The infrared spectra of C2H2 and C2D2: An experiment on molecular structure and symmetry

1966 ◽  
Vol 43 (12) ◽  
pp. 644 ◽  
Author(s):  
L. Willard Richards
Keyword(s):  
Molecular Structure ◽  
Infrared Spectra

scholarly journals Influence of alkyl chain length and fluorine atoms substitution on infrared spectra of chiral liquid crystalline esters

2017 ◽  
Vol 66 (3) ◽  
pp. 63-74
Author(s):  
Anna Drzewicz ◽  
Marzena Tykarska ◽  
Magdalena Żurowska
Keyword(s):  
Molecular Structure ◽  
Infrared Spectroscopy ◽  
Liquid Crystals ◽  
Infrared Spectra ◽  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Rigid Core ◽  
Helicoidal Structure

The infrared spectra were registered for series of three-ring liquid crystalline esters, differing in the structure of alkyl chain, in the substitution of benzene ring by fluorine atoms and in the type of helicoidal structure in the chiral smectic CA phase with antiferroelectric properties. The influence of molecular structure on the shift of signals coming from carbonyl group, located in the rigid core, was observed. Keywords: liquid crystals, helicoidal structure, chiral smectic CA phase, antiferroelectric crystalline phase, infrared spectroscopy

scholarly journals Molecular structure and infrared spectra of the monomeric 3-(methoxy)-1,2-benzisothiazole 1,1-dioxide (methyl pseudosaccharyl ether)

2008 ◽  
Vol 876 (1-3) ◽  
pp. 77-85 ◽  
Author(s):  
Agnieszka Kaczor ◽  
Rui Almeida ◽  
Andrea Gómez-Zavaglia ◽  
Maria de Lurdes S. Cristiano ◽  
Rui Fausto
Keyword(s):  
Molecular Structure ◽  
Infrared Spectra

Synthesis, structure, and properties of poly-bis(μ-diethylphosphinato)copper(II)

1982 ◽  
Vol 60 (15) ◽  
pp. 2017-2022 ◽  
Author(s):  
Katherine W. Oliver ◽  
Steven J. Rettig ◽  
Robert C. Thompson ◽  
James Trotter
Keyword(s):  
Molecular Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Infrared Spectra ◽  
Field Model ◽  
Direct Methods ◽  
Coordination Geometry ◽  
Structure And Properties ◽  
Tetrahedral Coordination ◽  
Full Matrix

The preparation, magnetic properties, electronic and infrared spectra, and molecular structure of poly-bis(μ-diethylphosphinato)copper(II) are described. Crystals of poly-bis(μ-diethylphosphinato)copper(II) are triclinic, a = 7.700(1), b = 9.807(1), c = 10.101(1) Å, α = 90.48(1), β = 104.77(1), γ = 112.21(1)°, Z = 2, space group [Formula: see text]. The structure was solved by direct methods and was refined by full-matrix least-squares procedures to R = 0.025 and Rw = 0.032 for 3491 reflections with I ≥ 3σ(I). The polymeric structure consists of Cu atoms with flattened tetrahedral coordination geometry linked by double phosphinate bridges. Mean bond lengths (corrected for libration) are: Cu—O, 1.924(3), P—O, 1.526(4), and P—C, 1.807(4) Å. Assignment of the electronic spectrum using a crystal field model gives Dq = 1665 cm−1 and Cp = 1800 cm−1. Magnetic susceptibility studies give no evidence for magnetic concentration over the temperature range 80 to 300 K.

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