Abstract
The X-ray structural analysis of diglycine hydrogen selenite has been carried out. The substance crystallizes in the monoclinic space groupP21/c,a=12.2651(7),b=4.8079(6),c=19.9550(10) Å,β=122.745(4)°,V=989.73(14) Å3,Z=4,R=0.0338 for 1647 observed reflections. The crystal structure is formed by zwitterions of glycine (CH2NH+3COO−), glycinium cations (CH2NH+3COOH), and hydrogen selenite anions (HSeO−3) connected by an extensive system of hydrogen bonds. The FTIR and FT Raman spectra of natural and deuterated diglycine hydrogen selenite and monoglycine–selenious acid crystals were recorded and interpreted. The FTIR spectra were studied down to a temperature of 90 K. DSC measurements for both compounds were carried out in the temperature range 95–380 K. No phase transition was found in this temperature range by DSC and FTIR. The existence of ferroelectric properties of diglycine hydrogen selenite and monoglycine–selenious acid crystals can be excluded because of the centrosymmetry of their space groups.
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