Thermal hysteresis in dithiadiazolyl and dithiazolyl radicals induced by supercooling of paramagnetic liquids close to room temperature: a study of F3CCNSSN and an interpretation of the behaviour of F3CCSNSCCF3.
The trifluoromethyl-substituted dithiadiazolyl and dithiazolyl radicals, F3CCNSSN (1) and F3CCSNSCCF3 (2) associate through pi*-pi* covalent and electrostatic S delta+...N delta- interactions in the solid state, but melt with a dramatic volume increase to generate paramagnetic liquids; these radicals exhibit thermal hysteresis, which arises through a meta-stable super-cooled liquid state, close to room temperature.
Du
Hongbin
H
Department of Chemistry, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 6E2.
Haddon
Robert C
RC
Krossing
Ingo
I
Passmore
Jack
J
Rawson
Jeremy M
JM
Schriver
Melbourne J
MJ