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Eggenstein-Leopoldshafen, Germany
Eggenstein-Leopoldshafen, Germany

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Piras E.,IKFT | Piras E.,ETH Zurich | Powietzka B.,IKFT | Wurst F.,IKFT | And 5 more authors.
Catalysis Letters | Year: 2013

The phoszone ligand [(Ph2P)(bis-3,5-CF3-Ph)]NN= CH(penta-fluoro-Ph) transformed in liquid CO2 at room temperature in presence of [Rh(cod)2]OTf into [Rh(cod)(η2-P,P′- Ph2POPPh2)]OTf. Replacing the O-atom in Ph 2POPPh2 by a PrN-group leads to the ligand PrN(PPh 2)2 acting similarly as a bidentate ligand in [Rh(cod)(η2-P,P′-PrN(PPh2)2)]OTf. Hydroformylation of 1-octene with in situ catalysts formed by the ligands with [Rh(cod)2]OTf showed hydroformylation activities at 50 % conversion of 16,000 h-1 (PrN(PPh2)2/[Rh(cod) 2]OTf) and 24,000 h-1 (phoszone/[Rh(cod)2]OTf), respectively. © 2013 Springer Science+Business Media New York.


Fuchs M.,IKFT | Zevaco T.,IKFT | Dinjus E.,IKFT | Walter O.,IKFT | Walter O.,European Commission
Acta Crystallographica Section E: Structure Reports Online | Year: 2014

The slightly yellow-coloured title complex, [Zn(C18H 16N4O4)(H2O)]n, crystallizes with one molecule in the asymmetric unit. The structure clearly shows the mer-η4O,O,N,N-binding mode of the N,N′-bis-(2- cyano-ethylpropenoyl)-1,2-diamidobenzene ligand stabilizing the Zn centre of a distorted octahedral environment. The fifth coordination site in one apical position is held by a coordinating solvent water molecule whereas the complete octahedral coordination sphere is completed by coordination of one N atom from a CN group of a neighbouring molecule, leading to the final polymeric structure consisting of zigzag staggered chains in parallel orientation along the c-axis direction. Between the coordinated water solvent molecule and the N atoms of uncoordinated cyano-groups of neighboured units, two H-bridge bonds are formed. One of these H-bridge bonds is of inter-whereas the other of intra-strand nature, leading to a two-dimensional network parallel to (110) stabilizing the supramolecular structure. Six Zn - O or Zn - N bonds are found with lengths ranging from 2.061(1) to 2.185(1)Å and bond angles about the Zn atom are clustered in the ranges 79.83(4)-104.21(4) and 167.05(4)-170.28(4)°. © 2014 CrossMark.


Apostolidis C.,European Commission | Ahlmann M.,IKFT | Walter O.,IKFT
Acta Crystallographica Section E: Structure Reports Online | Year: 2012

The structure of the title complex, [ReBr(C13H 19OP)(CO)3], displays a facial coordination of the three CO ligands and a κ2 O,P coordination mode of the 2-diisopropyl-phosphino-benzaldehyde ligands. The Re - C bond distance for the CO ligand trans to the P atom is, due to its trans influence, elongated to 1.943 (3) Å, showing that this CO ligand is more weakly bound to the Re centre than the other two.


Deutsch D.,IKFT | Zevaco T.,IKFT | Walter O.,IKFT
Acta Crystallographica Section E: Structure Reports Online | Year: 2013

The colourless title complex, [Zn2(C10H 11O5)4 (C2H6OS) 2], crystallizes with one half-molecule in the asymmetric unit, the other half of the molecule being generated by a crystallographic inversion center. The structure shows a μ2-O:O'-bridging mode of the four 3,4,5-trimethoxybenzoate ligands finally stabilizing the two ZnII atoms in the dinuclear complex in a distorted square-pyramidal environment. The fifth coordination site in the apical position of the pyramid is occupied by a coordinating dimethyl sulfoxide solvent molecule equally disordered over two positions. © 2013 Deutsch et al.


Walter O.,IKFT
Acta Crystallographica Section E: Structure Reports Online | Year: 2013

The title compound, C12H20N2O4, represents one example of a zwitterionic imidazolium salt with a carboxylate group at the 2-position of the imidazolium ring. The dihedral angle between the heterocyclic ring and the carboxylate group is 31.3(1)°. The side chain linking the N atom of the ring and the methine C atom has a gauche-anti-anti conformation [torsion angles = -60.3(2), -175.7(2) and 178.7(2)°, respectively]. In the crystal, molecules are linked by short C - H⋯O hydrogen bonds involving the C - H groups in the aromatic ring to generate (001) sheets.

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