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Thermodynamic study of a phase transition between the ordered and disordered phases and orientational disorder in crystalline p-chloronitrobenzene (2000)

Tozuka, Yoshitaka ; Yamamura, Yasuhisa ; Saito, Kazuya ; [et al.]

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 112 (2000), S. 2355-2360

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ISSN: 1089-7690

Source: AIP Digital Archive

Topics: Physics , Chemistry and Pharmacology

Notes: Heat capacities of the disordered and ordered crystalline phases of p-chloronitorobenzene were measured by adiabatic calorimetry between 6 and 303 K. The disordered phase stable at room temperature shows a glass transition around 245 K, which arises from the freezing of molecular reorientation as evidenced from the magnitude of the residual entropy. The ordered phase that is stable below 279 K was obtained through annealing the disordered phase around 260 K for a long time. The thermodynamic quantities concerning the first-order phase transition between the ordered and disordered phases were determined as Ttrs=279.0 K, ΔtrsH=(4468±5) J mol−1 and ΔtrsS=(16.01±0.05) J K−1 mol−1. Standard thermodynamic functions are tabulated. © 2000 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.480801

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The charge-transfer complex trans-STB–TCNQF4 (2001)

Sato, Akane ; Okada, Mizuho ; Saito, Kazuya ; [et al.]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 57 (2001), S. 564-565

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ISSN: 1600-5759

Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Topics: Chemistry and Pharmacology , Geosciences , Physics

Notes: In the crystal structure of the title charge-transfer complex, namely trans-stilbene–2,2′-(2,3,5,6-tetrafluorobenzene-1,4-diylidene)propanedinitrile (1/1) (trans-STB–TCNQF4), C14H12·C12F4N4, the planar STB and TCNQF4 molecules are stacked alternately. The structure is not isostructural with that of STB–TCNQ. No anomaly was found in the displacement parameters of any atoms, while the bond length of the central C=C moiety was shorter than the corresponding bond in ethylene. This suggests that the central C=C moiety of the STB molecule vibrates with a large amplitude, similar to the case in free STB and STB–TCNQ.