Professur Koordinationschemie
Koordinationschemie
Teaser

Tagungsbesuche in Weimar, Münster und Oldenburg

Philipp Kitschke, Max Hofmann, Marcus Weber, Christian Leonhardt und Benjamin Büchter präsentierten in Weimar, Münster und Oldenburg ihre aktuellen Forschungsergebnisse zu den Themen Zwillings-Polymerisation, Photokatalyse, Hybridmaterialen und Bismutoxide.

Forschungsarbeiten zu DFG Projekt begonnen

Im Rahmen des SPP 1807 „Control of London dispersion interactions in molecular chemistry“ werden in Zusammenarbeit mit Prof. Dr. A. Auer vom Max Plank Institut für chemische Energiekonversion (Mülheim) Dispersionswechselwirkungen von Aromaten mit schweren Hauptgruppenelementen untersucht.

Wir freuen uns über ein neues Teammitglied

Promotion begonnen

Herstellung nanostrukturierter Mischoxide und Hybridmaterialien mit Phosphorsäuregruppen

Benjamin Mielke

Kooperation mit Prof. Dr. S. Spange, Professur Polymerchemie
 

Publikationen und Tagungsbeiträge

Iron–Bismuth Halido Compounds: Molecules, Clusters, and Polymers

K. Wójcik, A. M. Preda, L. Mertens, P. Ecorchard, T. Rüffer, H. Lang, M. Mehring:
Inorg. Chem. 201554, 3905-3912

Abstract The reaction between [FeCp*(CO)2]2 and BiX3 (X = Cl, Br), followed by halogen exchange reaction with KI, gave the pentamethylcyclopentadienyl-substituted iron?bismuth complexes [Bi{FeCp*(CO)2}X2] [X = Cl, Br, I, Cp* = ?5-C5Me5], as expected. However, by subtle change of the reaction conditions, the complexes [FeCp*(CO)2(CH3CN)]2n[Bi4Cl14]n and [{FeCp*(CO)2}2Br]2[Bi6Br22{FeCp*(CO)2}] became accessible, which are composed of a new coordination polymer and an unpredicted heterobimetallic halido cluster of bismuth, respectively.
Abstract

 

Nonaqueous Synthesis of a Bismuth Vanadate Photocatalyst By Using Microwave Heating: Photooxidation versus Photosensitized Decomposition in Visible-Light-Driven Photocatalysis 

M. Hofmann, M. Rainer, S. Schulze, M. Hietschold, M. Mehring:
ChemCatChem 20157, 1357-1365

Abstract A new synthetic route to monoclinic bismuth vanadate using a concept adapted from a nonaqueous synthesis strategy for nanostructured organic?inorganic hybrid materials and metal oxides, introduced recently as twin polymerization, is reported. Microwave-assisted synthesis starting from bismuth(III) tert-butoxide and vanadium(V) oxytri(tert-butoxide) in the presence of 2-methoxybenzyl alcohol, 2,4-dimethoxybenzyl alcohol, and 2-(2-thienyl)iso-propyl alcohol gave hybrid materials, which were characterized by solid-state 13C?NMR spectroscopy, CH analysis, atomic absorption spectroscopy, and energy dispersive X-ray spectroscopy. Subsequent pyrolysis resulted in nanoscale monoclinic bismuth vanadate that showed a high photocatalytic activity. The photocatalytic decomposition of model pollutants such as rhodamine?B (RhB), methyl orange, methylene blue, and orange G under visible-light irradiation using the as-prepared bismuth vanadate samples was studied with a focus on the influence of the agglomeration behavior. The interplay between the photooxidation of RhB, induced by the excitation of the catalyst using visible light, and the photosensitized decomposition pathway is demonstrated by degradation experiments in solution and the solid state.
Abstract

Zirconium and Hafnium Twin Monomers for Mixed Oxides

C. Schliebe, T. Gemming, J. Noll, L. Mertens, M. Mehring, A. Seifert, S. Spange, H. Lang:
ChemPlusChem 2015, 3, 559-567

Abstract The synthesis of Zr and Hf twin monomers of type [M(2-OCH2cC4H3O)4(x?HOCH2cC4H3O)] (3, M=Zr, x=0; 4, M=Hf, x=1) and M[(2-OCH2-C6H4O)2(2-HOCH2-C6H4OH)] (5, M=Zr; 6, M=Hf) by reacting M(OR)4 (M=Zr, R=nC3H7, 1; M=Hf, R=nC4H9, 2) with 2-furylmethanol or 2-hydroxybenzyl alcohol is discussed. Complexes?3?6 were homopolymerized under acidic conditions. Additionally, 5 and 6 were copolymerized with 2,2?-spirobi[4?H-1,3,2-benzodioxasiline] (SBS). Under acidic conditions SBS forms a phenolic resin/SiO2 nanostructured material. The resulting hybrid materials from the homopolymerization of 3?6 and the copolymerized materials from 5 and 6 were characterized by standard solid-state analytics. The inorganic lattice of the MO2 materials from the homopolymerized complexes?3?6 and SiO2/MO2 from the copolymerization of 5 and 6 with SBS was obtained by air oxidation. The oxide materials were characterized by X-ray powder diffraction (XRPD) and energy-dispersive X-ray analysis, which proved their identity. The inner surface area was determined by N2 adsorption/desorption studies, which revealed surface areas of 100?m2?g?1 for MO2. The mixed oxides SiO2/MO2 were additionally investigated by differential scanning calorimetry and variable-temperature XRPD to study the thermal behavior. It was found that crystallization of tetragonal MO2 nanoparticles is characteristic within the SiO2 matrix, but higher sintering temperatures caused crystallization of the SiO2 lattice.
Abstract

Two in one: the bismuth bromido clusters in [Bi6Cp*6Br9][Bi7Br24]

K. Wojcik, A. M. Preda, T. Rüffer, H. Lang, M. Mehring:
Main Group Met. Chem. 2014, 37, 119-124

Abstract The reaction of [FeCp*(CO)2]2 in CH2Cl2 with BiBr3 in a 1:1 molar ratio gave the novel bismuth compound [Bi6Cp*6Br9][Bi7Br24] (1), which is composed of a cationic and an anionic bismuth bromido cluster: the cation is based on a hexanuclear bismuth {Bi6}-octahedron and the anion showing the first heptanuclear bismuth-bromido cluster within the class of bromido bismuthates.
Abstract

Bismuth(III) benzohydroxamates: powerful anti-bacterial activity against Helicobacter pylori and hydrolysis to a unique Bi34 oxido-cluster [Bi34O22(BHA)22(H-BHA)14(DMSO)6]

A. Pathak, V. L. Blair, R. L. Ferrero, M. Mehring, P. C. Andrews:
Chem. Commun. 2014, 50, 15232-15234

Abstract Reaction of BiPh3 or Bi(OtBu)3 with benzohydroxamic acid (H2-BHA) results in formation of novel mono- and di-anionic hydroxamato complexes; [Bi2(BHA)3]? 1, [Bi(H-BHA)3] 2, [Bi(BHA)(H-BHA)] 3, all of which display nM activity against Helicobacter pylori. Subsequent dissolution of [Bi2(BHA)3]? in DMSO/toluene results in hydrolysis to the first structurally authenticated {Bi34} oxido-cluster [Bi34O22(BHA)22(H-BHA)14(DMSO)6] 4.
Abstract
   
 

GDCh-Vortrag

Raum 1/232  16:00 Uhr

Dr. Alla Synytska – Leibniz-Institut für Polymerforschung Dresden e. V. –

From Hybrid Janus Particles to Multifunctional Materials

30. Apr. 2015

GDCh-Vortrag

Raum 1/232  16:00 Uhr

Prof. Dr. Sven Kureti – TU Bergakademie Freiberg –

Rost statt Edelmetall – über die CO-Oxidation an Eisenoxid-Katalysatoren

07. Mai 2015

Arbeitsgruppenseminar

Raum 1/367A  9.15 Uhr

Benjamin Mielke - Aktuelle Forschungsergebnisse

08. Mai 2015

GDCh-Vortrag

Raum 1/232  16:00 Uhr

Prof. Barbara Kirchner – Rheinische Friedrich Wilhelms-Universität Bonn –

21. Mai 2015

Arbeitsgruppenseminar

Raum 1/367A  9.15 Uhr

Lydia Wrobel - Aktuelle Forschungsergebnisse

22. Mai 2015

GDCh-Vortrag

Raum 1/232  16:00 Uhr

Prof. Dr. Christina Roth – Freie Universität Berlin –

Methoden- und Materialentwicklung für elektrochemische Energietechnologien: Kohlenstoffmaterialien in Vanadium-Redox-Flow-Batterien (VRFB)

28. Mai 2015

GDCh-Vortrag

Raum 1/232  16:00 Uhr

Prof. Dr. Sven Rau – Universität Ulm –

Supramolecular Hydrogen Evolving Photocatalysis

04. Juni 2015

Arbeitsgruppenseminar

Raum 1/367A  9.15 Uhr

Marcus Weber - Aktuelle Forschungsergebnisse

05. Juni 2015

GDCh-Vortrag

Raum 1/232  16:00 Uhr

Prof. Dr. Peer Schmidt – Brandenburgische Technische Universität Cottbus-Senftenberg

Flüchtige Bekannte: Analyse der Phasenbildung mit Elementen der Gruppen 15 und 16

11. Juni 2015

Doktorandenseminar

18. Juni 2015

Arbeitsgruppenseminar

Raum 1/367A  9.15 Uhr

Lutz Mertens - Aktuelle Forschungsergebnisse

19. Juni 2015

GDCh-Vortrag

Raum 1/232  16:00 Uhr

Prof. Dr. Florian Kraus – Philipps-Universität Marburg –

Überraschungen auf dem Weg zum Kupfer(I)-fluorid und ein neuer Weg zu Metallaziden

02. Juli 2015

Arbeitsgruppenseminar

Raum 1/367A  9.15 Uhr

Philipp Kitschke - Aktuelle Forschungsergebnisse

03. Juli 2015

GDCh-Vortrag

Raum 1/232  16:00 Uhr

Prof. Markus Albrecht – Rheinisch-Westfälische Technische Hochschule Aachen –

Molekulare Erkennung, Selbstorganisation und supramolekulare Funktion

09. Juli 2015

Arbeitsgruppenseminar

Raum 1/367A  9.15 Uhr

Christian Leonhardt - Aktuelle Forschungsergebnisse

17. Juli 2015

Arbeitsgruppenseminar

Raum 1/367A  9.15 Uhr

Ronny Fritzsche - Aktuelle Forschungsergebnisse

14. Aug. 2015

Arbeitsgruppenseminar

Raum 1/367A  9.15 Uhr

Dr. Ana-Maria Preda - Aktuelle Forschungsergebnisse

28. Aug. 2015

Arbeitsgruppenseminar

Raum 1/367A  9.15 Uhr

Felix Dannenberg - Aktuelle Forschungsergebnisse

11. Sept. 2015

 

Prof. Dr. Michael Mehring

Technische Universität Chemnitz
Institut für Chemie
Professur Koordinationschemie
Straße der Nationen 62
D-09111 Chemnitz

E-mail: michael.mehring@...

Tel.: +49 (0) 371 531 - 21250
Fax: +49 (0) 371 531 - 21219

 

Sekretariat: Frau Jutta Ruder
Raum: 1/157
Tel.: +49 (0) 371 531 - 31200
Fax: +49 (0) 371 531 - 21219