Spiral-Type Heteropolyhedral Coordination Network Based on Single-Crystal LiSrPO4: Implications for Luminescent Materials

2013 ◽  
Vol 19 (45) ◽  
pp. 15358-15365 ◽  
Author(s):  
Chun Che Lin ◽  
Chin-Chang Shen ◽  
Ru-Shi Liu
Keyword(s):  
Single Crystal ◽  
Luminescent Materials ◽  
Coordination Network ◽  
Spiral Type

Reversible single-crystal-to-single-crystal conversion of a photoreactive coordination network for rewritable optical memory storage

2020 ◽  
Vol 56 (13) ◽  
pp. 1984-1987 ◽  
Author(s):  
Ni-Ya Li ◽  
Jing-Min Chen ◽  
Xiao-Yan Tang ◽  
Guo-Ping Zhang ◽  
Dong Liu
Keyword(s):  
Single Crystal ◽  
Optical Memory ◽  
Memory Storage ◽  
Coordination Network

Reversible single-crystal-to-single-crystal photoreaction of a coordination network exhibits switchable fluorescence for rewritable optical memory storage.

The Effect of Starting Silicon Crystal Structure on Photoluminescence Intensity of Porous Silicon

1994 ◽  
Vol 358 ◽  
Author(s):  
W. B. Dubbelday ◽  
S. D. Russell ◽  
K. L. Kavanagh
Keyword(s):  
Porous Silicon ◽  
Single Crystal ◽  
Amorphous Silicon ◽  
Silicon Crystal ◽  
Single Crystal Silicon ◽  
Luminescent Materials ◽  
Photoluminescence Intensity ◽  
Crystal Silicon ◽  
Chemical Etch ◽  
Porosity Measurements

ABSTRACTIn previous work we reported that porous silicon (PS) films formed using a dilute HF:HNO3 chemical etch on polycrystalline, implant damaged single crystal, or amorphous starting material have luminescent characteristics that differ from PS fabricated on single crystal silicon1. Polycrystalline and implant damaged porous silicon exhibits brighter luminescence compared to single crystal silicon etched under identical conditions. No photoluminescence is detected from the porous amorphous silicon. In this work these effects are examined using HF:NaNO2 solutions with freely available NO2. The accelerated etching effects from work damage are reduced, and the PS from polycrystalline and implant damaged silicon luminesce with the same intensity as the PS from single crystal silicon. Again, etched amorphous silicon does not luminesce. TEM and EDX porosity measurements are used to determine the differences in structure and etching characteristics between the luminescent and non-luminescent materials.

scholarly journals Gas Phase Single Crystal Growth of Coordination Networks

2014 ◽  
Vol 70 (a1) ◽  
pp. C1009-C1009
Author(s):  
Tatsuhiro Kojima ◽  
Wanuk Choi ◽  
Masaki Kawano
Keyword(s):  
Crystal Growth ◽  
Single Crystal ◽  
Gas Phase ◽  
Single Crystal Growth ◽  
Powder Materials ◽  
Phase Reaction ◽  
Coordination Networks ◽  
Reduced Pressure ◽  
Coordination Network ◽  
Saddle Type

Organic ligands and metal ions can produce several kinds of networks depending on experimental conditions, such as solvent, temperature, reaction speed, and so on.1, 2 While many MOF chemists have used solution phase reaction, recently some unique networking methods have been investigated, e.g. mechanochemical solid state reactions. Here we report a new method for single crystal growth of porous coordination networks via gas phase. In our previous work, we found that heating of interpenetrated network [(ZnI2)3(TPT)2]n (solvent) forms a crystalline powder, [(ZnI2)3(TPT)2]n (1, TPT = 2,4,6-tris(4-pyridyl)triazine).3 We determined a porous saddle-type structure of 1 by ab initio PXRD analysis. Interestingly, we could not prepare 1 by grinding and heating the starting powder materials of ZnI2 and TPT. Therefore, we attempted to prepare coordination networks via gas phase. On heating of ZnI2 and TPT together under reduced pressure in a glass ample at high temperature, single crystal growth of 1 was observed. The single crystal X-ray structure analysis revealed that 1 has the same structure as microcrystalline powder of 1. In gas phase, because there is no solvation effect, network topology is purely based on ligand interactivity and geometry of metal coordination. Therefore, saddle-type network is one of the possible patterns on the basis of geometry of only TPT and ZnI2 without guest molecules. To the best of our knowledge, this is the first example of single crystal growth of porous coordination network via gas phase. In summary, we successfully demonstrated the first gas phase single crystal growth of porous coordination network formation. In this presentation, we will discuss network design by gas phase reaction based on ligand interactivity focusing on weak intermolecular interaction.

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