Chiral zinc(II) bipyridine complex. Crystal structure and catalytic activity in asymmetric allylation reaction

1999 ◽  
Vol 23 (6) ◽  
pp. 629-632 ◽  
Author(s):  
Hoi-Lun Kwong ◽  
Kwok-Mei Lau ◽  
Wing-Sze Lee ◽  
Wing-Tak Wong
Keyword(s):  
Crystal Structure ◽  
Catalytic Activity ◽  
Asymmetric Allylation ◽  
Complex Crystal Structure ◽  
Complex Crystal

A Novel Example of Metal-Mediated Aromatic Thiolation in a Ruthenium Complex. Crystal Structure of RuII(SC6H4NNC6H4N)2†

1996 ◽  
Vol 35 (10) ◽  
pp. 3050-3052 ◽  
Author(s):  
Bidyut Kumar Santra ◽  
Ganesh A. Thakur ◽  
Prasanta Ghosh ◽  
Amitava Pramanik ◽  
Goutam Kumar Lahiri
Keyword(s):  
Crystal Structure ◽  
Ruthenium Complex ◽  
Complex Crystal Structure ◽  
Complex Crystal

scholarly journals The strongly defective double perovskite Sr11Mo4O23: crystal structure in relation to ionic conductivity

2014 ◽  
Vol 47 (4) ◽  
pp. 1395-1401 ◽  
Author(s):  
Carlos A. López ◽  
José C. Pedregosa ◽  
Diego G. Lamas ◽  
José A. Alonso
Keyword(s):  
Crystal Structure ◽  
Ionic Conductivity ◽  
Powder Diffraction ◽  
Double Perovskite ◽  
Ionic Mobility ◽  
Neutron Powder Diffraction Data ◽  
Complex Crystal Structure ◽  
Citrate Precursors ◽  
The Relationship ◽  
Complex Crystal

The crystal structure and ionic conductivity properties of a novel microcrystalline Sr11Mo4O23ceramic material are presented. This material has been prepared by thermal treatment up to 1473 K, in air, of previously decomposed citrate precursors. The complex crystal structure was refined from combined X-ray powder diffraction and neutron powder diffraction data. The formula of this phase can be rewritten as Sr1.75□0.25SrMoO5.75, highlighting the relationship with double perovskitesA2B′B′′O6. At room temperature, the crystal structure is tetragonal in space groupI41/a, witha= 11.6107 (6) Å,c= 16.422 (1) Å andV = 2213.8 (2) Å3. The crystal network contains O anion and Sr cation vacancies. The structure is complex, with Sr, Mo and O atoms distributed over four, two and six distinct Wyckoff sites, respectively. Only one of the Sr sites (SrO6) corresponds to the octahedral network; one of the two MoO6types of octahedra is axially distorted. The three other Sr positions occupy theAsite with higher coordination. There is an occupational deficit of O atoms of 22 (4)%. This defective framework material presents an interesting ionic mobility, enhanced above 773 K owing to a further reduction in the oxygen content.

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