Synthesis of (TDAE)(O2SSO2)(s) and Discovery of (TDAE)(O2SSSSO2)(s) Containing the First Polythionite, [O2SSSSO2]2鈥?/sup>

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• 作者：Pablo Bruna ; Andreas Decken ; Scott Greer ; Friedrich Grein ; H. Donald B. Jenkins ; Birgit Mueller ; Jack Passmore ; Tressia A. P. Paulose ; J. Mikko Rautiainen ; Stephanie Richardson ; Melbourne J. Schriver
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：December 2, 2013
• 年：2013
• 卷：52
• 期：23
• 页码：13651-13662
• 全文大小：551K
• 年卷期：v.52,no.23(December 2, 2013)
• ISSN：1520-510X

文摘

Gaseous SO₂ reacts with tetrakis(dimethylamino)ethylene (TDAE) in acetonitrile in a 2:1 stoichiometric ratio to give analytically pure insoluble purple (TDAE)(O₂SSO₂) (1) in about 80% yield. Crystals of (TDAE)(O₂SSSSO₂) (2) were obtained from orange solution over the purple solid. The Raman spectrum of [TDAE]²⁺ was established using (TDAE)(A) salts [A = 2Br^{鈥?/sup>, 2Br鈥?/sup>路2H₂O (X-ray), 2[Br₃]鈭?/sup> (X-ray)]. Vibrational spectroscopy showed that [O₂SSO₂]2鈥?/sup> in 1 has C_2h geometry. The X-ray structure of 2 showed that it contained [O₂SSSSO₂]2鈥?/sup>, the first example of a new class of sulfur oxyanions, the polythionites. The geometry of [O₂SSSSO₂]2鈥?/sup> consists of S₂ with an S鈥揝 bond length of 2.003(1) 脜 connected to two terminal SO₂ moieties by much longer S鈥揝 bonds of 2.337(1) 脜. Calculations (B3PW91/6-311+G(3df)) show that the structural units in [O₂SSSSO₂]2鈥?/sup> are joined by the interaction of electrons in two mutually perpendicular 蟺* SOMOs of the triplet-state diradical S₂ with unpaired electrons in the 蟺*-antibonding orbitals of the two terminal [SO₂]鈥⑩€?/sup> and polarized to delocalize the negative charge equally onto the three fragments. Thermodynamic estimates show 2 to be stable with respect to loss of sulfur and formation of 1, in contrast to [O₂SSSSO₂]2鈥?/sup> salts of small cations that are unstable toward the related dissociation. Reaction of TDAE with an excess of liquid SO₂ led to (TDAE)(O₃SOSO₃)路SO₂ (preliminary X-ray, Raman), (TDAE)(O₃SSSSO₃)路2SO₂ (preliminary X-ray, Raman), and (TDAE)(O₃SSO₂) (Raman).}