Synthesis, structure, and reactivity of Group 4 metallocene tellurolates. X-ray crystal structures of Cp2Zr[TeSi(SiMe3)3]2, Cp'2Ti[TeSi(SiMe3)3]2, Cp2Zr(.eta.2-COMe)[TeSi(SiMe3)3], and Cp2Ti[TeSi(SiMe3)3]PMe3

1993 ◽  
Vol 115 (23) ◽  
pp. 10545-10552 ◽  
Author(s):  
Victor Christou ◽  
Stephen P. Wuller ◽  
John Arnold
Keyword(s):  
Crystal Structures ◽  
X Ray ◽  
Group 4

Triphenylsilanolato complexes of Group 4 metals: syntheses, X-ray crystal structures and catalytic cyclization reaction of 1,5-hexadiene

1999 ◽  
Vol 286 (1) ◽  
pp. 14-23 ◽  
Author(s):  
Bernd Schweder ◽  
Helmar Görls ◽  
Dirk Walther
Keyword(s):  
Crystal Structures ◽  
Cyclization Reaction ◽  
X Ray ◽  
Group 4 ◽  
Catalytic Cyclization ◽  
Group 4 Metals

scholarly journals Macrocycles containing 1,1′-ferrocenyldiselenolato ligands on group 4 metallocenes

2018 ◽  
Vol 47 (15) ◽  
pp. 5415-5421 ◽  
Author(s):  
Clara Sanchez-Perez ◽  
Caroline E. Knapp ◽  
Minna M. Karjalainen ◽  
Raija Oilunkaniemi ◽  
Claire J. Carmalt ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Single Crystal ◽  
Crystal Structures ◽  
X Ray Diffraction ◽  
X Ray ◽  
Group 4

Macrocyclic [Fe(η5-C5H4Se)2M(η5-C5H4R)2]2 [M = Ti (1), Zr (2), Hf (3), R = H; and M = Zr (4), Hf (5), R = tBu] were prepared and characterized by 77Se NMR spectroscopy and the crystal structures of 1–3 and 5 were determined by single-crystal X-ray diffraction.

Group 4 metallocene complexes incorporating vinyl or allyl substituted ansa ligands. X-Ray crystal structures of [Zr{Me(CH2CH)Si(η5-C5Me4)2}Cl2], [Zr{Me(CH2CHCH2)Si(η5-C5H4)2}Cl2] and [Zr{Me(CH2CHCH2)Si(η5-C5Me4)(η5-C5H4)}Cl2]

2003 ◽  
Vol 683 (1) ◽  
pp. 11-22 ◽  
Author(s):  
Antonio Antiñolo ◽  
Mariano Fajardo ◽  
Santiago Gómez-Ruiz ◽  
Isabel López-Solera ◽  
Antonio Otero ◽  
...  
Keyword(s):  
Crystal Structures ◽  
X Ray ◽  
Group 4 ◽  
Metallocene Complexes

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>

Avoiding and detecting errors in X-ray crystal structures of small molecules

2004 ◽  
Vol 60 (a1) ◽  
pp. s78-s78
Author(s):  
M. Lutz ◽  
A. L. Spek
Keyword(s):  
Small Molecules ◽  
Crystal Structures ◽  
X Ray
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