Results 231 to 240 of about 6,129,594 (283)
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Topochemical single-crystal-to-single-crystal photodimerization
Chemical Physics Letters, 1980Abstract The topochemical and topotactic solid-state photodimerization of 2-benzyl-5-benzylidenecyclopentanone is shown to be single-crystal-to-single-crystal, with the cell parameters of the monomer and dimer being very nearly identical (the maximum change being a contraction of 0.7% along c).
Hachiro Nakanishi +2 more
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International Journal of Biological Macromolecules, 1990
Lamellar single crystals of chitosan were prepared at 125 degrees C by adding ammonia to a low DP fraction of chitosan dissolved in water. The crystals gave sharp electron diffraction diagrams which could be indexed in an orthorhombic P2(1)2(1)2(1) unit cell with a = 8.07 A, b = 8.44 A, c = 10.34 A.
Cartier, N., Domard, A., Chanzy, H.
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Lamellar single crystals of chitosan were prepared at 125 degrees C by adding ammonia to a low DP fraction of chitosan dissolved in water. The crystals gave sharp electron diffraction diagrams which could be indexed in an orthorhombic P2(1)2(1)2(1) unit cell with a = 8.07 A, b = 8.44 A, c = 10.34 A.
Cartier, N., Domard, A., Chanzy, H.
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Single-Crystal-to-Single-Crystal Transformation of Diolefin Derivatives in Nanocrystals
Journal of the American Chemical Society, 2002Topochemical [2 + 2] cycloaddition polymerization of methyl p-phenylenediacrylate and 2,5-distyrylpyridine in nanocrystals, prepared by the reprecipitation method, were investigated in comparison with those in bulk crystals. The bulk single crystals, larger than 1 mum in size, broke into microcrystals with variety of size and shape in the course of ...
Shu, Takahashi +5 more
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Chemical Communications, 2012
A series of Cu(II) complexes showed unprecedented reversible cascades of single-crystal-to-single-crystal (SCSC) transformations, and more interestingly, very rapid crystal dynamic processes were observed in this system via the substitution of coordinating components without loss of single crystallinity.
Gao-Chao, Lv +5 more
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A series of Cu(II) complexes showed unprecedented reversible cascades of single-crystal-to-single-crystal (SCSC) transformations, and more interestingly, very rapid crystal dynamic processes were observed in this system via the substitution of coordinating components without loss of single crystallinity.
Gao-Chao, Lv +5 more
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Reversible single-crystal to single-crystal polymorphic phase transformation of an organic crystal
Chemical Communications, 2010Two polymorphs of a substituted dihydroanthracene derivative were prepared by crystallization from different solvents. Each polymorph is reversibly interconvertible to the other by means of a single-crystal to single-crystal phase transformation.
Das D., Engel E., Barbour L.J.
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Journal of the American Chemical Society, 2013
We report here a new polymorph of cocrystal CuQ2-TCNQ that shows an oriented single-crystal-to-single-crystal phase transition along its a-axis at ambient conditions. Upon mechanical stimulation, it converts into another polymorph accompanied by almost doubling its length and halving its thickness.
Liu, Guangfeng +3 more
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We report here a new polymorph of cocrystal CuQ2-TCNQ that shows an oriented single-crystal-to-single-crystal phase transition along its a-axis at ambient conditions. Upon mechanical stimulation, it converts into another polymorph accompanied by almost doubling its length and halving its thickness.
Liu, Guangfeng +3 more
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Ultraviolet luminescence of single crystals and single-crystal films of YAlO3
Optics and Spectroscopy, 2004The nature of intrinsic emission bands of yttrium orthoaluminate in the UV spectral region at max=220 nm (5.63 eV) and 330 nm (4.13 eV) is studied on the basis of the luminescence of single crystals and single-crystal films of YAlO3 and Ce: YAlO3 excited by synchrotron radiation sources with an energy of 3–25 eV at 9 and 300 K.
Zorenko, Yu. V. +3 more
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Exciton luminescence of YAlO3 single crystals and single-crystal films
Optics and Spectroscopy, 2005The paper reports on a study of exciton luminescence in single crystals (SCs) and single-crystal films (SCFs) of YAlO3, which have substantially different concentrations of vacancy-type and substitutional defects, under excitation by synchrotron radiation near the fundamental absorption edge.
Zorenko, Yu. V. +3 more
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2007
The development of many new devices is strictly connected with the availability of materials in single crystalline form, with low density of crystallographic defects and specific electrical, magnetic, optical, chemical, and mechanical properties. This implies the development of suitable growth processes by which the composition, the structure, as well ...
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The development of many new devices is strictly connected with the availability of materials in single crystalline form, with low density of crystallographic defects and specific electrical, magnetic, optical, chemical, and mechanical properties. This implies the development of suitable growth processes by which the composition, the structure, as well ...
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Single‐Crystal‐to‐Single‐Crystal Synthesis of a Rope‐Ladder Polymer
Angewandte ChemieAbstract Here, we report a single‐crystal‐to‐single‐crystal (SCSC) synthesis of a fully organic ladder polymer via a topochemical azide‐alkyne cycloaddition (TAAC) reaction. A designed monomer featuring a rigid benzene core with flexible peptide‐linked azide and alkyne groups crystallized with three conformers in the asymmetric unit ...
Haripriya Balan +3 more
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