scholarly journals Chiral bisoxazoline ligands designed to stabilize bimetallic complexes

2018 ◽  
Vol 14 ◽  
pp. 2002-2011 ◽  
Author(s):  
Deepankar Das ◽  
Rudrajit Mal ◽  
Nisha Mittal ◽  
Zhengbo Zhu ◽  
Thomas J Emge ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Metal Salts ◽  
Bimetallic Complexes ◽  
X Ray

Chiral bisoxazoline ligands containing naphthyridine, pyridazine, pyrazole, and phenol bridging units were prepared and shown to form bimetallic complexes with various metal salts. X-ray crystal structures of bis-nickel naphthyridine-bridged, bis-zinc pyridazine-bridged, and bis-nickel as well as bis-palladium pyrazole-bridged complexes were obtained.

Crystal structures of the trifluoromethyl sulfonates M(SO3CF3)2 (M = Mg, Ca, Ba, Zn, Cu) from synchrotron X-ray powder diffraction data

2006 ◽  
Vol 62 (3) ◽  
pp. 467-473 ◽  
Author(s):  
Robert Dinnebier ◽  
Natalia Sofina ◽  
Lars Hildebrandt ◽  
Martin Jansen
Keyword(s):  
Crystal Structures ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Metal Salts ◽  
Double Layers ◽  
Monoclinic Space Group ◽  
Powder Diffraction Data ◽  
Space Group ◽  
X Ray ◽  
Symmetry Relations

The crystal structures of divalent metal salts of trifluoromethyl sulfonic acid (`trifluoromethyl sulfonates') M(SO3CF3)2 (M = Mg, Ca, Ba, Zn, Cu) were determined from high-resolution X-ray powder diffraction data. Magnesium, calcium and zinc trifluoromethyl sulfonate crystallize in the rhombohedral space group R\bar3. Barium trifluoromethyl sulfonate crystallizes in the monoclinic space group I2/a(C2/c) and copper trifluoromethyl sulfonate crystallizes in the triclinic group P\bar1. Within the crystal structures the trifluoromethyl sulfonate anions are arranged in double layers with the apolar CF3 groups pointing towards each other. The cations are located next to the SO3 groups. The symmetry relations between the different crystal structures have been analysed.

scholarly journals Substitute Group-Tuned Schiff-Base Manganese(III)-Based Cyanide-Bridged Bimetallic Complexes: Synthesis, Crystal Structures and Magnetic Properties

2018 ◽  
Vol 42 (1) ◽  
pp. 28-32
Author(s):  
Jingwen Shi ◽  
Yin Zhou ◽  
Chongchong Xue ◽  
Qingyun Liu ◽  
Daopeng Zhang
Keyword(s):  
Magnetic Properties ◽  
Schiff Base ◽  
Crystal Structures ◽  
Bimetallic Complexes ◽  
X Ray Diffraction ◽  
Magnetic Susceptibilities ◽  
X Ray

The trinuclear cyanide-bridged heterometallic Pd(II)–Mn(III) complexes {[Mn(L1)(H2O)]2[Pd(CN)4]} and {[Mn(L2)(H2O)]2[Pd(CN)4]}·2H2O (L1 = N,N‘-1,2-propylene-bis(3-methoxysalicylideneiminate; L2 = N,N′-1,2-propylene-bis(3-ethoxysalicylideneiminate) were obtained and structurally and magnetically characterised. X-ray diffraction revealed their cyanide-bridged trinuclear core nature with a conformational difference. The magnetic susceptibilities of the two complexes revealed overall weak antiferromagnetic interactions between the adjacent Mn(III) ions.

scholarly journals Metallkomplexe von 2,2’-Dipyridyldisulfid mit Quecksilber(II)-, Cadmium(II)- und Zink(II)-Halogeniden und mit Cadmium(II)- Trifluormethansulfonat / Metal Complexes of 2,2’-Dipyridyldisulfide with Mercury(II), Cadmium(II), and Zinc(II) Halides and with Cadmium(II) Trifluoromethanesulfonate

2005 ◽  
Vol 60 (4) ◽  
pp. 373-376 ◽  
Author(s):  
Joachim Pickardt ◽  
Lars von Chrzanowski ◽  
Ralf Steudel ◽  
Marina Borowski ◽  
Sebastian Beck
Keyword(s):  
Metal Complexes ◽  
Crystal Structures ◽  
Metal Salts ◽  
X Ray

Crystals of diiodo-2,2’-dipyridyldisulfide mercury(II) [HgI2(C5H4N)2S2], dichloro-2,2’-dipyridyldisulfide zinc(II) [ZnCl2(C5H4N)2S2], dibromo-2,2’-dipyridyldisulfide cadmium(II) [CdBr2 (C5H4N)2S2], diiodo-2,2’-dipyridyldisulfide cadmium(II) [CdI2(C5H4N)2S2], and diaquo 2,2’-dipyridyldisulfide cadmium(II) trifluoromethanesulfonate [Cd(H2O)2(C5H4N)2S2](CF3SO3)2, were obtained by evaporation of solutions of the ligand and the appropriate metal salts, and their X-ray crystal structures determined

Thiakronenether-Metallkomplexe: Komplexe von Silber(I) und Quecksilber(II) mit Tetrathia-12-krone-4, Silber(I) und Cadmium(II) mit Hexathia-18-krone-6 und Silber(I) mit 3,6,9,14-Tetrathiabicyclo[9.2.1]tetradeca-11-13-dien / Thia Crown Ether Metal Complexes: Complexes of Silver(I) and Mercury(II) with Tetrathia-12-crown-4, Silver(I), and Cadmium(II) with Hexathia-18-crown-6, and Silver(I) with 3,6,9,14-Tetrathiabicyclo[9.2.1]tetradeca-11-13-diene

2004 ◽  
Vol 59 (10) ◽  
pp. 1077-1082 ◽  
Author(s):  
Joachim Pickardt ◽  
Lars von Chrzanowski ◽  
Ralf Steudel ◽  
Marina Borowski
Keyword(s):  
Crown Ether ◽  
Metal Complexes ◽  
Crystal Structures ◽  
Methylene Chloride ◽  
Metal Salts ◽  
X Ray

Abstract Crystals of 1,4,7,10-tetrathiacyclododecane silver(I) trifluoromethanesulfonate, Ag(C8H16S4)- (CF3SO3), 1,4,7,10-tetrathiacyclododecane iodo mercury(II) hexaiododimercurate(II)methylene chloride [HgI(C8H16S4)][Hg2I6] · CH2Cl2, 1,4,7,10,13,16-hexathiacyclooctadecane silver(I) trifluoromethanesulfonate [Ag(C12H24S6)](CF3SO3), 1,4,7,10,13,16-hexathiacyclooctadecane diiodocadmium, [Cd(C12H24S6)I2], and bis-3,6,9,14-tetrathiabicyclo[9.2.1]tetradeca-11-13-diene silver(I) trifluoromethanesulfonate [Ag(C10H14S4)2](CF3SO3) were obtained by reaction of solutions of the ligands and the appropriate metal salts and their X-ray crystal structures determined.

Transmission electron microscope studies in special ceramics

1978 ◽  
Vol 36 (1) ◽  
pp. 268-269
Author(s):  
A. Zangvil ◽  
L.J. Gauckler ◽  
G. Schneider ◽  
M. Rühle
Keyword(s):  
Phase Diagrams ◽  
Crystal Structures ◽  
Thin Foil ◽  
Limited Extent ◽  
Complex Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Electron Microscopes ◽  
Lattice Resolution

The use of high temperature special ceramics which are usually complex materials based on oxides, nitrides, carbides and borides of silicon and aluminum, is critically dependent on their thermomechanical and other physical properties. The investigations of the phase diagrams, crystal structures and microstructural features are essential for better understanding of the macro-properties. Phase diagrams and crystal structures have been studied mainly by X-ray diffraction (XRD). Transmission electron microscopy (TEM) has contributed to this field to a very limited extent; it has been used more extensively in the study of microstructure, phase transformations and lattice defects. Often only TEM can give solutions to numerous problems in the above fields, since the various phases exist in extremely fine grains and subgrain structures; single crystals of appreciable size are often not available. Examples with some of our experimental results from two multicomponent systems are presented here. The standard ion thinning technique was used for the preparation of thin foil samples, which were then investigated with JEOL 200A and Siemens ELMISKOP 102 (for the lattice resolution work) electron microscopes.

Crystal Structures of Fragments D and Double-D from Fibrinogen and Fibrin

1999 ◽  
Vol 82 (08) ◽  
pp. 271-276 ◽  
Author(s):  
Glen Spraggon ◽  
Stephen Everse ◽  
Russell Doolittle
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Crystal Structures ◽  
Structure And Function ◽  
X Ray ◽  
Long Period ◽  
And Function

IntroductionAfter a long period of anticipation,1 the last two years have witnessed the first high-resolution x-ray structures of fragments from fibrinogen and fibrin.2-7 The results confirmed many aspects of fibrinogen structure and function that had previously been inferred from electron microscopy and biochemistry and revealed some unexpected features. Several matters have remained stubbornly unsettled, however, and much more work remains to be done. Here, we review several of the most significant findings that have accompanied the new x-ray structures and discuss some of the problems of the fibrinogen-fibrin conversion that remain unresolved. * Abbreviations: GPR—Gly-Pro-Arg-derivatives; GPRPam—Gly-Pro-Arg-Pro-amide; GHRPam—Gly-His-Arg-Pro-amide

Synthesis of Sulfoquinovose and Sulfoquinovosyl Diacylglycerides, and a Fluorogenic Substrate for Sulfoquinovosidases

2019 ◽  
Author(s):  
Yunyang Zhang ◽  
Janice Mui ◽  
Thimali Arumaperuma ◽  
James P. Lingford ◽  
ETHAN GODDARD-BORGER ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Fluorogenic Substrate ◽  
Potassium Salts ◽  
X Ray ◽  
Sulfoquinovosyl Diacylglycerol ◽  
Sodium And Potassium

<p>The sulfolipid sulfoquinovosyl diacylglycerol (SQDG) and its headgroup, the sulfosugar sulfoquinovose (SQ), are estimated to harbour up to half of all organosulfur in the biosphere. SQ is liberated from SQDG and related glycosides by the action of sulfoquinovosidases (SQases). We report a 10-step synthesis of SQDG that we apply to the preparation of saturated and unsaturated lipoforms. We also report an expeditious synthesis of SQ and (<sup>13</sup>C<sub>6</sub>)SQ, and X-ray crystal structures of sodium and potassium salts of SQ. Finally, we report the synthesis of a fluorogenic SQase substrate, methylumbelliferyl a-D-sulfoquinovoside, and examination of its cleavage kinetics by two recombinant SQases.</p>

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