Optical spectroscopic studies of single crystals of tetracyanobenzene - naphthalene doped by pyrene were performed within the temperature range around the ''order-disorder'' phase transition of the host crystal at 73 K. It was established (by the use of phosphorescence and EPR studies) that the geometry of pyrene trap is much different in a low and high temperature phases, thus being sensitive probe of a change of host crystal structure. Activation energy and rate constant describing reorientation of trap structure were obtained.
Phase transition of TCNB-naphthalene crystal probed by the changes of dopant emission.
MANIERO, ANNA LISA
1993
Abstract
Optical spectroscopic studies of single crystals of tetracyanobenzene - naphthalene doped by pyrene were performed within the temperature range around the ''order-disorder'' phase transition of the host crystal at 73 K. It was established (by the use of phosphorescence and EPR studies) that the geometry of pyrene trap is much different in a low and high temperature phases, thus being sensitive probe of a change of host crystal structure. Activation energy and rate constant describing reorientation of trap structure were obtained.
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