Selective Trapping of Labile S<sub>3</sub> in a Porous
Coordination Network and the Direct X‑ray Observation
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Abstract
S<sub>3</sub> is one of the basic
allotropes of sulfur but is still
a mysterious labile species. We selectively trapped S<sub>3</sub> in
a pore of a thermally stable coordination network and determined S<sub>3</sub> structure by <i>ab initio</i> X-ray powder diffraction
analysis. S<sub>3</sub> in a pore has a <i>C</i><sub>2<i>v</i></sub> bent structure. The network containing trapped S<sub>3</sub> is remarkably stable under ambient conditions and is inert
to photoirradiation. S<sub>3</sub> in the network could be transformed
to S<sub>6</sub> by mechanical grinding or heating in the presence
of NH<sub>4</sub>X (X = Cl or Br). S<sub>6</sub> could be reverse-transformed
to S<sub>3</sub> by photoirradiation. We also determined the structure
of the network containing S<sub>6</sub> by <i>ab initio</i> X-ray powder diffraction analysis