cis-β-Bis(carbonyl) Ruthenium−Salen Complexes: X-ray Crystal Structures and Remarkable Catalytic Properties toward Asymmetric Intramolecular Alkene Cyclopropanation

2009 ◽  
Vol 131 (12) ◽  
pp. 4405-4417 ◽  
Author(s):  
Zhen-Jiang Xu ◽  
Ran Fang ◽  
Cunyuan Zhao ◽  
Jie-Sheng Huang ◽  
Gong-Yong Li ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Catalytic Properties ◽  
X Ray ◽  
Salen Complexes

Stable iridium(iv) complexes supported by tetradentate salen ligands. Synthesis, structures and reactivity

2019 ◽  
Vol 55 (25) ◽  
pp. 3606-3609 ◽  
Author(s):  
Chi Lun Lee ◽  
Liangliang Wu ◽  
Jie-Sheng Huang ◽  
Chi-Ming Che
Keyword(s):  
Crystal Structures ◽  
Catalytic Properties ◽  
Aryl Azides ◽  
X Ray ◽  
Salen Complexes ◽  
Salen Ligands

Here we report the synthesis, spectroscopy and X-ray crystal structures of mononuclear trans-dichloroiridium(iv)–salen complexes and their catalytic properties for intramolecular C–H amination of aryl azides.

scholarly journals Functional Perovskites: Structure-Properties Correlations

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
A.K. Bera ◽  
S.M. Yusuf
Keyword(s):  
Physical Properties ◽  
Crystal Structures ◽  
General Formula ◽  
Perovskite Structure ◽  
Large Range ◽  
Catalytic Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxide Perovskite ◽  
Structure Properties

The perovskite structure with general formula ABX3 shows its multidimensional nature in regards to correlations of crystal structures with electronic, magnetic, optical, and catalytic properties. Perovskites are utilized in a large range of applications due to their tremendous versatility. In this chapter, structure-properties correlations in oxide perovskite compounds ABO3 having several functional properties are presented. In particular, neutron and x-ray diffraction results are described to reveal a direct correlation of several important physical properties, such as magnetic, multiferroic, electronic (CMR), and SOFC electrodes with the crystal structures.

Syntheses, structures, and catalytic properties of two arene-ruthenium(II) complexes bearing N-(2-pyridinyl)aminodiphenylphosphine sulfide ligands

2018 ◽  
Vol 73 (3-4) ◽  
pp. 161-166
Author(s):  
Fule Wu ◽  
Jiling Gu ◽  
Xin Chen ◽  
Ai-Quan Jia ◽  
Qian-Feng Zhang
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Single Crystal ◽  
Crystal Structures ◽  
Catalytic Properties ◽  
Transfer Hydrogenation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sulfide Ligands

AbstractTreatment of [(arene)Ru(μ-Cl)Cl]2with Ph2P(S)NH(2-py) in the presence or absence of base gave two arene-ruthenium(II) complexes [(η6-p-cymene)Ru{κ2-N,N-Ph2P(S)N(2-py)}Cl] (1) and [(η6-benzene)Ru{κ1-N-Ph2P(S)NH(2-py)}Cl2] (2), which have been characterized by infrared, nuclear magnetic resonance spectroscopies, and mass spectrometry along with microanalyses. Crystal structures of Ph2P(S)NH(2-py) · ¼C6H14,1and2· ½CH2Cl2were determined by single-crystal X-ray diffraction. Two arene-ruthenium(II) complexes were tested as precatalysts for the transfer hydrogenation of acetophenone to give 1-phenyl ethanol.

Syntheses and Crystal Structures of Ruthenium-Salen Complexes Containing Triphenylphosphine Ligands

2011 ◽  
Vol 66 (3) ◽  
pp. 324-328 ◽  
Author(s):  
Yan Li ◽  
Qing Ma ◽  
Hua-Tian Shi ◽  
Qun Chen ◽  
Qian-Feng Zhang
Keyword(s):  
Schiff Base ◽  
Crystal Structures ◽  
Schiff Base Ligand ◽  
X Ray ◽  
X Ray Crystallography ◽  
Salen Complex ◽  
Salen Complexes ◽  
Amine Ligand

Treatment of [Ru(PPh3)3Cl2] with the Schiff base ligand H2salen in THF at reflux afforded a neutral RuIIIsalen complex [RuIII(salen)(PPh3)Cl] (1). Interaction of [RuHCl(CO)(PPh3)3] with H2salen under similar conditions gave a neutral RuII-salen complex [RuII(salen- NH)(PPh3)(CO)] (2). In its formation one of the imine bonds was nucleophilically attacked by hydride to give a mixed imine-amine ligand. The two complexes have been spectroscopically characterized, and the crystal structures of 1 · 2CH2Cl2 and 2 · CH2Cl2 have been established by X-ray crystallography.

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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