Spectroscopic and calorimetric studies of proton tunneling and deuteration-induced phase transition in crystalline iodo-hydroxyphenalenone and iodo-deuteroxyphenalenone

• Published in: Chemical physics letters Vol. 342; no. 1; pp. 22 - 26
• Main Authors: Matsuo, Takasuke, Baluja, Shipra, Koike, Yojiro, Ohama, Mitsuo, Mochida, Tomoyuki, Sugawara, Tadashi
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 06.07.2001; Elsevier Science
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Infrared and raman spectra and scattering; Lattice dynamics; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Organic compounds, polymers; Physics; Quantum tunneling of defects; Statistical mechanics of lattice vibrations and displacive phase transitions; Transport properties of condensed matter (nonelectronic); Protons; Specific heat; Phase transformations; Tunnel effect; Vibrational modes; Phenalene derivatives; Isotopic species; Infrared spectra; Experimental study; Statistical mechanics; Organic compounds

Far-infrared spectra and molar heat capacities of 5-iodo-9-hydroxyphenalenone (IHP) and its deuterated analog (IDP) were measured at temperatures between 5 K and ambient temperature. A strong absorption at 68 cm −1 in IHP, for which the counterpart is missing in IDP, was assigned to the proton tunne...