Alkyl Alkyne Mono((trimethylsilyl)cyclopentadienyl) Niobium Complexes. Synthesis and Chemical Behavior in Insertion Processes. X-ray Crystal Structures of [NbCp‘(CH2SiMe3)2(Me3SiCCSiMe3)] and [NbCp‘(NAr){η4-CH(SiMe3)C(SiMe3)C(CH2SiMe3)CH(SiMe3)}], (Cp‘ = η5-C5H4SiMe3, Ar = 2,6-Me2C6H3). DFT Studies of the Model Complexes [Nb(η5-C5H5)R2(HCCH)] (R = Cl, Me)

2002 ◽  
Vol 21 (2) ◽  
pp. 293-304 ◽  
Author(s):  
Agustín Galindo ◽  
Manuel Gómez ◽  
Pilar Gómez-Sal ◽  
Avelino Martín ◽  
Diego del Río ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Dft Studies ◽  
Chemical Behavior ◽  
Model Complexes ◽  
X Ray ◽  
Niobium Complexes

Heterometallic niobium complexes containing the CpNb unit. X-ray crystal structures of CpNbCl2(.mu.-SEt)2NiCp and CpNb(PhCCPh)(.mu.-SPr-iso)2Mo(CO)4

1992 ◽  
Vol 11 (6) ◽  
pp. 2140-2146 ◽  
Author(s):  
Simon Woodward ◽  
M. David Curtis ◽  
Arnold L. Rheingold ◽  
Brian S. Haggerty
Keyword(s):  
Crystal Structures ◽  
X Ray ◽  
Niobium Complexes

Heteroleptic Ru(II) complexes containing aroyl hydrazone and 2,2′-bipyridyl: Synthesis, X-ray crystal structures, electrochemical and DFT studies

Polyhedron ◽  
2014 ◽  
Vol 72 ◽  
pp. 115-121 ◽  
Author(s):  
Bipinbihari Ghosh ◽  
Sumita Naskar ◽  
Subhendu Naskar ◽  
Arturo Espinosa ◽  
Sam C.K. Hau ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Dft Studies ◽  
X Ray

scholarly journals Bioanorganische Modellkomplexe für Metalloproteine des Eisen(III): Synthese, Kristallstrukturen und Magnetismus der zweikernigen Komplexe [L2Fe2III(µ-O)(μ-SO4)2] · 3 H2O und [L2Fe2III(μ-O)(μ-SO3)2] · 5/3 NaClO4 · (H2O)3.67 (L = N,N′N″-Trimethyl-1,4,7-triazacyclononan) / Bioinorganic Model Complexes for Metalloproteins of Iron(III): Syntheses, Crystal Structures, and Magnetism of the Binuclear Complexes [L2Fe2III(μ-O)(μ-SO4)2]·3 Η2O and [L2Fe2III(μ-O)(μ-SO3)2] · 5/3 NaClO4 · (H2O)3.67 (L = N,N′,N″-Trimethyl-1,4,7-triazacyclononane)

1989 ◽  
Vol 44 (9) ◽  
pp. 1093-1101 ◽  
Author(s):  
Karl Wieghardt ◽  
Stefan Drüeke ◽  
Phalguni Chaudhuri ◽  
Ulrich Flörke ◽  
Hans-Jürgen Haupt ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Model Compound ◽  
Spin Exchange ◽  
Antiferromagnetic Coupling ◽  
Binuclear Complexes ◽  
Ferric Ions ◽  
Bridging Ligands ◽  
Model Complexes ◽  
X Ray ◽  
X Ray Crystallography

The reaction of LFeCl3 (L = N,N′,N″-trimethyl-1,4,7-triazacyclononane) with Na2SO4, Na2SO3/NaClO4, and Na2SeO3/NaClO4 in aqueous solution affords the binuclear oxo bridged complexes [L2Fe2(μ-Ο)(μ-SΟ4)2]·3Η2Ο (1), [L2Fe2(μ-O)(μ-SO3)2]·5/3NaClO4·(H2O)3.67 (2), [L2Fe2(μ-O)(μ-SeO3)2](NaClO4)2.75·5H2O (3). The reaction of LFeCl3 in dry methanol with Na2SO4 yields yellow crystals of [L2Fe2(μ-SO4)3] · 2 H2O (4). The crystal structures of 1 and 2 have been determined by X-ray crystallography. Crystals of 1, 2, and 3 consist of neutral, binuclear μ-oxo bridged diiron(III) complexes which contain two additional O,O′-coordinated sulfato, sulfito, and selenito bridging ligands, respectively. The high spin ferric ions in 1, 2, and 3 are strongly intramolecularly antiferromagnetically spin exchange coupled with J values of —97(1), -104(2), and —104(2) cm-1 (H = —2JŜ,·Ŝ2, S1 = S2 = 5/2), respectively. 4 contains three μ-sulfato bridges between two FeIII ions. Only a very weak antiferromagnetic coupling has been detected (J = —5.5(5) cm-1). Complex 1 serves as a model compound for the diiron(III) complex of the sulfate treated, oxidized form of the biomolecule uteroferrin.

Ruthenium(II/III) complexes of redox non-innocent bis(thiosemicarbazone) ligands: Synthesis, X-ray crystal structures, electrochemical, DNA binding and DFT studies

Polyhedron ◽  
2017 ◽  
Vol 131 ◽  
pp. 74-85 ◽  
Author(s):  
Bipinbihari Ghosh ◽  
Piyali Adak ◽  
Subhendu Naskar ◽  
Bholanath Pakhira ◽  
Partha Mitra ◽  
...  
Keyword(s):  
Dna Binding ◽  
Crystal Structures ◽  
Dft Studies ◽  
X Ray

Ruthenium(II) complexes of thiosemicarbazones: Synthesis, X-ray crystal structures, spectroscopy, electrochemistry, DFT studies and fluoride sensing properties

2017 ◽  
Vol 459 ◽  
pp. 1-14 ◽  
Author(s):  
Bipinbihari Ghosh ◽  
Piyali Adak ◽  
Subhendu Naskar ◽  
Bholanath Pakhira ◽  
Partha Mitra ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Dft Studies ◽  
X Ray ◽  
Sensing Properties ◽  
Fluoride Sensing

Merocyanine dyes containing an isoxazolone nucleus: Synthesis, X-ray crystal structures, spectroscopic properties and DFT studies

2012 ◽  
Vol 93 (1-3) ◽  
pp. 1408-1415 ◽  
Author(s):  
Xiang-Han Zhang ◽  
Yong-Hua Zhan ◽  
Dan Chen ◽  
Fu Wang ◽  
Lan-Ying Wang
Keyword(s):  
Crystal Structures ◽  
Spectroscopic Properties ◽  
Dft Studies ◽  
X Ray ◽  
Merocyanine Dyes

Naphthoquinone based Chemosensor 2-(2′-aminoethylpyridine)-3-chloro-1,4-naphthoquinone: Detection of metal ions, X-ray -crystal structures and DFT studies

2016 ◽  
Vol 1114 ◽  
pp. 132-143 ◽  
Author(s):  
Amit Patil ◽  
Anuja P. Ware ◽  
Sujit Bhand ◽  
Debamitra Chakrovarty ◽  
Rajesh Gonnade ◽  
...  
Keyword(s):  
Metal Ions ◽  
Crystal Structures ◽  
Dft Studies ◽  
X Ray

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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