Compounds for optically active devices

A compound of formula (I)

• wherein
• X is O, S or NR0,
• X0 is O or S,
• d is 0 or 1,
• is selected from the group consisting of
• wherein * denotes a linkage to [—R2—R1],
• R is at each occurrence independently H, F, OH, a linear or branched alkyl group having 1 to 4 C atoms, a linear or branched hydroxyalkyl group having 1 to 4 C atoms or a linear or branched partially or fully fluorinated alkyl group having 1 to 4 C atoms,
• R′ is at each occurrence independently H, F, a linear or branched, non-halogenated, partially or completely halogenated alkyl group having 1 to 20 C atoms, a linear or branched hydroxyalkyl group having 1 to 20 C atoms, a non-halogenated, partially or completely halogenated cycloalkyl group having 3 to 6 C atoms, a linear or branched, non-halogenated, partially or completely halogenated alkoxy group having 1 to 20 C atoms, a linear or branched, non-halogenated, partially or completely halogenated thioalkyl group having 1 to 20 C atoms,
• R0 is at each occurrence independently a linear or branched alkyl group having 1 to 10 C atoms or a cycloalkyl group having 3 to 6 C atoms,
• R1 is a polymerizable group selected from the group consisting of alkenyl groups of formula (1), trialkoxysilyl groups, dialkoxyalkylsilyl groups, silyl groups of formula (2), silyl groups of formula (3) and silyl groups of formula (4),
• wherein
• X4 is O, S, C(═O), or C(═O)O,
• R7, R8, R9 are at each occurrence independently of each other H, F, a linear or branched, non-fluorinated, partially or completely fluorinated alkyl having 1 to 20 C atoms or aryl with 6 to 14 C atoms,
• c is 0 or 1,
• * denotes a linkage to [—R2—];
• wherein, in the trialkoxysilyl groups and dialkoxyalkylsilyl groups the alkyl and/or alkoxy groups are each independently linear or branched having 1 to 6 C atoms;
• wherein
• alkyl means at each occurrence independently of each other a linear or branched alkyl group having 1 to 6 C atoms, and
• * denotes at each occurrence independently of each other a linkage to [—R2—],
• —R2— is (C(R)2)o—, —(C(R)2)p—X1—(C(R)2)q—(X2)s—(C(R)2)r—(X3)t—(C(R)2)u—, or a cycloalkylene group having 5 or 6 C atoms substituted with at least one R which is different from H,
• o is 1 to 20,
• X1, X2, X3 are at each occurrence independently O, S or NR0,
• s, t are at each occurrence independently is 0 or 1,
• p, q are at each occurrence independently 1 to 10,
• r, u are at each occurrence independently 0 to 10,
• wherein the overall number of atoms for —(C(R)2)p—X1—(C(R)2)q—(X2)s—(C(R)2)r—(X3)t—(C(R)2)u— is up to 20 atoms,
• R3, R4, R5, R6 are at each occurrence independently R′.