Raman spectrum of cadmium nitrate

1978 ◽  
Vol 31 (6) ◽  
pp. 1189 ◽  
Author(s):  
DW James ◽  
MT Carrick ◽  
WH Leong
Keyword(s):  
Crystal Structure ◽  
Raman Spectrum ◽  
Potential Energy ◽  
Raman Spectra ◽  
Site Symmetry ◽  
Cadmium Nitrate ◽  
Multiple Site ◽  
Space Group ◽  
Anhydrous Salt ◽  
Centrosymmetric Space Group

The Raman spectra of Cd(NO3)2,4H2O and anhydrous Cd(NO3)2 are reported. The spectrum of Cd(NO3)2,4H2O is compatible with the known crystal structure Fdd2. The spectrum of the anhydrous salt is complex and indicates that the 16 NO3- ions are on four sites with different potential energy environments and each site is occupied by four NO3- ions. The centrosymmetric space group Pbcm is favoured to the non- centrosymmetric space group Pca21. Multiple-site splitting, site- symmetry splitting and correlation-field splitting are used to explain the complex band structures.

Kristallstruktur und Schwingungsspektren des Di-Blei-Hexaselenohypodiphosphates Pb2P2Se6 / Crystal Structure and Vibrational Spectra of Pb2P2Se6

1984 ◽  
Vol 39 (4) ◽  
pp. 357-361 ◽  
Author(s):  
Robert Becker ◽  
Wolfgang Brockner ◽  
Herbert Schäfer
Keyword(s):  
Crystal Structure ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Title Compound ◽  
Far Infrared ◽  
Infrared And Raman Spectra ◽  
Monoclinic System ◽  
Space Group ◽  
Lattice Constants

Pb2P2Se6 crystallizes in the monoclinic system, space group Pn (No. 13) with the lattice constantsa = 974.2 (4) pm. b = 766.2 (3) pm. c = 689.8 (3) pm, β=91.44(5)°.The title compound is isotypic to the homologous Pb2P2S6. In the structure there are discrete P2Se4-6 anions.Far infrared, infrared and Raman spectra of this compound have been recorded. The observed frequencies are assigned on the basis of P2Se4-6 units with C2h symmetry in the crystal. DTA-data have been determined and interpreted.

scholarly journals 2,2-Difluoro-3-(4-fluorophenyl)-2H-benzo[e][1,3,2]oxazaborinin-3-ium-2-uide

IUCrData ◽  
2017 ◽  
Vol 2 (8) ◽  
Author(s):  
Błażej Dziuk ◽  
Borys Ośmiałowski ◽  
Anna Zakrzewska ◽  
Krzysztof Ejsmont ◽  
Bartosz Zarychta
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Dihedral Angle ◽  
Title Compound ◽  
Independent Molecule ◽  
Asymmetric Unit ◽  
Space Group ◽  
Compound C ◽  
Centrosymmetric Space Group ◽  
Intermolecular Contacts

There is one independent molecule in the asymmetric unit of the title compound, C13H9BF3NO, which crystallizes in the non-centrosymmetric space groupCc. In the molecular structure, the BF2-carrying ring is distorted from planarity and its mean plane makes a dihedral angle of 42.3 (1)° with the 4-fluorophenyl ring. F atoms are involved in all of the short intermolecular contacts of the crystal structure, which link molecules to form chains along [001] and [010].

Ba4YZr3F23 and Ba4LnZr3F23: a new noncentrosymmetric potential host structure type for optical devices

2019 ◽  
Vol 75 (11) ◽  
pp. 1488-1493
Author(s):  
Jean-Paul Laval ◽  
Abdelkrim Taoudi
Keyword(s):  
Crystal Structure ◽  
Composition Range ◽  
Structure Type ◽  
Optical Devices ◽  
Fluoride Glasses ◽  
Space Group ◽  
Potential Host ◽  
Centrosymmetric Space Group ◽  
Host Structure ◽  
Barium Yttrium

The first ternary BaF2–Ln(Y)F3–ZrF4 phases crystallizing near the composition range of fluoride glasses, namely Ba4YZr3F23 (barium yttrium fluoridozirconate) and isotypic Ba4LnZr3F23 (Ln = Yb, Er and Nd), have been synthesized. The crystal structure of Ba4YZr3F23 cannot be correctly determined in the centrosymmetric space group Pnma (R1 = 0.09); it is preferably described in the noncentrosymmetric space group Pn21 a (R1 = 0.028). All cations are located at y = 0.25–0.29 and 0.75–0.79. This new structure type is formed by infinite {[YZr3F23]8−} n columns associating, along [001], YF9 tricapped trigonal prisms, ZrF8 dodecahedra and ZrF7 polyhedra. These columns are interconnected via BaF10+1 and BaF12 irregular polyhedra.

scholarly journals Olivine-type NaCd(AsO4)

2013 ◽  
Vol 69 (11) ◽  
pp. i75-i75 ◽  
Author(s):  
Matthias Weil
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Structure Type ◽  
Site Symmetry ◽  
Space Group ◽  
Tetrahedral Voids ◽  
Hexagonal Closed Packed

The title compound, sodium cadmium orthoarsenate, adopts the olivine [Mg2(SiO4)] structure type in space groupPnma, with Na (site symmetry -1) and Cd (.m.) replacing the two Mg positions, and the AsO4tetrahedron (.m.) the SiO4tetrahedron. The crystal structure is made up of a nearly hexagonal closed-packed arrangement of O atoms stacked along [001]. The Na and Cd atoms occupy one half of the octahedral voids in alternate layers stacked along [100], and one eighth of the tetrahedral voids are occupied by As atoms.

scholarly journals Synthesis and crystal structure of Na4Ni7(AsO4)6

2016 ◽  
Vol 72 (5) ◽  
pp. 632-634 ◽  
Author(s):  
Rénald David
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Monoclinic Space Group ◽  
Site Symmetry ◽  
Asymmetric Unit ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
Ceramic Synthesis ◽  
The One

The title compound, tetrasodium heptanickel hexaarsenate, was obtained by ceramic synthesis and crystallizes in the monoclinic space groupC2/m. The asymmetric unit contains seven Ni atoms of which two have site symmetry 2/mand three site symmetry 2, four As atoms of which two have site symmetrymand two site symmetry 2, three Na atoms of which two have site symmetry 2, and fifteen O atoms of which four have site symmetrym. The structure of Na4Ni7(AsO4)6is made of layers of Ni octahedra and As tetrahedra assembled in sheets parallel to thebcplane. These layers are interconnected by corner-sharing between NiO6octahedra and AsO4tetrahedra. This linkage creates tunnels running along thecaxis in which the Na atoms are located. This arrangement is similar to the one observed in Na4Ni7(PO4)6, but the layers of the two compounds are slightly different because of the disorder of one of the Ni sites in the structure of the title compound.

The crystal structure and polarised Raman spectrum of Rb2AgI3

1977 ◽  
Vol 55 (9) ◽  
pp. 1511-1514 ◽  
Author(s):  
Ian David Brown ◽  
Helen Elaine Howard-Lock ◽  
Mahadevan Natarajan
Keyword(s):  
Crystal Structure ◽  
Raman Spectrum ◽  
Space Group ◽  
Symmetry Species

The crystal structure of Rb2AgI3, space group Pnma, a = 10.258(2), b = 4.886(4), c = 20.063(10) Å, has been refined. It is isostructural with K2AgI3 with chains of corner linked AgI4 tetrahedra (Ag—I(bridge) = 2.881 Å, Ag—I(terminal) = 2.834 Å) running along b. The average bonding distance around the two seven coordinate Rb atoms is 3.722 Å. The polarised Raman spectrum shows the expected 36 modes which are assigned to four different symmetry species. All modes occur with frequencies less than 112 cm−1.

Kristallstruktur und Schwingungsspektren des Di-Blei-Hexathiohypodiphosphates Pb2P2S6 / Crystal Structure and Vibrational Spectra of Pb2P2S6

1983 ◽  
Vol 38 (8) ◽  
pp. 874-879 ◽  
Author(s):  
Robert Becker ◽  
Wolfgang Brockner ◽  
Herbert Schäfer
Keyword(s):  
Crystal Structure ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Far Infrared ◽  
Infrared And Raman Spectra ◽  
Monoclinic Modification ◽  
Monoclinic System ◽  
Space Group ◽  
Lattice Constants

Abstract Pb2P2S6 crystallizes in the monoclinic system, space group Pn with the lattice constants a = 940.2(4) pm, b= 746.6(3) pm, c = 661.2(3) pm, β = 91.53(5)°. The compound is isotypic to the monoclinic modification II of Sn2P2S6 . In the structure there are discrete P2S4-6 -anions.Far infrared, infrared and Raman spectra of this compound have been recorded. The observed frequencies are assigned on the basis of P2S4-6 units with C2h symmetry in the crystal. DTA-data have been determined and interpreted.

[Ba(XeF2)5](AF6)2, A = Ru, Nb - Synthesis, Crystal Structure and Raman Spectra

2008 ◽  
Vol 73 (12) ◽  
pp. 1645-1654 ◽  
Author(s):  
Tina Bunič ◽  
Melita Tramšek ◽  
Evgeny Goreshnik ◽  
Boris Žemva
Keyword(s):  
Crystal Structure ◽  
Raman Spectra ◽  
Coordination Compound ◽  
Room Temperature ◽  
Formula Unit ◽  
Electrostatic Forces ◽  
Orthorhombic Space Group ◽  
Space Group

The reaction of Ba(NbF6)2 and excess XeF2 in anhydrous HF at room temperature yields [Ba(XeF2)5](NbF6)2. This is the first example of the coordination compound with XeF2 molecule as a ligand and NbF6- anion. It crystallizes in the orthorhombic space group Fmmm, with a = 12.084(6) Å, b = 13.646(7) Å, c = 13.927(7) Å, V = 2297(2) Å3, and Z = 4. The reaction of XeF2·Xe2F3·RuF6 and BaF2 in anhydrous HF yields [Ba(XeF2)5](RuF6)2 - the first example of the coordination compound containing RuF6- anion and XeF2 molecules. It appears to be isostructural with [Ba(XeF2)5](NbF6)2, with a = 11.9510(14) Å, b = 13.5174(14) Å, c = 13.8488(12) Å, V = 2237.2(4) Å3, and Z = 4. The Raman spectra of both compounds prove that all the XeF2 molecules are symmetrical. Four XeF2 molecules per formula unit act as bridges between Ba centres, while one molecule is held in the structure by electrostatic forces. In the series of compounds [Ba(XeF2)5](AF6)2 with A = As, Sb, Ru, Nb, the influence of the anions AF6- was analyzed.

Vibrational Raman spectra of liquid and solid ethylene

1970 ◽  
Vol 48 (5) ◽  
pp. 513-520 ◽  
Author(s):  
S. M. Blumenfeld ◽  
S. Paddi Reddy ◽  
H. L. Welsh
Keyword(s):  
Crystal Structure ◽  
Raman Spectrum ◽  
Force Constant ◽  
Raman Spectra ◽  
Short Range ◽  
Short Range Order ◽  
Freezing Point ◽  
Low Frequency ◽  
Intermolecular Force ◽  
Linear Dispersion

The Raman spectra of liquid and solid C2H4 have been examined at a reciprocal linear dispersion of 8 cm−1/mm. The liquid spectrum presents some evidence of short-range order in the liquid near the freezing point. The gerade fundamentals and low-frequency librational modes have been observed in the Raman spectrum of the solid. Analysis of the observed splitting in terms of H-atom repulsion indicates that the intermolecular force constant is 950 dyn/cm, and the crystal structure is P21/n1. The origin of other observed structures is uncertain.

Synthese und Kristallstruktur von TlI3(3-CH3C5H4NO)2, einem Komplex des dreiwertigen Thalliums / Synthesis and Crystal Structure of TlI3(3-CH3C5H4NO)2, a Complex of Trivalent Thallium

1984 ◽  
Vol 39 (9) ◽  
pp. 1159-1161 ◽  
Author(s):  
M. R. Bermejo ◽  
A. Castineiras ◽  
M. Gayoso ◽  
W. Hiller ◽  
U. Englert ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Equatorial Plane ◽  
Lattice Parameters ◽  
Trigonal Bipyramid ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
Twofold Axis ◽  
Centrosymmetric Space Group ◽  
Distorted Trigonal Bipyramid ◽  
Methyl Pyridine

TlI3(CH3C5H4NO)2 is obtained in acetonitrile by the reaction of TlI with iodine and 3-methyl- pyridine-N-oxide. It crystallizes monoclinic in the centrosymmetric space group C2/c with lattice parameters at 190 K, a = 1756.5(8), b = 780.7(5), c = 1397.1(4) pm, β = 110.26(3)° and Z = 4. The structure consists of monomeric complexes, in which the Tl atom shows a fivefold coordina­tion in form of a slightly distorted trigonal bipyramid, the I atoms being located in the equatorial plane. The symmetry of the complex is C2 whereby the Tl atom and one of the I atoms occupy the twofold axis.

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