Fluorene derivatives

A compound comprising one or more structural elements of the following formula

• wherein
• B′ is —(B)q— or —(B)q—R3,
• B is —C≡C—, —CY1═CY2— or an optionally substituted aromatic or heteroaromatic group,
• q is an integer from 1 to 10,
• Y1,2 are independently of each other H, F, Cl, CN or R0,
• A1-4 are independently of each other identical or different groups selected from non-aromatic, aromatic or heteroaromatic carbocyclic or heterocyclic groups, which are optionally substituted by one or more groups R1,
• Z1,2 are independently of each other identical or different groups selected from —O—, —S—, —CO—, —COO—, —OCO—, —O—COO—, —CO—NR0—, —NR0—CO—, —NR0—CO—NR0—, —OCH2—, —CH2O—, —SCH2—, —CH2S—, —CF2O—, —OCF2—, —CF2S—, —SCF2—, —CH2CH2—, —(CH2)3—, —(CH2)4—, —CF2CH2—, —CH2CF2—, —CF2CF2—, —CH═CH—, —CY1═CY2—, —CH═N—, —N═CH—, —N═N—, —CH═CR0—, —C≡C—, —CH═CH—COO—, —OCO—CH═CH—, CR0R00 or a single bond,
• R0 and R00 are independently of each other H or alkyl with 1 to 12 C-atoms,
• m and n are independently of each other 0, 1, 2, 3 or 4,
• R1-3 are independently of each other identical or different groups selected from H, halogen, —CN, —NC, —NCO, —NCS, —OCN, —SCN, —C(═O)NR0R00, —C(═O)X0, —C(═O)R0, —NH2, —NR0R00, —SH, —SR0, —SO3H, —SO2R0, —OH, —NO2, —CF3, —SF5, P-Sp-, optionally substituted silyl, or carbyl or hydrocarbyl with 1 to 40 C atoms that is optionally substituted and optionally comprises one or more hetero atoms, or denote P or P-Sp-, or are substituted by P or P-Sp-, wherein the compounds comprise at least one group R1-3 denoting or being substituted by P or P-Sp-,
• P is a polymerizable group,
• Sp is a spacer group or a single bond,
• and wherein the fluorene group is optionally substituted by one or more groups R1.