US 5,037,575 A · Squarilium compound and liquid crystal composition containing the same

Abstract

A squarilium compound represented by the following formula (I) and a liquid crystal composition containing the same are disclosed: ##STR1## wherein X and Y each represents ##STR2## wherein R.sup.1 represents a hydrogen atom, an alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted aralkyl group; R.sup.2, R.sup.3 and R.sup.4 each represents a hydrogen atom, an alkyl group or a substituted or unsubstituted alkoxy group; R.sup.5 represents a hydrogen atom, an alkyl group, an aralkyl group or an aryl group; ring A represents a cyclic alkylene; ring B represents a substituted or unsubstituted aromatic ring; and ring C represents a heterocyclic ring containing one or two of a nitrogen atom, an oxygen atom and a sulfur atom; with proviso that X and Y are not the same when either one of them represents ##STR3## and a liquid crystal composition containing the squarilium compound of the formula (I). The squarilium compound (I) are soluble in a wide variety of solvents and resistant to light, and their maximum absorption wavelengths in these solvents are in the ranges of from 700 to 900 nm.

Claims13

Dependent claims

A squarilium compound represented by the formula (I):

##STR290## wherein X represents ##STR291## and Y represents ##STR292## wherein R.sup.1 represents a hydrogen atom, a C.sub.1-25 alkyl group, a phenyl group which is or is not substituted by a C.sub.1-25 alkyl group, a C.sub.1-13 alkoxy group, or halogen atom, a naphthyl group, a benzyl group which is or is not substituted by an alkyl group, an alkoxy group or a halogen atom, or a phenethyl group;
R.sup.2, R.sup.3 and R.sup.4 each represents a hydrogen atom, a C.sub.1-5 alkyl group or an alkoxy group having total carbon number of 1 to 20 which is or is not substituted by an alkoxy group;
R.sup.5 represents a hydrogen atom or a C.sub.1-13 alkyl group;
ring A represents a cyclic alkylene of 5 or 6 members which is not substituted by an alkyl group;
ring B represents an aromatic ring or an 1,2-alkenylene ring which are or are not substituted by a halogen atom and are not substituted by an alkyl group or alkoxy group;
and ring C represents a heterocyclic ring containing one of a nitrogen atom, an oxygen atom and a sulfur atom and said heterocyclic ring is not substituted by an alkyl group;
with the proviso that X and Y are not the same when either one of them represents ##STR293##

4 more elements

A squarilium compound represented by the formula (I):

##STR294## wherein X represents ##STR295## wherein R.sup.1 represents a hydrogen atom, a C.sub.1-25 alkyl group, a phenyl group or a benzyl group;
R.sup.2, r.sup.3 and R.sup.4 each represents a hydrogen atom, an alkyl group or an alkoxy group having 1 to 13 carbon atoms which is or is not substituted by an alkoxy group;
r.sup.5 represents a hydrogen atom or a C.sub.1-20 alkyl group;
ring A represents a cyclic alkylene of 5 or 6 members and is not substituted by an alkyl group;
ring B represents an 1,2-alkenylene ring of 6 members which is not substituted by an alkyl group or an alkoxy group;
and ring C represents a heterocyclic ring of 5 or 6 members containing one of a nitrogen atom, an oxygen atom and a sulfur atom and said heterocyclic ring is not substituted by alkyl group;
and Y represents ##STR296## wherein R.sup.2, R.sup.3 and ring C are as defined above in this claim.

4 more elements

Dependencies are inferred from the claim text.

Squarilium compound and liquid crystal composition containing the same

Life of this patent

Squarilium compound and liquid crystal composition containing the same

Life of this patent

Abstract

Claims13