TY  - JOUR
A1  - Sperlich, Eric
A1  - Köckerling, Martin
T1  - [Nb6Cl12(CH3OH)4(OCH3)2] ⋅ DABCO ⋅ 1.66 CH2Cl2
BT  - cluster units wrapped in a network of hydrogen bonds
JF  - Zeitschrift für anorganische und allgemeine Chemie : ZAAC = Journal of inorganic and general chemistry
N2  - An easy-to-do synthesis for the hexanuclear niobium cluster compound [Nb6Cl12(CH3OH)(4)(OCH3)(2)] . DABCO . 1.66 CH2Cl2 has been developed. An one-pot reaction between the cluster precursor [Nb6Cl14(H2O)(4)] . 4H(2)O and methanol with the addition of DABCO leads to the crystallization of the title compound in high yield within a few minutes. The single-crystal X-ray structure of this cluster compound has been determined. Very strong, nearly symmetric intercluster hydrogen bonds Nb-6-MeO...H...OMe-Nb-6 are present between the cluster units. A bridging co-crystalline DABCO molecule is also involved in a three-dimensional hydrogen-bonding network.
KW  - Niobium
KW  - Cluster
KW  - Hydrogen Bonds
KW  - Synthesis
KW  - Structure Determination
Y1  - 2021
U6  - https://doi.org/10.1002/zaac.202100138
SN  - 0044-2313
SN  - 1521-3749
VL  - 647
IS  - 18
SP  - 1759
EP  - 1763
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Shainyan, Bagrat A.
A1  - Tolstikova, Ljudmila L.
A1  - Schilde, Uwe
T1  - Simple methods for the preparation of N-triflyl guanidines and the structure of compounds with the CF3SO2N=C-N fragment
JF  - Journal of fluorine chemistry
N2  - Two novel and simple approaches to N-triflyl guanidines are elaborated. Owing to very strong conjugation the formally double C=N bond of TIN=C(NHR)(2) is longer than the formally single N-C bonds. Energetic effect of the triflylgroup on the conjugation in the N-C=N moiety is estimated to be >= 150 kcal/mol.
KW  - N-triflyl guanidines
KW  - Synthesis
KW  - Structure
KW  - X-ray
KW  - MP2 calculations
Y1  - 2012
U6  - https://doi.org/10.1016/j.fluchem.2011.12.004
SN  - 0022-1139
VL  - 135
IS  - 1
SP  - 261
EP  - 264
PB  - Elsevier
CY  - Lausanne
ER  - 
TY  - JOUR
A1  - Laschewsky, André
T1  - Recent trends in the synthesis of polyelectrolytes
JF  - Current opinion in colloid & interface science : current chemistry
N2  - Recent developments in the synthesis of polyelectrolytes are highlighted, with respect to the nature of the ionic groups, the polymer backbones, synthetic methods, and additional functionality given to the polyelectrolytes. In fact, the synthesis of new polyelectrolytes is mostly driven by material aspects, currently. The article pays particular attention to strong polyelectrolytes, and the new methods of controlled polymerization. These methods and the so-called click reactions have enabled novel designs of polyelectrolytes. Nevertheless, the polymerization of unprotected ionic monomers is still challenging and limits the synthetic possibilities. The structural aspects are complemented by considerations with respect to the aspired uses of the new polyelectrolytes.
KW  - Polyelectrolytes
KW  - Synthesis
KW  - Ionic monomers
KW  - Controlled polymerization
KW  - "click" chemistry
Y1  - 2012
U6  - https://doi.org/10.1016/j.cocis.2011.08.001
SN  - 1359-0294
VL  - 17
IS  - 2
SP  - 56
EP  - 63
PB  - Elsevier
CY  - London
ER  - 
TY  - JOUR
A1  - Schwarze, Thomas
A1  - Traeger, Juliane
A1  - Kelling, Alexandra
A1  - Schilde, Uwe
A1  - Holdt, Hans-Jürgen
T1  - Macrocyclic dithiomaleonitriles for an efficient PdCl2 coordination
JF  - Inorganica chimica acta : the international inorganic chemistry journal
N2  - We have synthesized a set of new unsaturated macrocyclic dithioethers with an increasing number of flexible methylene units 1-7 (Scheme 2) to investigate the correlation between the ring size of these ligands, the chelation effect and the consequences for an efficient PdCl2 coordination. The dithioethers 1-7 and the complex [PdCl2(4)]center dot CHCl3 were characterized by X-ray diffraction analysis. The crystal structures of 1-7 show that 2-7 are better preorganized chelating ligands for an exocyclic PdCl2 coordination than 1. The chelation effect of 1-7, the orientation of the sulfur atoms and the S center dot center dot center dot S donor distances, are influenced by the flexibility of the methylene units. In this series the unsaturated macrocyclic ligands 5 and 6 are the best chelating ligands for an efficient PdCl2 coordination. Comparative solvent extraction experiments with mn-12S(2)O(2) (mn = maleonitrile) reveal that the low interface activity of the new ligands reduces the extraction rate. However, a comparison with open-chain dithiomaleonitriles shows the impact of the macrocyclic effect of 4 and 5 on the extraction yield.
KW  - Thioether ligands
KW  - Palladium
KW  - Synthesis
KW  - X-ray diffraction
KW  - Chelation effect
KW  - Extraction
Y1  - 2013
U6  - https://doi.org/10.1016/j.ica.2013.08.020
SN  - 0020-1693
SN  - 1873-3255
VL  - 408
IS  - 2
SP  - 53
EP  - 58
PB  - Elsevier
CY  - Lausanne
ER  -