|Ultima descărcare din IBN:|
| SM ISO690:2012|
REU, Oleg; OSTROVSKY, Sergei M.; LIU, Shixia; DECURTINS, Silvio; KLOKISHNER, Sophia. Electric Field Control of Valence Tautomeric Transformation in Cobalt Complexes. In: Multidisciplinarity in Modern Science for the Benefit of Society. 21-22 septembrie 2017, Chișinău. Chișinău, Republica Moldova: Inst. de Fizică Aplicată, 2017, p. 37. ISBN 978-9975-9787-1-2.
|Multidisciplinarity in Modern Science for the Benefit of Society 2017|
Masa rotundă "Multidisciplinarity in Modern Science for the Benefit of Society" |
Chișinău, Moldova, 21-22 septembrie 2017
The effects of the applied dc electric field in the optical, magnetic and polarizabilty characteristics of cobalt valence tautomeric complexes demonstrating the interconversion [low-spinCo3+(N^N)(sq1-)(cat2-)]<->[high-spin-Co2+(N^N)(sq1-)2] have been examined. The suggested model allows for ligand-metal and ligand-ligand electron transfer, intramolecular magnetic exchange interactions, the interaction of the Co-ion with full symmetric vibrations of the nearest surrounding as well as the interaction of the complex with the external electric field. In order to describe properly the changes in the intrinsic characteristics of the complex under action of the external electric field the vibronic problem of pseudo-Jahn-Teller effect is solved. The obtained energy levels and corresponding vibronic (hybrid) wave-functions are used for the calculation of the shape of the optical band in the near infrared range as well as of the temperature and field dependence of the molecular magnetic and mean dipole moments. The latter reflects the degree of polarizability of the Co-complex. It has been demonstrated that the external electric field suppresses the electron transfer and leads to the decrease of the magnetic moment of the complex with increase in the field intensity. A significant fall in the intensity of the optical band of the complex in the infrared region can also be observed when the intensity of the electric field grows. Thus, by playing with the direction and intensity of the electric field the critical temperature for the valence tautomeric interconversion, the polarizability, optical and magnetic characteristics can be significantly changed. This offers the unique chance of controlling the optical and magnetic response at the atomic scale by electrical means.