| abstract |
PROBLEM TO BE SOLVED To provide a non-thermally reversible photochromic compound. The present invention relates generally to a thermally reversible or non-thermally reversible photochromic compound. The present invention also relates to a photochromic dichroic compound that is thermally reversible or non-thermally reversible. For example, as a non-limiting embodiment, in a thermally reversible photochromic compound adapted to have at least a first state and a second state, in at least one state measured according to a cell method, Compounds having an average absorption greater than 2.3 are provided. Other non-limiting embodiments include (a) at least one photochromic group selected from pyran, oxazine and fulgide and (b) at least one photochromic group and at least one extender L. A photochromic compound is provided. [Selection figure] None |