Semiconductors

A compound of formula (X):

• X3—[Ar3]c—[Ar2]b—[Ar1]a—Y(R1)n1(R2)n2—[Ar1′]a′—[Ar2′—[Ar3′]c′—X4 (X),
• wherein:
• a is 0, 1, 2, or 3;
• a′ is 0, 1, 2, or 3;
• b is 0, 1, 2, or 3;
• b′ is 0, 1, 2, or 3;
• c is 0, 1, 2, or 3;
• c′ is 0, 1, 2, or 3;
• n1 is 1, or 2;
• n2 is 1, or 2;
• Y is a bivalent heterocyclic group, or ring system, which may optionally be substituted;
• Ar1, Ar1′, Ar2, Ar2′, Ar3 and Ar3′ are independently of each other a C6-C24arylen group, which can optionally be substituted, or a C2-C20heteroarylen group, which can optionally be substituted;
• R1 and R2 in each occurrence are independently of each other hydrogen, C5-C12cycloalkyl, COR38, C1-C50alkyl, C3-C50alkenyl, or C3-C50alkynyl, which can optionally be substituted one or more times with C1-C12alkoxy, halogen, C5-C8cycloalkyl, cyano, C6-C24aryl, C2-C20heteroaryl, or a silyl group;
• and/or can optionally be further interrupted by one or more —O—, —S—, —NR39—, —CONR39—, —NR39CO—, —COO—, —CO—, or —OCO—, or a group of formula:
• i is an integer from 1 to 18;
• R70, R71 and R72 are independently of each other hydrogen, C1-C50alkyl, C5-C12cycloalkyl, C6-C24aryl, C2-C20heteroaryl, C2-C50alkenyl or C2-C50alkynyl which can optionally be substituted one or more times with C1-C12alkoxy, halogen (especially F), C5-C8cycloalkyl, cyano, C6-C24aryl, C2-C20heteroaryl, or a silyl group;
• and/or can optionally be further interrupted by one or more —O—, —S—, —NR39—, —CONR39—, —NR39CO—, —COO—, —CO—, or —OCO—;
• with the proviso that at least one of the substituents R70, R71 and R72 is different from hydrogen;
• R38 is C1-C50alkyl, C2-C50alkenyl, C2-C50alkynyl or C1-C50alkoxy, which can optionally be substituted one or more times with C1-C12alkoxy, halogen, C5-C8cycloalkyl, cyano, C6-C24aryl, C2-C20heteroaryl, or a silyl group;
• and/or can optionally be further interrupted by one or more —O—, —S—, —NR39—, —CONR39—, —NR39CO—, —COO—, —CO—, or —OCO—;
• and
• R39 is hydrogen, C1-C25alkyl, C1-C18haloalkyl, C7-C25arylalkyl, or C1-C18alkanoyl;
• X3 and X4 are independently of each other hydrogen, halogen, ZnX12, —SnR207R208R209;
• R207, R208 and R209 are identical or different and are H or C1-C6alkyl, wherein two radicals optionally form a common ring and these radicals are optionally branched or unbranched and X12 is a halogen atom;
• or —OS(O)2CF3, —OS(O)2-aryl, —OS(O)2CH3, —B(OH)2, —B(OY1)2,
• —BF4Na, or —BF4K;
• Y1 is independently in each occurrence a C1-C10alkyl group;
• Y2 is independently in each occurrence an optionally substituted C2-C10alkylene group;
• and
• Y13 and Y14 are independently of each other hydrogen, or a C1-C10alkyl group.