Synthesis, crystal structure and homogeneous catalytic activity towards ethylene polymerisation of the spirocyclic chromium(II) siloxane [C[graphic ommitted])-µ-Na(thf)2}2](thf = tetrahydrofuran)

1993 ◽  
pp. 1132-1133 ◽  
Author(s):  
Majid Motevalli ◽  
Mahesh Sanganee ◽  
Paul D. Savage ◽  
Syed Shah ◽  
Alice C. Sullivan
Keyword(s):  
Crystal Structure ◽  
Catalytic Activity ◽  
Ethylene Polymerisation

scholarly journals Crystal structure of a complement factor D mutant expressing enhanced catalytic activity.

1995 ◽  
Vol 270 (52) ◽  
pp. 31414
Author(s):  
Sunghee Kim ◽  
Sthanam V.L. Narayana ◽  
John E. Volanakis
Keyword(s):  
Crystal Structure ◽  
Catalytic Activity ◽  
Complement Factor

Synthesis, crystal structure and catalytic activity of some new chiral ansa-metallocenes of yttrium, lanthanum, samarium, lutetium and of zirconium

1999 ◽  
Vol 574 (2) ◽  
pp. 228-240 ◽  
Author(s):  
Herbert Schumann ◽  
Kerstin Zietzke ◽  
Roman Weimann ◽  
Jörg Demtschuk ◽  
Walter Kaminsky ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Catalytic Activity

scholarly journals Synthesis and catalytic activity of homoleptic lanthanide-tris(cyclopropylethinyl)amidinates

2015 ◽  
Vol 39 (10) ◽  
pp. 7595-7601 ◽  
Author(s):  
Farid M. Sroor ◽  
Cristian G. Hrib ◽  
Liane Hilfert ◽  
Sabine Busse ◽  
Frank T. Edelmann
Keyword(s):  
Crystal Structure ◽  
Catalytic Activity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Type C

New unsolvated, homoleptic lanthanide(iii) tris(cyclopropylethinylamidinate) complexes of the type [c-C3H5–CC–C(NR)2]3Ln (R = iPr, cyclohexyl; Ln = Nd, Sm, Ho) have been prepared and the crystal structure of the holmium derivative [c-C3H5–CC–C(NiPr)2]3Ho has been confirmed by X-ray diffraction.

Synthesis, Characterization, and Crystal Structure of Several Novel Acidic Ionic Liquids: 1-ethyl-2-alkyl-benzimidazolium Tetra-Fluoroborate

2013 ◽  
Vol 457-458 ◽  
pp. 139-143 ◽  
Author(s):  
Ming Tian Wang ◽  
Chang Ping Pan ◽  
Wei Peng Gai ◽  
Xiao Xia Lv ◽  
Min Gang Zhai ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Ionic Liquid ◽  
Acetic Acid ◽  
Catalytic Activity ◽  
Lamellar Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Acidic Ionic Liquid ◽  
Acidic Ionic Liquids ◽  
Good Catalytic Activity

A series of novel acidic ionic liquid: 1-ethyl-2-alkyl-benzimidazolium tetra-fluoroborate (alkyl= Et, Pr-n, Bu-n) were prepared by simple acid-based neutralization of 1-ethyl-2-alkyl-benzimidazole and tetrafluoroboric acid. The compounds were characterized by FTIR spectra, elemental analysis,1HNMR spectra and thermogravimetric analysis. These novel tetra-fluoroborate salts show good catalytic activity to esterification of benzyl alcohol and acetic acid. Furthermore, a crystal of ([H-ebBiBF4) was prepared with the crystal structure and determined by X-ray diffraction analysis. The molecular is of lamellar structure as mainly π electron ring is stacked interleaving between two layers. The results of cation and anion arranged orderly in pair indicate that the coulombic attraction is more dominant. Simultaneously, the weak local hydrogen bonds C-H···F exist in the molecules.

Small is different

2021 ◽  
pp. 81-93
Author(s):  
Adrian P Sutton
Keyword(s):  
Crystal Structure ◽  
Electronic Structure ◽  
Catalytic Activity ◽  
Giant Magnetoresistance ◽  
Energy Levels ◽  
Exclusion Principle ◽  
Thermodynamic Quantities ◽  
Discrete Energy ◽  
Size Dependent ◽  
The World

As the size of a material decreases to the nanoscale its properties become size-dependent. This is the world of nanoscience and nanotechnology. At the nanoscale the crystal structure may change and thermodynamic quantities such as the melting point also change. Changes in the catalytic activity and colour of nanoparticles suspended in a liquid indicate changes to the electronic structure. Quantum dots have discrete energy levels that can be modelled with the particle-in-a-box model. Excitons may be created in them using optical illumination, and their decay leads to fluorescence with distinct colours. The classical and quantum origins of magnetism are discussed. The origin of magnetoresistance in a ferromagnet is described and related to the exclusion principle. The origin of the giant magnetoresistance effect and its exploitation in nanotechnology is outlined.

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