Crystal structures of 2-(benzene­carbo­thio­yloxy)ethyl benzene­carbo­thio­ate and 2-(benzene­carbo­thio­yloxy)ethyl benzoate

The title compounds, C16H14O2S2 and C16H14O3S, which are monomeric models (models D and E) for a polythio-noester and a poly(ester-co-thio-noester), respectively, crystallize in the space group P21/c and are isostructural with each other. The mol-ecule in each crystal is located on an inversion centre and has an all-trans structure. The asymmetric unit comprises one half-mol-ecule. In the crystal, there are inter-molecular C⋯S contacts [3.391 (3) and 3.308 (3) Å for models D and E, respectively] and C-H⋯π inter-actions, which form a layer structure parallel to the bc plane. The carbonyl and thio-carbonyl groups of the model E compound are each disordered over two equivalent sites about the inversion centre with equal occupancies.