Crystal structure of Thermobifida fusca cis-prenyltransferase reveals the dynamic nature of its RXG motif-mediated inter-subunit interactions critical for its catalytic activity

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.

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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)

Journal of the Chemical Society Chemical Communications ◽

10.1039/c39930001132 ◽

1993 ◽

pp. 1132-1133 ◽

Cited By ~ 24

Author(s):

Majid Motevalli ◽

Mahesh Sanganee ◽

Paul D. Savage ◽

Syed Shah ◽

Alice C. Sullivan

Keyword(s):

Crystal Structure ◽

Catalytic Activity ◽

Ethylene Polymerisation

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

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.457-458.139 ◽

2013 ◽

Vol 457-458 ◽

pp. 139-143 ◽

Cited By ~ 1

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.

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Small is different

10.1093/oso/9780192846839.003.0007 ◽

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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