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Structural control of dithiazolyl radicals: Case studies on 3′- and 4′-cyano-benzo-1,3,2-dithiazolyl, NCC6H3S2N

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Title: Structural control of dithiazolyl radicals: Case studies on 3′- and 4′-cyano-benzo-1,3,2-dithiazolyl, NCC6H3S2N
Authors: Alberola, Antonio1, Burley, Jonathan1, Collis, Rebecca J.1, Less, Robert J.1, Rawson, Jeremy M. jmr31@cus.cam.ac.uk
Source: Journal of Organometallic Chemistry. Jun2007, Vol. 692 Issue 13, p2750-2760. 11p.
Subjects: Radicals (Chemistry), Chemical structure, Spectrum analysis, Electronic structure
Abstract: Abstract: Dithiazolyl radicals with π-stacking motifs have attracted particular interest because of their ability to exhibit spin-switching between diamagnetic distorted π-stacks and paramagnetic regular π-stacked structures through a solid state phase transition. Previous studies indicate that inclusion of electronegative heteroatoms into the backbone favours lamellar structures. This methodology has been extended to the synthesis and characterisation of the title compound, 4′-cyanobenzo-1,3,2-dithiazolyl (4-NCBDTA). Its electronic structure is probed through DFT calculations, cyclic voltammetry and EPR spectroscopy and its crystal structure determined by X-ray powder diffraction at room temperature. Variable temperature SQUID magnetometry reveals that 4-NCBDTA undergoes two phase transitions, each exhibiting bistability; a high temperature phase transition occurs at room temperature (T C↓ =291K, T C↑ =304K, ΔT =13K); whilst the low temperature phase transition occurs below liquid nitrogen temperatures (T C↓ =37K, T C↑ =28K;ΔT =9K). [Copyright &y& Elsevier]
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Database: Engineering Source
Description
Abstract:Abstract: Dithiazolyl radicals with π-stacking motifs have attracted particular interest because of their ability to exhibit spin-switching between diamagnetic distorted π-stacks and paramagnetic regular π-stacked structures through a solid state phase transition. Previous studies indicate that inclusion of electronegative heteroatoms into the backbone favours lamellar structures. This methodology has been extended to the synthesis and characterisation of the title compound, 4′-cyanobenzo-1,3,2-dithiazolyl (4-NCBDTA). Its electronic structure is probed through DFT calculations, cyclic voltammetry and EPR spectroscopy and its crystal structure determined by X-ray powder diffraction at room temperature. Variable temperature SQUID magnetometry reveals that 4-NCBDTA undergoes two phase transitions, each exhibiting bistability; a high temperature phase transition occurs at room temperature (T C↓ =291K, T C↑ =304K, ΔT =13K); whilst the low temperature phase transition occurs below liquid nitrogen temperatures (T C↓ =37K, T C↑ =28K;ΔT =9K). [Copyright &y& Elsevier]
ISSN:0022328X
DOI:10.1016/j.jorganchem.2006.12.020