Selective chlorination of thiophene-2,3-dithiol with SO2Cl2 generates the corresponding sulfenyl chloride, 2,3-C4H2S(SCl)2. Subsequent condensation with Me3SiN3 yields the thiophenodithiazolylium salt [C4H2S3N]Cl, [TDTA]Cl. The structure of the cation, TDTA+, was established by X-ray diffraction as both its AsF6â and HSO4â salts. Reduction of [TDTA]Cl with Ag powder yields the radical TDTAË which was characterised by X- and Q-band (9 and 34 GHz) EPR and ENDOR studies. The spin density distributions estimated from the EPR/ENDOR measurements were found to be in very good agreement with those determined by DFT (B3LYP/6-31G*) indicating that ca 10% of the spin density is delocalised onto the thiophene ring. Comparison of the spin density distributions in TDTAË and the isoelectronic trithiatriazapentalenyl radical C2S3N3, TTTAË, indicates that replacement of N by CâH leads to a localisation of the spin density on the dithiazolyl ring.
用 SO2Cl2 对
噻吩-2,3-二
硫醇进行选择性
氯化,可生成相应的亚
磺酰氯 2,3-
C4H2S(SCl)2。随后与 Me3SiN3 缩合,可生成
噻吩二
噻唑鎓盐 [ 3N]Cl,即 [TDTA]Cl。通过 X 射线衍射,确定了阳离子 TDTA+ 的 AsF6â 盐和 HSO4â 盐的结构。用
银粉还原 [TDTA]Cl 会产生自由基 TDTAË,并通过 X 波段和 Q 波段(9 和 34 GHz)的 EPR 和 ENDOR 研究对其进行了表征。根据 EPR/ENDOR 测量结果估算出的自旋密度分布与 DFT(B3LYP/6-31G*)确定的自旋密度分布非常一致,表明约有 10% 的自旋密度被分散到
噻吩环上。比较 TDTAË 和等电子三
硫杂三氮杂
环戊烯基 C2S3N3(T
TTAË)中的自旋密度分布表明,用 CâH 替代 N 会导致自旋密度集中在二
噻唑环上。