Patent ID: 7471437

Claim:
An electrochromic material comprising a substituted-1,1-dioxo-thiopyran of the general structure I: wherein: X is carbon, nitrogen, oxygen, or sulfur; n is 0, 1 or 2; R 3 is independently an electron withdrawing group or a substituted or unsubstituted alky or aryl group; R 3 and R 5 each independently represent a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group; and R 2 and R 4 each independently represent hydrogen, or an electron withdrawing group, or a substituted or unsubstituted alkyl group, provided at least one of R 1 through R 5 comprises a carboxlate, saliclate, or phosphonate.