Single-crystal EPR and optical absorption investigations of the ozonide radical in crystalline solids alkali metal and ammonium ozonides, MO3 (M = potassium(1+), rubidium(1+), cesium(1+), tetramethylammonium(1+), and tetraethylammonium(1+))

1991 ◽  
Vol 30 (8) ◽  
pp. 1923-1926 ◽  
Author(s):  
G. Steffen ◽  
W. Hesse ◽  
M. Jansen ◽  
D. Reinen
Keyword(s):  
Optical Absorption ◽  
Alkali Metal ◽  
Single Crystal ◽  
Crystalline Solids

Optical Absorption of CuInSe2 in Bulk Single Crystal

1981 ◽  
Vol 108 (1) ◽  
pp. K19-K22 ◽  
Author(s):  
C. Rincón ◽  
J. González ◽  
G. Sanchez Perez
Keyword(s):  
Optical Absorption ◽  
Single Crystal ◽  
Bulk Single Crystal

Compounds of the triphenyltin(II) ion

1981 ◽  
Vol 34 (6) ◽  
pp. 1337 ◽  
Author(s):  
WR Bullard ◽  
MJ Taylor
Keyword(s):  
Alkali Metal ◽  
Vibrational Spectra ◽  
Liquid Ammonia ◽  
Crystalline Solids ◽  
Ionic Compounds ◽  
Metal Derivatives

Ionic compounds R+SnPh3-, where R = Me4N, (Ph3P)2N, Na(15-crown-5) or K(18-crown-6), are prepared from alkali metal derivatives, Ph3SnM, by reactions in liquid ammonia which yield the products as yellow crystalline solids, soluble in a weakly basic solvent. N.m.r. and vibrational spectra of the Ph3Sn- anion, a pyramidal species with C3V symmetry, and the cationic complexes [M(crown)]+, are reported and assigned.

H-bonding scheme in allactite: a combined single-crystal X-ray and neutron diffraction, optical absorption spectroscopy, FTIR and EPMA-WDS study

2016 ◽  
Vol 80 (5) ◽  
pp. 719-732 ◽  
Author(s):  
G. Diego Gatta ◽  
Ferdinando Bosi ◽  
Maria Teresa Fernandez Diaz ◽  
Ulf Hålenius
Keyword(s):  
Neutron Diffraction ◽  
Optical Absorption ◽  
Single Crystal ◽  
Absorption Spectroscopy ◽  
Structure Refinement ◽  
Site Occupancy ◽  
Optical Absorption Spectroscopy ◽  
Hydroxyl Groups ◽  
X Ray ◽  
Bonding Scheme

AbsatractThe crystal chemistry of allactite from Långban, Värmland (Sweden) was investigated by single-crystal X-ray and neutron diffraction, optical absorption spectroscopy, Fourier-transform infra-red spectroscopy (FTIR) and electron microprobe analysis by wavelength-dispersive spectroscopy (EPMA-WDS). The optical spectra indicate the presence of Mn in valence state 2+ only. Assuming 16 O atoms per formula unit, arsenic as As5+and the (OH) content calculated by charge balance, the resulting formula based on the EPMA-WDS data is (Mn2+6.73Ca0.13Mg0.12Zn0.02)∑7.00(As5+)2.00O16H8, very close to the ideal composition Mn7(AsO4)2(OH)8. In the unpolarized FTIR spectrum of allactite, fundamental (OH)-stretching bands are observed at 3236, 3288, 3387, 3446, 3484, 3562 and 3570 cm–1, suggesting that a number of OH environments, with different hydrogen bond strengths, occur in the structure. The neutron structure refinement shows that four independent H sites occur in allactite with full site occupancy, all as members of hydroxyl groups. The complex hydrogen-bonding scheme in the allactite structure is now well defined, with at least nine hydrogen bonds energetically favourable with mono-, bi- and trifurcated configurations.

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