Photochromism of 1,2-Bis(2-ethyl-5-phenyl-3-thienyl)perfluorocyclopentene in a Single-Crystalline Phase. Conrotatory Thermal Cycloreversion of the Closed-Ring Isomer

2000 ◽  
Vol 122 (49) ◽  
pp. 12135-12141 ◽  
Author(s):  
Seiya Kobatake ◽  
Katsunori Shibata ◽  
Kingo Uchida ◽  
Masahiro Irie
Keyword(s):  
Crystalline Phase ◽  
Single Crystalline ◽  
Closed Ring

Preparation of Macroprous C12A7 Mayenite Monoliths via a Sol-Gel Process with Nitrates as Precursors

2018 ◽  
Vol 768 ◽  
pp. 211-217 ◽  
Author(s):  
Rui Wang ◽  
Yu Kun Sun ◽  
Bao Jia Qi Jiang ◽  
Hui Yang ◽  
Xing Zhong Guo
Keyword(s):  
Heat Treatment ◽  
Phase Separation ◽  
Binary System ◽  
Propylene Oxide ◽  
Crystalline Phase ◽  
Sol Gel ◽  
Single Crystalline ◽  
Sol Gel Process

Macroporous Ca12Al14O33(C12A7) mayenite monoliths have been successfully prepared via a sol-gel process in the presence of propylene oxide (PO) and poly (ethyleneoxide) (PEO). Gelation of CaO-Al2O3binary system with nitrates salts as additional precursors is accelerated by PO as an acid scavenger, while PEO works as a phase separation inducer to mediate the phase separation of the system. Appropriate PO and PEO amounts allow the formation of monolithic xerogel with interconnected macropores and co-continuous skeletons. The resultant dried gels are amorphous and the single crystalline phase Ca12Al14O33mayenite forms after heat-treatment at 1100 °C in air, while the macrostructure is preserved with a porosity as high as 78% and smoother and denser skeletons.

Zeolite Syntheses from Superalkaline Reaction Mixtures

1992 ◽  
Vol 57 (4) ◽  
pp. 788-793 ◽  
Author(s):  
Falk Fischer ◽  
Marianne Hadan ◽  
Günter Fiedrich
Keyword(s):  
Ir Spectroscopy ◽  
Crystalline Phase ◽  
Ion Concentration ◽  
Single Crystalline ◽  
Hydroxyl Ion ◽  
Type Zeolite

The synthesis of faujasite-type zeolite from superalkaline reaction mixtures are described. The contribution shows the influence of component K2O added in the system Na2O-Al2O3-SiO2-H2O with H2O/(K2O + Na2O) = 13-15. The reaction course was investigated in the range K2O/(K2O + Na2O) from about 0.07 to 0.5. Under used conditions it is quite possible to isolate faujasite-type zeolite as a single crystalline phase. By means of IR spectroscopy, low SiO2/Al2O3 ratios from 2.0 to 2.1 in the faujasite framework have been indicated. The low SiO2/Al2O3 ratios are interpreted by a higher stability of the Si-O-Al- than the Si-O-Si- bond with increasing hydroxyl ion concentration.

Single-Crystalline-Phase Mo3VOx: An Efficient Catalyst for the Partial Oxidation of Acrolein to Acrylic Acid

ChemCatChem ◽  
2013 ◽  
Vol 5 (10) ◽  
pp. 2869-2873 ◽  
Author(s):  
Chen Chen ◽  
Nakatani Kosuke ◽  
Toru Murayama ◽  
Wataru Ueda
Keyword(s):  
Acrylic Acid ◽  
Partial Oxidation ◽  
Crystalline Phase ◽  
Efficient Catalyst ◽  
Single Crystalline

Reversible Diastereoselective Photocyclization of a Diarylethene in a Single-Crystalline Phase

2000 ◽  
Vol 122 (40) ◽  
pp. 9631-9637 ◽  
Author(s):  
Tetsuhiro Kodani ◽  
Kenji Matsuda ◽  
Taro Yamada ◽  
Seiya Kobatake ◽  
Masahiro Irie
Keyword(s):  
Crystalline Phase ◽  
Single Crystalline

Photochromism and Photomagnetism of Biindenylidene-Dione Derivative in a Single Crystalline Phase

2002 ◽  
Vol 389 (1) ◽  
pp. 33-37 ◽  
Author(s):  
Lili Xu ◽  
Jiben Meng ◽  
Hui Wang ◽  
Ping Li ◽  
Teruki Sugiyama ◽  
...  
Keyword(s):  
Crystalline Phase ◽  
Single Crystalline ◽  
Dione Derivative

Zeolite - Salt Occlusion: A Potential Route for the Immobilisation of Iodine-129?

2003 ◽  
Vol 807 ◽  
Author(s):  
Neil C. Hyatt ◽  
Joseph A. Hriljac ◽  
Alia Choudhry ◽  
Laura Malpass ◽  
Gareth P. Sheppard ◽  
...  
Keyword(s):  
Weight Loss ◽  
Uniform Distribution ◽  
Crystalline Phase ◽  
Thermally Stable ◽  
X Ray Diffraction ◽  
Single Crystalline ◽  
X Ray ◽  
Elemental Silver

ABSTRACTReactions of zeolite Na-A with AgI, and the sodium, copper and lead forms of zeolites A, LTA, X and Y with NaI, have been examined as possible starting routes to the long term immobilisation of iodine-129. Heating the salts in air, at 500°C, with the sodium forms of the zeolites leads to the formation of occlusion products, where the iodide salt migrates into the zeolite pores. Detailed studies of the Na-A / 5AgI complex indicate it has a uniform distribution of Na, Si, Al, Ag and I, and is thermally stable to ca. 750°C, where there is a substantial weight loss as iodine is released. In situ powder X-ray diffraction studies have been used to monitor the occlusion reaction at 400°C, and show that the occlusion product decomposes to produce a single crystalline phase at 800°C prior to further decomposition at 850°C to a mixture of nepheline and elemental silver.

scholarly journals Exchange bias effect in single crystalline phase MnO nanoparticles

2013 ◽  
Vol 62 (17) ◽  
pp. 176102
Author(s):  
Luo Yi ◽  
Zhao Guo-Ping ◽  
Yang Hai-Tao ◽  
Song Ning-Ning ◽  
Ren Xiao ◽  
...  
Keyword(s):  
Crystalline Phase ◽  
Exchange Bias ◽  
Bias Effect ◽  
Exchange Bias Effect ◽  
Single Crystalline

The temperature dependent luminescent decay kinetics of an emissive copper complex in the single crystalline phase using time-gated luminescence microscopy

2016 ◽  
Vol 173 ◽  
pp. 30-33 ◽  
Author(s):  
Crysania M. Linderman ◽  
Jarrett A. Coppin ◽  
Corey O’Brien ◽  
Jordan M. Cox ◽  
Dinesh (Dan) G. Patel ◽  
...  
Keyword(s):  
Copper Complex ◽  
Crystalline Phase ◽  
Decay Kinetics ◽  
Temperature Dependent ◽  
Luminescence Microscopy ◽  
Single Crystalline ◽  
Kinetics Of
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