Structural and spectroscopic studies of the 1:1 complex of 4-nitrophenyl[bis(ethylsulfonyl)]methane–1,5,7triazabicyclo[4.4.0]dec-5-ene

In the crystal of the 1:1 complex of 4-nitrophenyl[bis(diethylsulfonyl)]methane with 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) the proton is transferred from the C–H acid to TBD to yield an ion pair. In the ionic structure the N–H protons of protonated TBD molecule are hydrogen-bonded with sulfonyl oxygens. The lengths of these N–H···O hydrogen bonds are of 2.851(2) and 2.911(2) ?. The structure of the complex in solid is very well reflected in its FT-IR spectrum. On the basis of the FT-IR and 1H NMR studies of the complex, in chloroform, its structure similar to that in the solid state is postulated. In acetonitrile a dissociation of the complex and a formation of a new structure is proposed.