Abstract
Abstract The heat capacity of a 3:1 thiourea-ferrocene channel inclusion compound has been measured with an adiabatic-type calorimeter between 13 and 280 K. Five phase transitions were found at 147.2 (TC1), 159.79(TC2, 171.4(TC3, 185.5(TC4 and 220K(TC5. The enthalpy and entropy asssociated with these transitions have been determined. The two lowest-temperature transitions are responsitble for an order-disorder-type of reorientation of the molecular axis of ferocene in the thiourea host lattice. This reorientational disrodering was proved to proceed in two steps; in the first stage the reorientational motion is excited within the channel plane in a group of, say, three ferrocene molecules as a unit keeping the short-range order while in the second stage this restriction is lifted and the jump process between the channel plane and the channel axis is allowed. The remaining thre phase transitions with small entropy change have been attributed to unkonwn but intrinsic characters of the present clathrate. The dielectric constant measurements revealed no ferroelectric nature. The infrared and Raman spectra have also been recorde. Comparison of the transition mechanisms between solid ferrocene and the present clathrate has been maede.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
