scholarly journals Molecular tectonics: crystal engineering of mixed valence Fe(ii)/Fe(iii) solid solutions

2010 ◽  
Vol 46 (6) ◽  
pp. 868-870 ◽  
Author(s):  
Pierre Dechambenoit ◽  
Sylvie Ferlay ◽  
Nathalie Kyritsakas ◽  
Mir Wais Hosseini
Keyword(s):  
Solid Solutions ◽  
Crystal Engineering ◽  
Mixed Valence ◽  
Molecular Tectonics

Mixed-valence impurities in lead telluride-based solid solutions

2002 ◽  
Vol 45 (8) ◽  
pp. 819-846 ◽  
Author(s):  
Boris A Volkov ◽  
Ludmila I Ryabova ◽  
Dmitrii R Khokhlov
Keyword(s):  
Solid Solutions ◽  
Mixed Valence ◽  
Lead Telluride

scholarly journals The effect of manganese oxidation state on antiferromagnetic order in SrMn1−xSbxO3 (0 < x < 0.5) perovskite solid solutions

2019 ◽  
Vol 7 (7) ◽  
pp. 2085-2095
Author(s):  
Gennady V. Bazuev ◽  
Alexander P. Tyutyunnik ◽  
Alexander V. Korolev ◽  
Emmanuelle Suard ◽  
Cheuk-Wai Tai ◽  
...  
Keyword(s):  
Solid Solution ◽  
Oxidation State ◽  
Solid Solutions ◽  
Mixed Valence ◽  
Antiferromagnetic Order ◽  
Manganese Oxidation ◽  
Magnetic Structures ◽  
First Time

Two ranges of mixed-valence manganese (Mn3+/Mn4+) SrMn1−xSbxO3 solid solution and corresponding magnetic structures were described for the first time.

Molecular tectonics — Use of urethanes and ureas derived from tetraphenylmethane and tetraphenylsilane to build porous chiral hydrogen-bonded networks

2004 ◽  
Vol 82 (2) ◽  
pp. 386-398 ◽  
Author(s):  
Dominic Laliberté ◽  
Thierry Maris ◽  
James D Wuest
Keyword(s):  
Hydrogen Bonding ◽  
Asymmetric Catalysis ◽  
Crystal Engineering ◽  
Three Dimensional ◽  
Enantiomerically Pure ◽  
X Ray ◽  
Molecular Tectonics ◽  
X Ray Crystallography ◽  
Open Networks ◽  
Hydrogen Bonded

Tetraphenylmethane, tetraphenylsilane, and simple derivatives with substituents that do not engage in hydrogen bonding typically crystallize as close-packed structures with essentially no space available for the inclusion of guests. In contrast, derivatives with hydrogen-bonding groups are known to favor the formation of open networks that include significant amounts of guests. To explore this phenomenon, we synthesized six new derivatives 5a–5e and 6a of tetraphenylmethane and tetraphenylsilane with urethane and urea groups at the para positions, crystallized the compounds, and determined their structures by X-ray crystallography. As expected, all six compounds crystallize to form porous three-dimensional hydrogen-bonded networks. In the case of tetraurea 5e, 66% of the volume of the crystals is accessible to guests, and guests can be exchanged in single crystals without loss of crystallinity. Of special note are: (i) the use of tetrakis(4-isocyanatophenyl)methane (1f) as a precursor for making enantiomerically pure tetraurethanes and tetraureas, including compounds 5b, 5c; and (ii) their subsequent crystallization to give porous chiral hydrogen-bonded networks. Such materials promise to include chiral guests enantioselectively and to be useful in the separation of racemates, asymmetric catalysis, and other applications.Key words: crystal engineering, molecular tectonics, hydrogen bonding, networks, porosity, urethanes, ureas, tetraphenylmethane, tetraphenylsilane.

Non-stoichiometric defect-controlled reduction toward mixed-valence Mn-doped hexaaluminates and their optical applications

2019 ◽  
Vol 7 (19) ◽  
pp. 5716-5723 ◽  
Author(s):  
Jieqi Hu ◽  
Enhai Song ◽  
Yayun Zhou ◽  
Shaolin Zhang ◽  
Shi Ye ◽  
...  
Keyword(s):  
Solid Solutions ◽  
Mixed Valence ◽  
Temperature Sensing ◽  
Composition Variation ◽  
Defect Control ◽  
Optical Applications ◽  
Mn Doped

The valence manipulation of emissive Mn ions (Mn2+/Mn4+) in Ba0.75Al11O17.25–BaMgAl10O17 solid solutions and their corresponding application in temperature-sensing have been demonstrated by defect control along with composition variation.

Mixed-valence impurities in lead telluride-based solid solutions

2002 ◽  
Vol 172 (8) ◽  
pp. 875 ◽  
Author(s):  
Boris A. Volkov ◽  
Ludmila I. Ryabova ◽  
Dmitrii R. Khokhlov
Keyword(s):  
Solid Solutions ◽  
Mixed Valence ◽  
Lead Telluride
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