Acta Cryst. (2005). B61, 700-709 [ doi:10.1107/S0108768105026686 ]
Abstract: Crystals of m-carboxyphenylammonium monohydrogenphosphite, C7H8NO
·H2PO
(m-CPAMP), space group P2
/c, grown from aqueous solution undergo a reversible first-order single-crystal phase transition at Tc = 246 (2) K with a hysteresis of 3.6 K. The thermal behaviour of the sample was characterized by differential scanning calorimetry (DSC) experiments. Variations of the unit-cell parameters versus temperature between 100 and 320 K are reported. The transition from the higher-temperature phase (HTP) to the lower-temperature phase (LTP) is characterized by a unit-cell volume contraction of 1.77%. The average structure and unit-cell packing of m-CPAMP at lower temperature (100 K) are reported from accurate X-ray data sets and compared with those of the higher-temperature phase (293 K) in order to investigate the mechanism of the phase transition. The reciprocal lattice reconstruction showed a few very weak satellite reflections which will be discussed in a forthcoming paper.
Keywords: structure analysis; differential scanning calorimetry; X-ray diffraction; phase transition; phosphite.
 |   Structure factor file (CIF format) (167.2 kbytes) |
| Structure factor file (CIF format) (170.6 kbytes) |
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