Characterization of the Solid-Solid Phase Transition of Co2(CO)6(AsPh3)2

Inorganic Chemistry

Volumn 37, Issue 24, 1998, Pages 6263-6268

  Macchi, Piero ^a   Garlaschelli, Luigi ^a   Martinengo, Secondo ^a   Sironi, Angelo ^a  

^a UNIVERSITY OF MILAN   (Italy)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0006913338     PISSN: 00201669     EISSN: None     Source Type: Journal    
DOI: 10.1021/ic9807240     Document Type: Article

References (45)

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2. For instance see: (a) Fumagalli, A.; Martinengo, S.; Bernasconi, G.; Ciani, G.; Proserpio, D. M.; Sironi, A. J. Am. Chem. Soc. 1997, 119, 1450. (b) Fumagalli, A.; Martinengo, S.; Tasselli, M.; Ciani, G.; Macchi, P.; Sironi, A. Inorg. Chem. 1998, 57, 2826 and references therein.
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14. Note that two different origin choices can be taken in the R3̄space group. In the HT phase, one is centered on the intramolecular inversion center and the other on the intermolecular center. Thus, the doubling of the c axes can, in principle, speak for the presence in the unit cell of two centrosymmetric molecules not related by any crystallographic symmetry or two noncentrosymmetric molecules related by intermolecular inversion center.
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22. It has been demonstrated that a correction for the nonfiltered λ/2 intensities has an insignificant effect on the results structure refinements and accurate ED analysis. See. (a) Kirschbaum K.; Martin, A., Pinkerton, A. A. J. Appl. Crystallogr. 1997, 30, 514. (b) Macchi, P.; Proserpio, D. M.; Sironi, A.; Soave, R.; Destro, R. J. Appl. Crystallogr. 1998, 583. However, λ/2 contamination has its worst effect in determining the correct cell parameters and space groups (because systematic absences may be violated); thus, a careful correction has been applied to all datasets here.
23. max = 3.5), this phenomenon cannot be neglected. The hypothesis of a hysteresis of the LT phase can be safely excluded on the basis of the second-order character of the transition and because they have been also observed at room temperature for a new crystal (before lowering the temperature). It seems to be more reasonable that these intensities are superstructure reflections due: to a diffuse scattering originated by long-range correlated motions, which violate the local symmetry.
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