Szintillatoren für die medizinische Diagnose. magnified image Angesichts knapp werdender Rohstoffe...
Abstract The structural principles of borosulfates derived from the B/S ratio are confirmed and extended to new representatives this class showing novel motifs. According composition, Na[B(S 2 O 7 ) ] ( P 1 / c ; a =10.949(6), b =8.491(14), =12.701(8) Å; β =110.227(1)°; Z =4) K[B(S Cc =11.3368(6), =14.662(14), =13.6650(8) =94.235(1)°; =8) contain isolated [B(S − ions, in which central BO 4 tetrahedron is coordinated by two disulfate units. alkali cations have coordination numbers (Na) 8 (K),...
K4 [BS4 O15 (OH)], Ba[B2 S3 O13 ], and Gd2 [B2 S6 O24 ] were obtained by a new synthetic approach. The strategy involves initially synthesizing the complex acid H[B(HSO4 )4 which is subsequently reacted in an open system with anhydrous chlorides of K, Ba, Gd to respective borosulfates volatile molecule (HCl). Furthermore, protonated should be accessible appropriate stoichiometry starting materials, particularly closed systems, inhibit deprotonation via condensation dehydration. This approach...
Recently we reported the synthesis and characterization of Bi(H3O)[B(SO4)2]4, at that time representing only second tectosilicate analogous borosulfate. Inspired by this structure type, herein present first modular system within borosulfate chemistry. MIIIMI[B(SO4)2]4 (MIII = Bi3+, Sb3+, Lu3+; MI H3O+, NO2+, Li+, Na+, K+, Rb+, Cs+) were synthesised under solvothermal conditions show a large variability towards their mono‐ trivalent cation while retaining same 3‐dimensional anionic network....
Recently we reported the synthesis and characterization of Bi(H3O)[B(SO4)2]4, at that time representing only second tectosilicate analogous borosulfate. Inspired by this structure type, herein present first modular system within borosulfate chemistry. MIIIMI[B(SO4)2]4 (MIII = Bi3+, Sb3+, Lu3+; MI H3O+, NO2+, Li+, Na+, K+, Rb+, Cs+) were synthesised under solvothermal conditions show a large variability towards their mono‐ trivalent cation while retaining same 3‐dimensional anionic network....
Abstract The reaction of alkali sulfates and boron oxide in oleum yielded the complexes A [B(S 2 O 7 ) ] ( = Li, Na, K, NH 4 ). This way we obtained first ammonium‐containing borosulfate determined crystal structure. [ Cc , Z 8, a 11.4403(2), b 14.9439(2) c 13.8693(2) Å] crystallizes isotyp to K[B(S ]. Thermal decomposition or treatment vacuo resulted compounds with composition [B(SO One‐dimensional chain structures are for . P 4/ ncc 9.1980(1), 7.4258(1) K[B(SO 8.9739(3), 7.4114(3) H 3...
The first magnesium, manganese, cobalt, nickel, and zinc borosulfates were synthesized employing solvothermal conditions starting from the superacid H[B(HSO4)4] respective metal powders (Mg, Ni, Zn) or oxides (MnO2, CoO). α-M4[B2O(SO4)6] (M = Mg, Mn, Co, crystallize isotypically in a new structure type P3̅ (No. 147) with Z 1, 793.59(4)–810.86(9) pm, c 743.98(4)–775.09(9) pm. oligomeric anion comprises unprecedented dimeric open-branched quadruple tetrahedra {oB, 4t}[B2O(SO4)6]8–, which are...
Einen gewellten, schichtartigen [Si2O2N2]2−-Anionenverband, der aus Dreierringen aufgebaut ist, enthält das Schichtsilicat Ca[Si2O2N2] (siehe Bild). Die ungewöhnliche Struktur ergibt sich Tatsache, dass die N-Atome, anders als O-Atome in Oxosilicaten, jeweils drei benachbarte Si-Tetraederzentren den Schichten verbrücken, während ausschließlich terminal an Si-Atome gebunden sind.