Table 19. Orthorhombic system III

2005 ◽  
pp. 660-660
Author(s):  
A. G. Every ◽  
A. K. McCurdy
Keyword(s):  
Orthorhombic System

The Crystal and Molecular Structure of sym-fac-(1,4,7-Triazaheptane)-(S)-aspartatocobalt(III) Diperchlorate Dihydrate

1994 ◽  
Vol 59 (5) ◽  
pp. 1052-1058 ◽  
Author(s):  
Jan Ondráček ◽  
Jana Ondráčková ◽  
Jaroslav Maixner ◽  
František Jursík
Keyword(s):  
Molecular Structure ◽  
Aspartic Acid ◽  
Crystal And Molecular Structure ◽  
Heavy Atom ◽  
Membered Ring ◽  
Boat Conformation ◽  
Hydrogen Atoms ◽  
Orthorhombic System ◽  
Anisotropic Temperature ◽  
Heavy Atom Method

The crystal and molecular structure of s-fac-[Co((S)-Asp)(dien)]ClO4 . HClO4 .2 H2O (dien = 1,4,7-triazaheptane) was solved by the heavy atom method. The position parameters of the non-hydrogen atoms and their anisotropic temperature parameters were refined based on 1 726 observed reflections with a final value of R = 0.073. The substance crystallizes in the orthorhombic system in the space group P212121, Z = 4, a = 8.506(1), b = 17.171(2), c = 13.277(1) Å. The structure involves hydrogen bonds between the O2, O4 and HN2 atoms of aspartic acid and the two molecules of water. The five-membered dien chelate rings take the asymmetric envelope conformations. The five-membered ring of (S)-aspartic acid possesses the symmetric envelope conformation whereas the six-membered ring exhibits the skew boat conformation.

Sodium perchlorate in the space group Pnma

2006 ◽  
Vol 62 (7) ◽  
pp. i150-i151 ◽  
Author(s):  
Gui-Ling Zhang ◽  
Yan-Tuan Li ◽  
Zhi-Yong Wu ◽  
Yu-Lan Song
Keyword(s):  
Room Temperature ◽  
Sodium Perchlorate ◽  
Site Symmetry ◽  
Orthorhombic System ◽  
Space Group

The first example of Na+ClO4 − in the orthorhombic system in space group Pnma at room temperature is reported. The Na, Cl and two O atoms are located on positions of site symmetry m.

MOLTEN SALT SYNTHESIS OF YF3:Yb3+/Ln3+(Ln = Er3+, Tm3+) MICROSHEETS WITH MULTICOLOR UPCONVERSION LUMINESCENCE

2013 ◽  
Vol 06 (06) ◽  
pp. 1350061 ◽  
Author(s):  
MINGYE DING ◽  
CHUNHUA LU ◽  
LINHAI CAO ◽  
YARU NI ◽  
ZHONGZI XU
Keyword(s):  
Molten Salt ◽  
Laser Diode ◽  
Upconversion Luminescence ◽  
Emission Spectra ◽  
Upconversion Emission ◽  
Molten Salt Synthesis ◽  
Molten Salt Method ◽  
Orthorhombic System ◽  
Co Doping ◽  
First Time

In this paper, highly crystalline YF 3: Yb 3+/ Ln 3+( Ln = Er 3+, Tm 3+) microsheets were successfully synthesized by a surfactant-free molten salt method for the first time. The results indicated that the as-obtained samples belonged to orthorhombic system and exhibited microsheets morphology with side lengths of 30 to 80 μm and wall thickness from 1 to 1.5 μm. By changing the dopant's species ( Ln 3+), multicolor (yellow and blue) upconversion emission can be observed in YF 3: Yb 3+/ Ln 3+ microsheets under 980 nm laser diode (LD) excitation. The upconversion mechanisms in co-doping YF 3 samples were analyzed in detail based on the emission spectra. Importantly, this approach not only proposes a new alternative in synthesizing such materials, but also opens the possibility to meet the increasing commercial demand.

scholarly journals Kristallstruktur und Schwingungsspektrum des Thallium(I)-Zinn(II)-ortho-Thiophosphates TlSnPS4

1987 ◽  
Vol 42 (11) ◽  
pp. 1309-1312 ◽  
Author(s):  
Robert Becker ◽  
Wolfgang Brockner ◽  
Brigitte Eisenmann
Keyword(s):  
Raman Spectrum ◽  
Melting Point ◽  
Title Compound ◽  
Far Infrared ◽  
Orthorhombic System ◽  
Space Group ◽  
Lattice Constants ◽  
Moisture Sensitive

TlSnPS4 crystallizes in the orthorhombic system, space group Pna21 (Nr. 33), Z = 4 with the lattice constants a = 1175.8 (5) pm, b = 890.1 (4) pm, c = 663.3 (4) pm. In the structure are sligthly distorted discrete PS3-4 anions.The far infrared, infrared and Raman spectrum is assigned on the basis of PS3-4 -units with C3v symmetry. According to the DTA data the melting point for TlSnPS4 is 575 ± 5 °C. The title compound is not moisture sensitive and semi-conducting.

scholarly journals Symmetrical Analysis Phonon Modes of Crystal -Ag8SnSe6

2015 ◽  
Vol 16 (2) ◽  
pp. 257-260
Author(s):  
І.V. Semkiv ◽  
А.І. Kashuba ◽  
H.A. Ilchuk ◽  
M.V. Chekaylo
Keyword(s):  
Raman Spectra ◽  
Infrared Spectra ◽  
Room Temperature ◽  
Group Symmetry ◽  
Phonon Modes ◽  
Orthorhombic System ◽  
Space Group Symmetry ◽  
Space Group ◽  
Phonon Spectra

Symmetrical analysis of the phonon spectra of  lowtemperature b¢-phase of crystal Ag8SnSe6 carried out. At the room temperature argyrodite Ag8SnSe6 belong to orthorhombic system with space group symmetry Pmn21. Classification of the main phonon modes of crystal carried out. Clarified selection rules for Raman spectra and infrared spectra.

Crystal Structure of 3-(5-Acetyl-2-Aminothiazol-4-Ylthio)- 4-Hydroxypentan-2-one

2012 ◽  
Vol 554-556 ◽  
pp. 56-59
Author(s):  
Noor Azilah M. Kasim ◽  
Eliyanti A. Othman ◽  
Ummi Habibah Abdullah ◽  
Bohari M. Yamin
Keyword(s):  
Crystal Structure ◽  
Compound I ◽  
Orthorhombic System ◽  
Space Group

Reaction 3-thiocyanatoacetylacetone with leucine (C6H13O2N1) was found to give 3-(5-acetyl-2-aminothiazol-4-ylthio)-4-hydroxypentan-2-one (I). Compound I crystallized in the orthorhombic system with space group Pbca a= 8.143 Å, b=13.831Å, c=21.878Å. V= 2463.7Å3, Z=8.

Synthesis and Characterization of Calcium Zeolite-Cowlesite.

2021 ◽  
Vol 23 (05) ◽  
pp. 787-790
Author(s):  
Abhijit M ◽  
◽  
Suresh Kumar. B. V ◽  
Keyword(s):  
Low Temperature ◽  
Elemental Concentration ◽  
Stoichiometric Composition ◽  
Lattice Parameter ◽  
Raw Material ◽  
Synthesis And Characterization ◽  
Aluminum Silicate ◽  
Hydrothermal Conditions ◽  
Orthorhombic System

Cowlesite is a Calcium Aluminum silicate CaAl2Si3O106H2O which formed under the hydrothermal conditions of low temperature (1800C) and pressure (1.013250bar). Cowlesite minerals are known for their peculiar occurrence. Synthesis of Cowlesite mineral was carried by suitable stoichiometric composition. Hydrothermal synthesized Cowlesite mineral was characterized by XRD, SEM, and EDAX. It crystallized in the orthorhombic system and a lattice parameter a=23.22Å, b=30.58Å, c=25.01Å, Volume of Unit cell=17758.79Å3, α=β=γ=900. EDAX results show the elemental concentration of raw material which was used.

On the diathermancy of Antimonite

1903 ◽  
Vol 13 (62) ◽  
pp. 342-347
Author(s):  
A. Hutchinson
Keyword(s):  
Cleavage Surface ◽  
Direct Sunlight ◽  
Orthorhombic System ◽  
Elliptic Polarization ◽  
Polarization Of Light

A determination of the constants of elliptic polarization of light reflected from a fresh cleavage surface of antimonite enabled Professor P. Drude to calculate two of the indices of refraction of this substance as 5.17 and 4.49 respectively. Instead, however, of the symmetry-axes of the crystal, regarded as belonging to the orthorhombic system, coinciding with the principal vibration directions in the plane (010), he found that the latter were inclined to the former lines at angles which varied in different observations between 2.6° and 15.4°. These observations, which indicate that the symmetry of antimonite is of the oblique or anorthie type, stand in opposition to those of Professor O. Mügge, who found that exceedingly thin flakes of antimonite placed between crossed nicols in direct sunlight transmitted sufficient light of a deep red colour to enable him to determine the extinction as straight.

scholarly journals Crystal Structures of Ethyl 4-(4-Florophenyl)-6-phenyl-2-substituted-3-pyridinecarboxylates

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
ElSayed M. Shalaby ◽  
Aisha M. Moustafa ◽  
Adel S. Girgis ◽  
Aida M. ElShaabiny
Keyword(s):  
Crystal Structures ◽  
Piperidine Ring ◽  
Monoclinic System ◽  
Orthorhombic System ◽  
Space Group ◽  
Morpholine Ring

Three substituted pyridinecarboxylates were synthesized; (I) ethyl 2-bromo-4-4(fluorophenyl)-6-phenyl-3-pyridinecarboxylate, C20H15BrFNO2, (II) ethyl 4-(4-fluorophenyl)-2-(4-morpholinyl)-6-phenyl-3-pyridinecarboxylate, C24H23FN2O3, and (III) ethyl 4-(4-fluorophenyl)-6-phenyl-2-(1-piperidinyl)-3-pyridinecarboxylate, C25H25FN2O2. It was found that compound (I) belongs to the orthorhombic system with space group P212121, compound (II) to the monoclinic system with space group P21/c, and compound (III) to the monoclinic system with space group C2/c. The morpholine ring in (II) and piperidine ring in (III) have the shape of the distorted chair configuration.

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