Polarized fluorescence of a crystal having uniaxially oriented molecules by a carbazole-diyl-bridged macrocage

CrystEngComm ◽  
2019 ◽  
Vol 21 (26) ◽  
pp. 3910-3914 ◽  
Author(s):  
Hikaru Hashimoto ◽  
Yusuke Inagaki ◽  
Hiroyuki Momma ◽  
Eunsang Kwon ◽  
Kentaro Yamaguchi ◽  
...  
Keyword(s):  
Single Crystal ◽  
Electron System ◽  
Polarized Fluorescence ◽  
Oriented Molecules

An axially oriented π-electron system is achieved in a single crystal of a macrocage molecule, and polarized fluorescence of the single crystal was observed.

Polarized fluorescence spectrum of triphenylene in a n‐heptane single crystal. Evidence for deformed molecules

1978 ◽  
Vol 69 (8) ◽  
pp. 3639-3646 ◽  
Author(s):  
Michel Lamotte ◽  
Salomon Risemberg ◽  
Anne‐Marie Merle ◽  
Jacques Joussot–Dubien
Keyword(s):  
Single Crystal ◽  
Fluorescence Spectrum ◽  
Polarized Fluorescence

scholarly journals Erratum: Polarized fluorescence spectrum of triphenylene in an‐heptane single crystal. Evidence for deformed molecules

1979 ◽  
Vol 70 (4) ◽  
pp. 2050-2050
Author(s):  
Michel Lamotte ◽  
Salomon Risemberg ◽  
Anne‐Marie Merle ◽  
Jacques Joussot‐Dubien
Keyword(s):  
Single Crystal ◽  
Fluorescence Spectrum ◽  
Polarized Fluorescence

scholarly journals Nearly-free-electron system of monolayer Na on the surface of single-crystal HfSe2

2016 ◽  
Vol 94 (20) ◽  
Author(s):  
T. Eknapakul ◽  
I. Fongkaew ◽  
S. Siriroj ◽  
R. Vidyasagar ◽  
J. D. Denlinger ◽  
...  
Keyword(s):  
Single Crystal ◽  
Free Electron ◽  
Electron System

Polarized fluorescence in α-sexithienyl single crystal at 4.2 K

1998 ◽  
Vol 108 (17) ◽  
pp. 7327-7333 ◽  
Author(s):  
M. Muccini ◽  
E. Lunedei ◽  
A. Bree ◽  
G. Horowitz ◽  
F. Garnier ◽  
...  
Keyword(s):  
Single Crystal ◽  
Polarized Fluorescence

Erdalkaliquadratate, II SrC4O4 · 3H2O Typ I [1] / Alkaline-Earth Squarates, II SrC4O4 · 3H2O Type I [1]

1986 ◽  
Vol 41 (12) ◽  
pp. 1490-1494 ◽  
Author(s):  
Christian Robl ◽  
Armin Weiss
Keyword(s):  
Hydrogen Bonding ◽  
Single Crystal ◽  
Alkaline Earth ◽  
Electron System ◽  
Water Molecules ◽  
Type I ◽  
Bond Lengths ◽  
Oxygen Atoms

Abstract In SrC4O4-3H2O (type I), Sr2+ has CN 8. It is surrounded by 3 water molecules and 5 oxygen atoms of 4 different squarate dianions. The C-O and C-C bond lengths are typical of extensive delocalization of the π-electron system. The connection of Sr2+ and C4O42- leads to infinite layers, obviously interlinked by hydrogen bonding.The oxygens of the squarate behave differently: two are Sr-chelating, but simultaneously bound to two additional Sr2+, one is connected with one Sr2+ only, and the fourth is not bound to any Sr2+. The single crystal character remained in principle unchanged during dehydration to SrC4O4 · 1 H2O and subsequent rehydration to the trihydrate. Grinding of a crystal treated in this way led to a new modification of SrC4O4 ·3 H2O.

A Preparation of High Resolution Standards for Electron Microscopy. Part II

1971 ◽  
Vol 29 ◽  
pp. 160-161
Author(s):  
Akira Tanaka ◽  
David F. Harling
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Carbon Black ◽  
Single Crystal ◽  
Dark Field ◽  
Graphitized Carbon Black ◽  
Graphitized Carbon ◽  
Dark Field Imaging ◽  
Crystal Films ◽  
Micro Holes

In the previous paper, the author reported on a technique for preparing vapor-deposited single crystal films as high resolution standards for electron microscopy. The present paper is intended to describe the preparation of several high resolution standards for dark field microscopy and also to mention some results obtained from these studies. Three preparations were used initially: 1.) Graphitized carbon black, 2.) Epitaxially grown particles of different metals prepared by vapor deposition, and 3.) Particles grown epitaxially on the edge of micro-holes formed in a gold single crystal film.The authors successfully obtained dark field micrographs demonstrating the 3.4Å lattice spacing of graphitized carbon black and the Au single crystal (111) lattice of 2.35Å. The latter spacing is especially suitable for dark field imaging because of its preparation, as in 3.), above. After the deposited film of Au (001) orientation is prepared at 400°C the substrate temperature is raised, resulting in the formation of many square micro-holes caused by partial evaporation of the Au film.

Structure of Palladium Single-Crystal Films Prepared by Flash Evaporation onto (001) NaCl Substrates

1970 ◽  
Vol 28 ◽  
pp. 456-457
Author(s):  
L. E. Murr ◽  
G. Wong
Keyword(s):  
Single Crystal ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
High Rate ◽  
Flash Evaporation ◽  
Optimum Load ◽  
Single Crystal Films ◽  
Crystal Films ◽  
A Current

Palladium single-crystal films have been prepared by Matthews in ultra-high vacuum by evaporation onto (001) NaCl substrates cleaved in-situ, and maintained at ∼ 350° C. Murr has also produced large-grained and single-crystal Pd films by high-rate evaporation onto (001) NaCl air-cleaved substrates at 350°C. In the present work, very large (∼ 3cm2), continuous single-crystal films of Pd have been prepared by flash evaporation onto air-cleaved (001) NaCl substrates at temperatures at or below 250°C. Evaporation rates estimated to be ≧ 2000 Å/sec, were obtained by effectively short-circuiting 1 mil tungsten evaporation boats in a self-regulating system which maintained an optimum load current of approximately 90 amperes; corresponding to a current density through the boat of ∼ 4 × 104 amperes/cm2.

Dislocations, Ordering and Antiferromagnetic Domains in MnO

1970 ◽  
Vol 28 ◽  
pp. 522-523
Author(s):  
D. J. Barber ◽  
R. G. Evans
Keyword(s):  
Electron Diffraction ◽  
Single Crystal ◽  
Optical Microscopy ◽  
Defect Chemistry ◽  
Magnetic Structures ◽  
Optically Transparent ◽  
Magnetic Features ◽  
Antiferromagnetic Domains

Manganese (II) oxide, MnO, in common with CoO, NiO and FeO, possesses the NaCl structure and shows antiferromagnetism below its Neel point, Tn∼ 122 K. However, the defect chemistry of the four oxides is different and the magnetic structures are not identical. The non-stoichiometry in MnO2 small (∼2%) and below the Tn the spins lie in (111) planes. Previous work reported observations of magnetic features in CoO and NiO. The aim of our work was to find explanations for certain resonance results on antiferromagnetic MnO.Foils of single crystal MnO were prepared from shaped discs by dissolution in a mixture of HCl and HNO3. Optical microscopy revealed that the etch-pitted foils contained cruciform-shaped precipitates, often thick and proud of the surface but red-colored when optically transparent (MnO is green). Electron diffraction and probe microanalysis indicated that the precipitates were Mn2O3, in contrast with recent findings of Co3O4 in CoO.

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