Electrochromic liquid crystal on the basis of substituted phthalocyanines.

摘要

1. Orgono-metallic composition of the formula : [(R')n (R'')m Por]p Me in which : - Por represents a radical selected from amongst the following radicals : - phthalocyanine, - porphyrine, - tetraazaporphyrine, - tetra(naphto)tetraazaporphyrine, - tetra(phenanthro) tetraazaporphyrine, - R' and R'' represent identical or different radicals attached to the peripheral carbon atoms of the Por ring ; - R' is a radical of aliphatic character of which the carbon chain may interrupted by one or several hetero-atoms selected from amongst O, S, N and Se or by a phenylene radical, the carbon chain containing at least six atoms ; - R'' is a cyano or halo radical ; - n and m are integers, the sum of which is equal to at least 4 and at most equal to the number of peripheral carbon atoms in the Por ring ; - n is equal to at least 4, - p is equal to 1 or 2 - Me is a metal. with the limitation that when p is equal to 1, Me is selected from the group constituted by the group of lanthanides and yttrium, uranium, thorium, tin, platinium, palladium, manganese and lead ; and when Por is a tetra (naphtho) tetraazaporphyrine n is greater than 4.