35936
2012
2012
eng
2341
2352
12
14
article
Wiley-VCH
Weinheim
1
--
--
--
Complexation of Palladium(II) with unsaturated Dithioethers a systematic development of highly selective ligands for solvent extraction
There is a demand for new and robust PdII extractants due to growing recycling rates. Chelating dithioethers are promising substances for solvent extraction as they form stable square-planar complexes with PdII. We have modified unsaturated dithioethers, which are known to coordinate PdII, and adapted them to the requirements of industrial practice. The ligands are analogues of 1,2-dithioethene with varying electron-withdrawing backbones and polar end-groups. The crystal structures of several ligands and their palladium complexes were determined as well as their electro- and photochemical properties, complex stability and behaviour in solution. Solvent extraction experiments showed the superiority of some of our ligands over conventionally used extractants in terms of their very fast reaction rates. With highly selective 1,2-bis(2-methoxyethylthio)benzene (4) it is possible to extract PdII from a highly acidic medium in the presence of other base and palladium-group metals.
European journal of inorganic chemistry : a journal of ChemPubSoc Europe
10.1002/ejic.201101406
1434-1948
wos:2011-2013
WOS:000303497900003
Holdt, HJ (reprint author), Univ Potsdam, Inst Chem, Dept Inorgan Chem, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany., holdt@uni-potsdam.de
Arbeitsgemeinschaft industrieller Forschungsvereinigungen "Otto von Guericke" e.V. (AIF); ReMetall Drochow GmbH
Juliane Träger
Tillmann Klamroth
Alexandra Kelling
Susanne Lubahn
Ernst Cleve
Wulfhard Mickler
Matthias Heydenreich
Holger Müller
Hans-Jürgen Holdt
eng
uncontrolled
Renewable resources
eng
uncontrolled
Palladium
eng
uncontrolled
Chelates
eng
uncontrolled
Ligand design
eng
uncontrolled
S li-gands
Institut für Chemie
Referiert
35723
2012
2012
eng
10506
10510
5
34
18
article
Wiley-VCH
Weinheim
1
--
--
--
N-2-Pyridinylmethyl-N '-arylmethyl-diaminomaleonitriles: New Highly Selective Chromogenic Chemodosimeters for Copper(II)
Chemistry - a European journal
10.1002/chem.201201731
0947-6539
wos:2011-2013
WOS:000307387300007
Holdt, HJ (reprint author), Univ Potsdam, Inst Chem, Karl Liebknecht Str 24-25, D-14476 Golm, Germany., holdt@chem.uni-potsdam.de
Deutsche Forschungsgemeinschaft [HO 1706/6-2]
Thomas Schwarze
Alexandra Kelling
Holger Müller
Michael Trautmann
Tillmann Klamroth
Otto Baumann
Peter Strauch
Hans-Jürgen Holdt
eng
uncontrolled
amides
eng
uncontrolled
chemodosimeter
eng
uncontrolled
colorimetric detection
eng
uncontrolled
copper
eng
uncontrolled
sensors
eng
uncontrolled
UV
eng
uncontrolled
Vis spectroscopy
Institut für Chemie
Referiert
30881
2007
2007
eng
article
1
--
--
--
Luminescence detection of open-shell transition-metal ions by photoinduced electron transfer controlled by internal charge transfer of a receptor
http://onlinelibrary.wiley.com/doi/10.1002/ange.200603992/pdf
10.1002/anie.200603992
allegro:1991-2014
10104026
Angewandte Chemie. - 119 (2007), S. 1701 - 1704
Thomas Schwarze
Holger Mueller
Carsten Dosche
Tillmann Klamroth
Wulfhard Mickler
Alexandra Kelling
Institut für Chemie
37095
2011
2011
eng
2793
2803
11
12
35
article
Royal Society of Chemistry
Cambridge
1
--
--
--
Tetrahalidocuprates(II)-structure and EPR spectroscopy Part 1: Tetrabromidocuprates(II)
Tetrahalidocuprates(II) show a high degree of structural flexibility. We present the results of crystallographic and electron paramagnetic resonance (EPR) spectroscopic analyses of four new tetrabromidocuprate(II) compounds and compare the results with previously reported data. The cations in the new compounds are the sterically demanding benzyltriphenylphosphonium, methyltriphenylphosphonium, tetraphenylphosphonium, and hexadecyltrimethylammonium ions; they were used to achieve a reasonable separation of the paramagnetic Cu(II) ions for EPR spectroscopy. X-Ray crystallography shows that in all four complexes the [CuBr4](2-) units have a distorted tetrahedral coordination geometry which is in agreement with DFT calculations. The EPR hyperfine structure was not resolved. This is due to the exchange broadening resulting from still incomplete separation of the paramagnetic Cu(II) centres. Nevertheless, the principal values of the electron Zeemann tensor (g(parallel to) and g(perpendicular to)) of the complexes could be determined. A correlation of structural (X-ray) parameters with the spin density at the copper centres (DFT) is well reflected in the EPR spectra of the bromidocuprates. This enables the correlation of X-ray and EPR parameters to predict the structure of tetrabromidocuprates in physical states other than the crystalline state. As a result, we provide a method to structurally characterize [CuBr4](2-) in, for example, ionic liquids or in solution, which has important implications for e.g. catalysis or materials science.
New journal of chemistry
10.1039/c1nj20271e
1144-0546
wos:2011-2013
WOS:000297222300010
Strauch, P (reprint author), Univ Potsdam, Inst Chem, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany., pstrauch@uni-potsdam.de
Ministry of Higher Education of Syria; German Research Council;
University of Potsdam; MPI of Colloids and Interfaces (Colloid Chemistry
Department)
Ramzi Farra
Kerstin Thiel
Alette Winter
Tillmann Klamroth
Andreas Poeppl
Alexandra Kelling
Uwe Schilde
Andreas Taubert
Peter Strauch
Institut für Chemie
Referiert
38321
2014
2014
eng
1019
1030
12
3
38
article
Royal Society of Chemistry
Cambridge
1
--
--
--
Tetrahalidocuprates(II) - structure and EPR spectroscopy. Part 2: tetrachloridocuprates(II)
We present and discuss the results of crystallographic and electron paramagnetic resonance (EPR) spectroscopic analyses of five tetrachloridocuprate(II) complexes to supply a useful tool for the structural characterisation of the [CuCl4](2-) moiety in the liquid state, for example in ionic liquids, or in solution. Bis(benzyltriethylammonium)-, bis(trimethylphenylammonium)-, bis(ethyltriphenylphosphonium)-, bis(benzyltriphenylphosphonium)-, and bis(tetraphenylarsonium) tetrachloridocuprate(II) were synthesised and characterised by elemental, IR, EPR and X-ray analyses. The results of the crystallographic analyses show distorted tetrahedral coordination geometry of all [CuCl4](2-) anions in the five complexes and prove that all investigated complexes are stabilised by hydrogen bonds of different intensities. Despite the use of sterically demanding ammonium, phosphonium and arsonium cations to obtain the separation of the paramagnetic Cu(II) centres for EPR spectroscopy no hyperfine structure was observed in the EPR spectra but the principal values of the electron Zeeman tensor, g(parallel to) and g(perpendicular to), could be determined. With these EPR data and the crystallographic parameters we were able to carry out a correlation study to anticipate the structural situation of tetrachloridocuprates in different physical states. This correlation is in good agreement with DFT calculations.
New journal of chemistry
10.1039/c3nj01039b
1144-0546
1369-9261
wos:2014
WOS:000331805000023
Strauch, P (reprint author), Univ Potsdam, Inst Chem, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany., pstrauch@uni-potsdam.de
Alette Winter
Kerstin Thiel
Andre Zabel
Tillmann Klamroth
Andreas Poeppl
Alexandra Kelling
Uwe Schilde
Andreas Taubert
Peter Strauch
Institut für Chemie
Referiert
61531
2022
2022
eng
13
64
28
article
Wiley-VCH
Weinheim
1
2022-07-05
2022-07-05
--
Tetrahalidometallate(II) ionic liquids with more than one metal
Fifteen N-butylpyridinium salts - five monometallic [C4Py](2)[MBr4] and ten bimetallic [C4Py](2)[(M0.5M0.5Br4)-M-a-Br-b] (M=Co, Cu, Mn, Ni, Zn) - were synthesized, and their structures and thermal and electrochemical properties were studied. All the compounds are ionic liquids (ILs) with melting points between 64 and 101 degrees C. Powder and single-crystal X-ray diffraction show that all ILs are isostructural. The electrochemical stability windows of the ILs are between 2 and 3 V. The conductivities at room temperature are between 10(-5) and 10(-6) S cm(-1). At elevated temperatures, the conductivities reach up to 10(-4) S cm(-1) at 70 degrees C. The structures and properties of the current bromide-based ILs were also compared with those of previous examples using chloride ligands, which illustrated differences and similarities between the two groups of ILs.
Chemistry - a European journal
the effect of bromide versus chloride
10.1002/chem.202201068
35789121
1521-3765
outputup:dataSource:PubMed:2022
e202201068
WOS:000853912200001
Taubert, A (corresponding author), Univ Potsdam, Inst Chem, D-14476 Potsdam, Germany., ataubert@uni-potsdam.de
University of Potsdam [53170000]; Deutsche Forschungsgemeinschaft [DFG; SPP 1708, KO4876/1-1, KO4876/1-2, TA571/13-1, TA571/13-2]; Projekt DEAL
Taubert, Andreas
2023-11-23T07:45:26+00:00
sword
importub
filename=package.tar
0f352bd18137c05a42a4783056c9b0f4
1478547-X
false
true
CC-BY - Namensnennung 4.0 International
Christian Balischewski
Biswajit Bhattacharyya
Eric Sperlich
Christina Günter
Alkit Beqiraj
Tillmann Klamroth
Karsten Behrens
Stefan Mies
Alexandra Kelling
Susanne Lubahn
Lea Holtzheimer
Anne Nitschke
Andreas Taubert
eng
uncontrolled
electrochemistry
eng
uncontrolled
ionic liquids
eng
uncontrolled
metal-containing ionic liquids;
eng
uncontrolled
N-butylpyridinium bromide
eng
uncontrolled
tetrahalidometallates
Chemie und zugeordnete Wissenschaften
Institut für Chemie
Institut für Geowissenschaften
Referiert
Import
Hybrid Open-Access
9501
2013
2013
eng
1019
1030
postprint
1
--
2013-11-29
--
Tetrahalidocuprates(II) – structure and EPR spectroscopy
We present and discuss the results of crystallographic and electron paramagnetic resonance (EPR) spectroscopic analyses of five tetrachloridocuprate(II) complexes to supply a useful tool for the structural characterisation of the [CuCl4]2− moiety in the liquid state, for example in ionic liquids, or in solution. Bis(benzyltriethylammonium)-, bis(trimethylphenylammonium)-, bis(ethyltriphenylphosphonium)-, bis(benzyltriphenylphosphonium)-, and bis(tetraphenylarsonium)tetrachloridocuprate(II) were synthesised and characterised by elemental, IR, EPR and X-ray analyses. The results of the crystallographic analyses show distorted tetrahedral coordination geometry of all [CuCl4]2− anions in the five complexes and prove that all investigated complexes are stabilised by hydrogen bonds of different intensities. Despite the use of sterically demanding ammonium, phosphonium and arsonium cations to obtain the separation of the paramagnetic Cu(II) centres for EPR spectroscopy no hyperfine structure was observed in the EPR spectra but the principal values of the electron Zeeman tensor, g∥ and g⊥, could be determined. With these EPR data and the crystallographic parameters we were able to carry out a correlation study to anticipate the structural situation of tetrachloridocuprates in different physical states. This correlation is in good agreement with DFT calculations.
Part 2: tetrachloridocuprates(II)
urn:nbn:de:kobv:517-opus4-95012
online registration
New J. Chem. (2014) Nr. 38, S. 1019-1030. - DOI: 10.1039/C3NJ01039B
Keine öffentliche Lizenz: Unter Urheberrechtsschutz
Alette Winter
Kerstin Thiel
André Zabel
Tillmann Klamroth
Andreas Pöppl
Alexandra Kelling
Uwe Schilde
Andreas Taubert
Peter Strauch
Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
240
eng
uncontrolled
electron-spin resonance
eng
uncontrolled
liquid-crystal precursors
eng
uncontrolled
copper(II) halide salts
eng
uncontrolled
ionic liquid
eng
uncontrolled
square planar
eng
uncontrolled
tetrachlorocuprate(II) salts
eng
uncontrolled
molecular-structure
eng
uncontrolled
magnetic-properties
eng
uncontrolled
paramagnetic-resonance
eng
uncontrolled
temperature phase
Chemie und zugeordnete Wissenschaften
open_access
Institut für Chemie
Referiert
Open Access
Universität Potsdam
https://publishup.uni-potsdam.de/files/9501/pmnr240_online.pdf