0000000001303194
AUTHOR
Roland Krämer
Coordination Diversity in Mono- and Oligonuclear Copper(II) Complexes of Pyridine-2-Hydroxamic and Pyridine-2,6-Dihydroxamic Acids
Solution and solid state studies on Cu(II) complexes of pyridine-2-hydroxamic acid (HPicHA) and pyridine-2,6-dihydroxamic acid (H2PyDHA) were carried out. The use of methanol/water solvent allowed us to investigate the Cu(II)-HPicHA equilibria under homogeneous conditions between pH 1 and 11. In agreement with ESI-MS indication, the potentiometric data fitted very well with the model usually reported for copper(II) complexes of α-aminohydroxamate complexes ([CuL](+), [Cu5(LH-1)4](2+), [CuL2], [CuL2H-1](-)), however with much higher stability of the 12-MC-4 species. A series of copper(II) complexes has been isolated in the solid state and characterized by a variety of spectroscopic methods, …
Bis(3,5-dimethyl-1H-pyrazolyl)selenide--a new bidentate bent connector for preparation of 1D and 2D co-ordination polymers.
The synthesis and description of eight polymeric complexes formed by transition metals with the bifurcated ligand bis(3,5-dimethyl-1H-pyrazolyl)selenide are discussed together with X-ray crystal analysis as well as variable temperature magnetic susceptibility and characterization by Mossbauer spectroscopy. Preferable types of binding patterns of the ligand were determined, which include a variation of the bridging modes (cis- and trans-) and of the separation length, where the latter parameter together with bending of the ligand molecule were found to be dependent on the type of co-ordination geometry of the central atom and the nature of the anion. A strategy for increasing the structure d…
New reaction of 1H-pyrazoles with selenium dioxide: one-pot synthesis of bis(1H-pyrazol-4-yl)selenides
Abstract A novel reaction between 3- and 3,5-substituted pyrazoles with selenium dioxide proceeds with formation of bis(3R,5R′-1H-pyrazol-4-yl)selenides in high yield. On this basis, an efficient one-pot synthetic procedure has been developed. In the case of the unsubstituted pyrazole a selenonium compound has been obtained. The identity and structure of the isolated selenium derivatives have been confirmed by spectral methods and their molecular structures investigated by X-ray analysis.
CCDC 867361: Experimental Crystal Structure Determination
Related Article: Elzbieta Gumienna-Kontecka, Irina A. Golenya, Agnieszka Szebesczyk, Matti Haukka, Roland Krämer, and Igor O. Fritsky|2013|Inorg.Chem.|52|7633|doi:10.1021/ic4007229
CCDC 867362: Experimental Crystal Structure Determination
Related Article: Elzbieta Gumienna-Kontecka, Irina A. Golenya, Agnieszka Szebesczyk, Matti Haukka, Roland Krämer, and Igor O. Fritsky|2013|Inorg.Chem.|52|7633|doi:10.1021/ic4007229
CCDC 867363: Experimental Crystal Structure Determination
Related Article: Elzbieta Gumienna-Kontecka, Irina A. Golenya, Agnieszka Szebesczyk, Matti Haukka, Roland Krämer, and Igor O. Fritsky|2013|Inorg.Chem.|52|7633|doi:10.1021/ic4007229