(10, E=S; 11, E=Se). In the case of 3, RA [3].− was detected by EPR spectroscopy as the first representative of tellurium–nitrogen π‐heterocyclic RAs but not isolated. Instead, salt [K(18‐crown‐6)]+2[3‐Te2]2− (12) featuring a new anionic complex with coordinate Te−Te bond was obtained. On contact with air, salt 12 transformed into salt [K(18‐crown‐6)]+2[3‐Te4‐3]2− (13) containing an anionic complex
通过循环伏安法(CV)和DFT计算的手段,我们发现的-2,1,3- benzochalcogenadiazoles受电子性的能力1 - 3(
硫属元素:S,Se和Te,分别地)与增加原子序数的增加
硫属元素。这种趋势是不平凡的,因为它与
硫族元素的电负性和原子电子亲和力相矛盾。与自由基阴离子(RAs)[ 1 ] .-和[ 2 ] .-相比,在CV条件下未通过EPR光谱检测到RA [ 3 ] .-。的
化学还原1 - 3进行与新的热稳定的RA盐[K(THF)] +除已知的盐[K(THF)] + [ 1 ] .-(7)外,还分离出[ 2 ] .-(8)和[K(18-crown-6)] + [ 2 ] .-(9)。 。与空气接触后,RA [ 1 ] .-和[ 2 ] .-在溶液中快速分解,形成阴离子[
ECN] -,这些阴离子以盐的形式分离出来[K(18-crown-6)] + [
ECN] -(10,E =