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α,ω‐Di([5]trovacenyl) Sulfides TVC–S n –TVC ( n = 1–4) and TVC–SCH 2 S–TVC: a Study in Intramolecular Communication
Author(s) -
Elschenbroich Christoph,
Lu Feng,
Harms Klaus,
Burghaus Olaf,
Pietzonka Clemens,
Pebler Jürgen
Publication year - 2012
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201200310
Subject(s) - chemistry , intramolecular force , electron paramagnetic resonance , sulfide , sulfur , crystallography , carbon disulfide , photochemistry , stereochemistry , organic chemistry , nuclear magnetic resonance , physics
Abstract The oligosulfur‐bridged dinuclear paramagnetic complexes di([5]trovacenyl) sulfide ( 3 ·· ), di([5]trovacenyl) trisulfide ( 5 ·· ), di([5]trovacenylthio)methane ( 6 ·· ), and di([5]trovacenyl) tetrasulfide ( 7 ·· ) have been prepared by the metathesis reactions of [5]trovacenyllithium with SCl 2 , and [5]lithiotrovacenylthiolate ( 2 · ) with SCl 2 , CH 2 Cl 2 , and S 2 Cl 2 , respectively, in which 2 · was obtained by the reaction of [5]trovacenyllithium with 1 equiv. of elemental sulfur at ambient temperature. Combined with the previously reported di([5]trovacenyl) disulfide ( 4 ·· ), these complexes have been systematically investigated by means of cyclic voltammetry, electron paramagnetic resonance (EPR) spectroscopy, magnetic susceptometry, and/or X‐ray diffraction analysis, which reveal weak antiferromagnetic spin–spin exchange interactions. The monosulfur‐bridged 3 ·· , in particular, displays the strongest intramolecular spin–spin exchange interaction of | J EPR | = 2.8 cm –1 and J χ = –1.39 cm –1 . This study also indicates that with an increasing number of sulfur atoms in the bridge, the intramolecular communication of biradicals throught the 1D saturated sulfur atom bridge significantly weakens both in solution and in the solid state compared to those of unsaturated carbon‐based bridges.