5,5 '-bridged bis(1,2,3-dithiazoles): Spin states and charge-transfer chemistry

Citation
Tm. Barclay et al., 5,5 '-bridged bis(1,2,3-dithiazoles): Spin states and charge-transfer chemistry, INORG CHEM, 40(12), 2001, pp. 2709-2714
Citations number
25
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Inorganic & Nuclear Chemistry
Journal title
INORGANIC CHEMISTRY
ISSN journal
0020-1669 → ACNP
Volume
40
Issue
12
Year of publication
2001
Pages
2709 - 2714
Database
ISI
SICI code
0020-1669(20010604)40:12<2709:5'BSSA>2.0.ZU;2-D
Abstract
Bifunctional 1,2,3-dithiazoles bridged with azine and phenylenediamine spac ers have been prepared, with a view to determining the extent of communicat ion between the two dithiazole rings as a function of the electronic and st eric demands of the bridge. The crystal structure of the closed-shell diazi ne derivative [S2NClC2=NN=C2C-S-2] is rigorously planar. Cyclic voltammetry on this compound indicates two reversible one-electron oxidations. The rad ical cation state has been characterized by EPR spectroscopy and by crystal structure determination of its 1:1 PF6- salt. The latter reveals little in teraction between neighboring radical cations; consistently, the material e xhibits a conductivity of sigma < 10(-5) S cm(-1). Insertion of a phenylene group into the diazine bridge to afford [S2NClC2=NC6H4N=C2ClNS2] leads to significant torsional motion between the phenylene ring and the two end gro ups, as a result of which the two DTA rings are electronically independent; no radical cation state has been observed for this species. Crystal data f or Cl2S4N4C4: a = 5.1469(15), b = 13.343(2), c;= 14.2031(17), orthorhombic, Pbca, Z = 4. Crystal data for Cl2S4N4C4PF6: a = 11.699(4), b = 12.753(5), c = 10.461(4), beta = 112.17(1)degrees monoclinic, C2/c, Z = 4. Crystal dat a for C12S4N4C10H4: a = 3.9477(6), b = 23.790(3), c = 7.3769(9), beta =90.7 93(12)degrees, monoclinic, P2(1)/c, Z = 2.