Fachgebiet Anorganische Chemie - Festkörper- und Materialchemie
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17 Submissions in this community.

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Band gap engineering: the role of anions

Anke, Björn (2017)

The degradation of harmful organic pollutants with the help of semiconductors is regarded as one of the crucial solutions for waste water treatment. The main disadvantage of extensively used photoc...

Unravelling ultraslow lithium-ion diffusion in γ-LiAlO2

Wiedemann, Dennis; Nakhal, Suliman; Rahn, Johanna; Witt, Elena; Islam, Mazharul M.; Zander, Stefan; Heitjans, Paul; Schmidt, Harald; Bredow, Thomas; Wilkening, Martin; Lerch, Martin (2016)

Lithium aluminum oxide (γ-LiAlO2) has been discussed and used for various applications, e.g., as electrode coating, membrane, or tritium breeder material. Although lithium-ion diffusion in this sol...

Synthesis and structural characterization of semiconductors based on kesterites

Ritscher, Anna (2016)

The here-presented thesis provides detailed investigations on the structural characteristics of the chalcogenide Cu2ZnSnS4 (CZTS). This semiconductor material is a promising candidate for absorber ...

Beiträge zur Nachhaltigkeit von chemischen Verfahren

Weidauer, Maik (2016)

Der Erste Teil der Arbeit beschäftigt sich mit der Synthese und Anwendung von Eisenkomplexen in der eisenkatalysierten oxidativen Kupplung von Magnesiumorganylen mit Hilfe von Distickstoffmonoxid a...

Lithium diffusion pathways in metastable ramsdellite-like Li2Ti3O7 from high-temperature neutron diffraction

Wiedemann, Dennis; Nakhal, Suliman; Franz, Alexandra; Lerch, Martin (2016-10)

Ramsdellite-like Li2Ti3O7 is an excellent, strongly anisotropic lithium-ion conductor with various proposed applications in energy storage and lithium processing. Diffusion pathways have not yet be...

,, ... und ehrt mir ihre Kunst!“ – Evaluierung historischer und neuer Synthesewege zu 1,5-Dihydroxy-6-oxo-1,6-dihydropyridin-2-carbonsäure und 1,3-Dihydroxy-2-oxo-3-pyrrolin-4-carbonsäure

Wiedemann, Dennis; Grohmann, Andreas (2009)

The historical and recent literature describing synthetical pathways to the title compds. is comprehensively summarized and evaluated. Routes via 2,5-dioxoadipic acid or 2,5-dihydroxymuconic acid a...

Bond activation in iron(II) and nickel(II) complexes of polypodal phosphanes

Gentschow, Simon-Andreas; Kohl, Stephan W.; Bauer, Walter; Heinemann, Frank W.; Wiedemann, Dennis; Grohmann, Andreas (2010)

A pyridine-derived tetraphosphane ligand (donor set: NP4) has been found to undergo remarkably specific C-P bond cleavage reactions, thereby producing a ligand with an NP3 donor set. The reaction m...

(OC-6-13)-Difluoridooxidobis(propan-2-ol)(propan-2-olato)vanadium(V)

Kohl, Julia; Wiedemann, Dennis (2013)

The distorted octahedral title complex, [V-V(C3H7O)(C3H8O)(2)F2O], was synthesized via ligand exchange at [(VO)-O-V(OiPr)(3)] with aqueous hydrogen fluoride in propan-2-ol and crystallized from (D)...

Substituted bisphosphanylamines as ligands in gold(I) chemistry – synthesis and structures

Wiedemann, Dennis; Gamer, Michael T.; Roesky, Peter W. (2009)

Dimethyl 5-aminoisophthalate, which is a building block of amino-substituted tetralactam macrocycles, was used as ligand in gold(I) chemistry to form model complexes for macrocyclic gold compounds....

3d-and 4d-metal(II) complexes of a tris(pyridyl)ethane-derived N-4 ligand – a structural study and reactivity remarks

Wiedemann, Dennis; Grohmann, Andreas (2014)

A series of complexes of the new N-4 chelate ligand L (L = 1-{6-[1,1-bis(pyridin-2-yl) ethyl] pyridin-2-yl}-N, N-dimethylmethanamine) with intermediate to late divalent transition metal ions M was ...

Controlled ligand distortion and its consequences for structure, symmetry, conformation and spin-state preferences of iron(II) complexes

Kroll, Nicole; Theilacker, Kolja; Schoknecht, Marc; Baabe, Dirk; Wiedemann, Dennis; Kaupp, Martin; Grohmann, Andreas; Hörner, Gerald (2015)

The ligand-field strength in metal complexes of polydentate ligands depends critically on how the ligand backbone places the donor atoms in three-dimensional space. Distortions from regular coordin...

Ternary transition-metal fluoride precursors for the fluorolytic sol-gel route: new insights into speciation and decomposition

Kohl, Julia; Wiedemann, Dennis; Troyanov, Sergej I.; Palamidis, E.; Lerch, Martin (2015)

The nanoscaled ternary transition-metal fluorides Li3MF6 (M = V, Fe, Mn) and Li2NiF4 are promising candidates for cathode materials in high-voltage lithium-ion batteries. The fluorolytic route to t...

The high-temperature transformation from 1T-to 3R-LixTiS2 (x=0.7, 0.9) as observed in situ with neutron powder diffraction

Wiedemann, Dennis; Nakhal, Suliman; Senyshyn, Anatoliy; Bredow, Thomas; Lerch, Martin (2015)

Layered titanium disulfide is used as lithium-ion intercalating electrode material in batteries. The room-temperature stable trigonal IT polymorphs of the intercalates LixTiS2(x <= 1) are widely-in...

Lithium diffusion pathways in 3R-LixTiS2: a combined neutron diffraction and computational study

Wiedemann, Dennis; Islam, Mazharul M.; Nakhal, Suliman; Senyshyn, Anatoliy; Bredow, Thomas; Lerch, Martin (2015)

Layered lithium transition-metal sulfides have long been discussed as early electrode materials for lithium-ion batteries. However, fundamental knowledge of lithium-ion migration in these solids is...

Thiocyanate anchors for salt-like iron(II) complexes on Au(111): promises and caveats

Stock, Philipp; Erbe, Andreas; Buck, Manfred; Wiedemann, Dennis; Ménard, Hervé; Hörner, Gerald; Grohmann, Andreas (2014)

The formation of self-assembled monolayers (SAMs) on Au(111) from solution has been investigated for two ionic iron(II) complexes of the type [Fe(L)](BF4)(2), where L is tripodal hexadentate and co...

LiBi3S5-A lithium bismuth sulfide with strong cation disorder

Nakhal, Suliman; Wiedemann, Dennis; Stanje, Bernhard; Dolotko, Oleksandr; Wilkening, Martin; Lerch, Martin (2016)

Among chalcogenide semiconductors for thermoelectric applications, alkali-metal bismuth compounds occur in many complex compositions favorable for high performance. Although LiBi3S5 had been announ...

Single-crystal neutron diffraction on gamma-LiAlO2: structure determination and estimation of lithium diffusion pathway

Wiedemann, Dennis; Indris, Sylvio; Meven, Martin; Pedersen, Björn; Boysen, Hans; Uecker, Reinhard; Heitjans, Paul; Lerch, Martin (2016)

gamma-Lithium aluminum oxide is a paradigmatic example of an ultraslow lithium ion conductor. This characteristic plays a crucial role in its proposed and actual applications. Herein, we report on ...