Results 281 to 290 of about 311,819 (318)

Single-Crystal-to-Single-Crystal Transformation of Diolefin Derivatives in Nanocrystals

Journal of the American Chemical Society, 2002
Topochemical [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, Hirohiko, Miura, Hitoshi, Kasai, Shuji, Okada, Hidetoshi, Oikawa, Hachiro, Nakanishi   +5 more
openaire   +2 more sources

Reversible single-crystal to single-crystal polymorphic phase transformation of an organic crystal

Chemical Communications, 2010
Two 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.
openaire   +4 more sources

Unprecedented crystal dynamics: reversible cascades of single-crystal-to-single-crystal transformations

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, Peng, Wang, Qing, Liu, Jian, Fan, Kai, Chen, Wei-Yin, Sun   +5 more
openaire   +2 more sources

Oriented Single-Crystal-to-Single-Crystal Phase Transition with Dramatic Changes in the Dimensions of Crystals

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, Liu, Jie, Liu, Yang, Tao, Xutang   +3 more
openaire   +3 more sources

Single‐chain single crystals

Macromolecular Symposia, 1997
AbstractSingle‐chain single crystals of isotactic polystyrene and poly(ethylene oxide) were studied by using transmission electron microscopy, high resolution electron microscopy, electron diffraction. Single‐chain single crystals were prepared by spreading a dilute solution of polymers on a water surface and collecting the resulting single‐chain ...
Jie Cao, Fangming Gu, Yongjian Liu, Shuguang Bi, Haishan Bu, Ze Zhang   +5 more
openaire   +1 more source

Ultraviolet luminescence of single crystals and single-crystal films of YAlO3

Optics and Spectroscopy, 2004
The 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., Voloshinovskii, A. S., Stryganyuk, G. M., Konstankevych, I. V.   +3 more
openaire   +2 more sources

Exciton luminescence of YAlO3 single crystals and single-crystal films

Optics and Spectroscopy, 2005
The 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., Voloshinovskii, A. S., Striganyuk, G. B., Gorbenko, V. I.   +3 more
openaire   +2 more sources

Reversible single-crystal to single-crystal transformation between triangular single-molecule toroics

Dalton Transactions, 2023
Single-crystal to single-crystal transformation by solvent exchange provides a new way to study magneto-structural relationships in single-molecule magnets.
Lixi Feng, Yue Yang, Yu-Xia Wang, Yizhen Zhao, Zhong-Yi Liu, Junzhuang Cong, Yi-Quan Zhang, Peng Cheng   +7 more
openaire   +2 more sources

Single‐molecule single crystals

Journal of Polymer Science Part B: Polymer Physics, 1991
AbstractVarious approaches to the preparation and verification of single‐molecule single crystals are discussed for polyethylene and poly (oxyethylene). Analytic tools are electron microscopy, electron diffraction, and differential scanning calorimetry.
Haishan Bu, Yanwan Pang, Dandan Song, Tongyin Yu, T. M. Voll, George Czornyj, B. Wunderlich   +6 more
openaire   +1 more source

Single‐Crystal‐to‐Single‐Crystal Synthesis of a Rope‐Ladder Polymer

Angewandte Chemie
Abstract 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, Gopika Sadasivan, Elizabeth Paul, Kana M. Sureshan   +3 more
openaire   +2 more sources