Group 4 metal halides/alumina solid superacids Relation between electronegativity, acid strength and catalytic properties

1998 ◽  
Vol 94 (5) ◽  
pp. 719 ◽  
Author(s):  
Marek Marczewski ◽  
Wojciech Juszczyk
Keyword(s):  
Catalytic Properties ◽  
Acid Strength ◽  
Metal Halides ◽  
Solid Superacids ◽  
Group 4 ◽  
Group 4 Metal

scholarly journals Correlated defects in group 4 metal-organic frameworks

2014 ◽  
Vol 70 (a1) ◽  
pp. C1124-C1124
Author(s):  
Matthew Cliffe ◽  
Wei Wan ◽  
Xiaodong Zou ◽  
François-Xavier Coudert ◽  
Andrew Goodwin
Keyword(s):  
Acid Catalysis ◽  
Catalytic Properties ◽  
Metal Organic Frameworks ◽  
X Ray Diffraction ◽  
X Ray ◽  
Framework Materials ◽  
Group 4 ◽  
Wide Range ◽  
Metal Organic ◽  
Group 4 Metal

The importance of defects for inorganic functional framework materials is well established, being crucial for properties from relaxor ferroelectricity to superconductivity. The corresponding study of defects in metal-organic frameworks (MOFs) is still however in its infancy. Recent studies have established that ligand-absence defects can be controllably introduced into frameworks and that these defects can drastically improve the material properties, but have so far shown no evidence of correlation between defects. Much of this research has focussed on UiO-66, a zirconium dicarboxylate MOF that was amongst the first very stable MOFs to be discovered.[1] As a result of its stability, it and its derivatives have been investigated for a wide range of properties including photo- and Brønsted acid catalysis, sensing and gas sorption properties. The ability to introduce defects has been demonstrated to substantially enhance both the sorption and catalytic properties of UiO-66.[2][3] We have demonstrated, using a combination of powder X-ray diffraction, total scattering and electron diffraction measurements, that UiO-66 can be engineered, under the appropriate synthetic conditions, to accommodate correlated defect nanodomains. These correlations offer exciting opportunities for manipulating the physical properties, including mass transport, chemical activity and mechanical flexibility.

A Family of Group 4 Metal Alkoxo Complexes with an M3(3-O) Core Relevant to Ziegler–Natta Catalyst Intermediates

2003 ◽  
Vol 9 (1) ◽  
pp. 181-190 ◽  
Author(s):  
Józef Utko ◽  
Szymon Przybylak ◽  
Lucjan B. Jerzykiewicz ◽  
Sławomir Szafert ◽  
Piotr Sobota
Keyword(s):  
Group 4 ◽  
Natta Catalyst ◽  
Group 4 Metal ◽  
Ziegler Natta Catalyst

Ancillary Ligand Effect on Single-Site Styrene Polymerization:  Isospecificity of Group 4 Metal Bis(phenolate) Catalysts

2003 ◽  
Vol 125 (17) ◽  
pp. 4964-4965 ◽  
Author(s):  
Carmine Capacchione ◽  
Antonio Proto ◽  
Henner Ebeling ◽  
Rolf Mülhaupt ◽  
Klaus Möller ◽  
...  
Keyword(s):  
Single Site ◽  
Ancillary Ligand ◽  
Ligand Effect ◽  
Styrene Polymerization ◽  
Group 4 ◽  
Group 4 Metal

NSSN-Type Group 4 Metal Complexes in the Ring-Opening Polymerization of l-Lactide

2021 ◽  
Author(s):  
Salvatore Impemba ◽  
Giuseppina Roviello ◽  
Stefano Milione ◽  
Carmine Capacchione
Keyword(s):  
Metal Complexes ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Type Group ◽  
Group 4 ◽  
Group 4 Metal
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