scholarly journals Solid-State NMR Spectroscopic Study of Coordination Compounds of XeF2 with Metal Cations and the Crystal Structure of [Ba(XeF2)5][AsF6]2.

ChemInform ◽  
2007 ◽  
Vol 38 (38) ◽  
Author(s):  
Michael Gerken ◽  
Paul Hazendonk ◽  
Adriana Iuga ◽  
Jared Nieboer ◽  
Melita Tramsek ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Spectroscopic Study ◽  
Solid State Nmr ◽  
Coordination Compounds ◽  
Metal Cations

Solid-State NMR Spectroscopic Study of Coordination Compounds of XeF2with Metal Cations and the Crystal Structure of [Ba(XeF2)5][AsF6]2‖

2007 ◽  
Vol 46 (15) ◽  
pp. 6069-6077 ◽  
Author(s):  
Michael Gerken ◽  
Paul Hazendonk ◽  
Adriana Iuga ◽  
Jared Nieboer ◽  
Melita Tramšek ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Spectroscopic Study ◽  
Solid State Nmr ◽  
Coordination Compounds ◽  
Metal Cations

scholarly journals MAS NMR on a Red/Far-Red Photochromic Cyanobacteriochrome All2699 from Nostoc

2019 ◽  
Vol 20 (15) ◽  
pp. 3656 ◽  
Author(s):  
Qian-Zhao Xu ◽  
Pavlo Bielytskyi ◽  
James Otis ◽  
Christina Lang ◽  
Jon Hughes ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Spectroscopic Study ◽  
Protein Interactions ◽  
Solid State Nmr ◽  
Structural Model ◽  
Site Directed Mutagenesis ◽  
Directed Mutagenesis ◽  
Dark State ◽  
Stabilizing Element

Unlike canonical phytochromes, the GAF domain of cyanobacteriochromes (CBCRs) can bind bilins autonomously and is sufficient for functional photocycles. Despite the astonishing spectral diversity of CBCRs, the GAF1 domain of the three-GAF-domain photoreceptor all2699 from the cyanobacterium Nostoc 7120 is the only CBCR-GAF known that converts from a red-absorbing (Pr) dark state to a far-red-absorbing (Pfr) photoproduct, analogous to the more conservative phytochromes. Here we report a solid-state NMR spectroscopic study of all2699g1 in its Pr state. Conclusive NMR evidence unveils a particular stereochemical heterogeneity at the tetrahedral C31 atom, whereas the crystal structure shows exclusively the R-stereochemistry at this chiral center. Additional NMR experiments were performed on a construct comprising the GAF1 and GAF2 domains of all2699, showing a greater precision in the chromophore–protein interactions in the GAF1-2 construct. A 3D Pr structural model of the all2699g1-2 construct predicts a tongue-like region extending from the GAF2 domain (akin to canonical phytochromes) in the direction of the chromophore, shielding it from the solvent. In addition, this stabilizing element allows exclusively the R-stereochemistry for the chromophore-protein linkage. Site-directed mutagenesis performed on three conserved motifs in the hairpin-like tip confirms the interaction of the tongue region with the GAF1-bound chromophore.

Influence of Alkali Metal Cations on the Photodimerization of Bromo Cinnamates Studied by Solid-State NMR

2020 ◽  
Vol 124 (50) ◽  
pp. 27614-27620
Author(s):  
Marufa Zahan ◽  
He Sun ◽  
Sophia E. Hayes ◽  
Harald Krautscheid ◽  
Jürgen Haase ◽  
...  
Keyword(s):  
Solid State ◽  
Alkali Metal ◽  
Solid State Nmr ◽  
Metal Cations ◽  
Alkali Metal Cations

Formation of di- and polynuclear Mn(II) thiocyanate pyrazole complexes in solution and in the solid state

2018 ◽  
Vol 73 (11) ◽  
pp. 793-801
Author(s):  
Aleksej Jochim ◽  
Christian Näther
Keyword(s):  
Solid State ◽  
Coordination Compounds ◽  
Magnetic Measurements ◽  
Metal Cations ◽  
Chain Compound ◽  
Pyrazole Ligands

AbstractReaction of Mn(NCS)2with pyrazole leads to the formation of three compounds with the compositions Mn(NCS)2(pyrazole)4(1), [Mn(NCS)2]2(pyrazole)6(2) and Mn(NCS)2(pyrazole)2(3). Compound1, already reported in the literature, consists of discrete complexes, in which the Mn(II) cations are octahedrally coordinated by four pyrazole ligands and two terminally N-bonded thiocyanate anions. In compound2each of the two Mn(II) cations are coordinated octahedrally by three pyrazole ligands and one terminal as well as two bridging thiocyanate anions, which link the metal cations into dimers. In compound3also octahedrally coordinated Mn(II) cations are present but they are linked into chainsviacentrosymmetric pairs ofμ-1,3-bridging thiocyanate anions. Upon heating compound1loses the pyrazole co-ligands stepwise and is transformed into the chain compound3viathe dimer2that is formed as an intermediate. Magnetic measurements on compounds2and3reveal dominating antiferromagnetic interactions, as already observed for 1D Mn(NCS)2coordination compounds with pyridine based co-ligands.

The potential for the indirect crystal structure verification of methyl glycosides based on acetates’ parent structures: GIPAW and solid-state NMR approaches

2017 ◽  
Vol 686 ◽  
pp. 7-11 ◽  
Author(s):  
Łukasz Szeleszczuk ◽  
Tomasz Gubica ◽  
Andrzej Zimniak ◽  
Dariusz M. Pisklak ◽  
Kinga Dąbrowska ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Solid State Nmr

scholarly journals Crystal structure and tautomerism of Pigment Yellow 138 determined by X-ray powder diffraction and solid-state NMR

2016 ◽  
Vol 131 ◽  
pp. 364-372 ◽  
Author(s):  
Silke D. Gumbert ◽  
Meike Körbitzer ◽  
Edith Alig ◽  
Martin U. Schmidt ◽  
Michele R. Chierotti ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Powder Diffraction ◽  
Solid State Nmr ◽  
X Ray
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