The crystal lattice of an arachidic (CdA) monolayer on the surface of aqueous subphase in a Langmuir trough was investigated in situ by polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS). The spectra reveal a hexagonal packing of the hydrocarbon chains on the subphase of and 293–283 K. Cooling from 283 to 280 K induces the hexagonal unit cell to transform to an orthorhombic one, as evidenced by the splitting of the scissoring mode. This transition is observed to be reversible with temperature variation within 293–274 K. On the subphase of the crystal lattice of CdA is orthorhombic even at 293 K. The temperature-dependent crystal lattice transition of CdA is compared with the monotonic hexagonal subcell of a cadmium stearate monolayer within 293–274 K and the orthorhombic subcell of a cadmium behenate monolayer within 293–274 K.
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1 February 2001
Letter|
February 01 2001
Crystal lattice of the cadmium alkanoate monolayer at the air/water interface investigated by polarization modulation infrared spectroscopy
Yanzhi Ren;
Yanzhi Ren
Satellite Venture Business Laboratory, Utsunomiya University, Yoto 7-1-2, Utsunomiya, 321-8585, Japan
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Ken-ichi Iimura;
Ken-ichi Iimura
Satellite Venture Business Laboratory, Utsunomiya University, Yoto 7-1-2, Utsunomiya, 321-8585, Japan
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Teiji Kato
Teiji Kato
Satellite Venture Business Laboratory, Utsunomiya University, Yoto 7-1-2, Utsunomiya, 321-8585, Japan
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J. Chem. Phys. 114, 1949–1951 (2001)
Article history
Received:
October 27 2000
Accepted:
November 30 2000
Citation
Yanzhi Ren, Ken-ichi Iimura, Teiji Kato; Crystal lattice of the cadmium alkanoate monolayer at the air/water interface investigated by polarization modulation infrared spectroscopy. J. Chem. Phys. 1 February 2001; 114 (5): 1949–1951. https://doi.org/10.1063/1.1342862
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