Study of Naphtho[1,8-cd; 4,5c'd'] bis [1,2,6] thiadiazine by gas phase ultraviolet photoelectron spectroscopy.

The ultraviolet photoelectron spectrum of naphtho [1,8-cd; 4,5-c'd']bis [1,2,6]thiadiazine, (NSN-2), is compared with published X-ray photoelectron spectroscopy and ab initio quantum mechanical results. This gas phase analysis completes the picture of the electronic structure and confirms the previously suggested quinonoid type structure for this compound.