4H-imidazo[1,2-a]imidazoles for electronic applications

A compound of the formula (I)

• wherein
• X6 is —N═ and X7 is —NR1—, or
• X7 is ═N— and X6 is —NR1—,
• R1 is a group of formula -A1-(A2)p-(A3)q-(A4)r-R6,
• p is 0, or 1, q is 0, or 1, r is 0, or 1,
• A1, A2, A3 and A4 are independently of each other a C6-C24 arylene group, which can optionally be substituted by G, or a C2-C30 heteroarylene group, which can optionally be substituted by G;
• wherein
• the groups A1, A2, A3 and A4 may be interrupted by one, or more groups of (SiR7R8)—;
• R2, R3, R4 and R5 are independently of each other H, a C1-C25 alkyl group, which can optionally be substituted by E and or interrupted by D;
• a C6-C24 aryl group, which can optionally be substituted by G, or a C2-C30 heteroaryl group, which can optionally be substituted by G;
• R6 is H, a group —(SiR20R21R22), a C6-C24 aryl group, which can optionally be substituted by G, or a C2-C30 heteroaryl group, which can optionally be substituted by G;
• R7 and R8 are independently of each other a C1-C25 alkyl group, or a C6-C24 aryl group, which can optionally be substituted by G;
• X1 is CR9,
• X2 is N, or CR10,
• R9 is H, a C1-C16 alkyl group, which can optionally be substituted by E and or interrupted by D, a C18-C25 alkyl group, which can optionally be substituted by E and or interrupted by D, a C6-C24 aryl group, which can optionally be substituted by G, or a C2-C30 heteroaryl group, which can optionally be substituted by G;
• R10 is H, a C1-C25 alkyl group, which can optionally be substituted by E and or interrupted by D;
• a C6-C24 aryl group, which can optionally be substituted by G, or a C2-C30 heteroaryl group, which can optionally be substituted by G;
• R9 and R10 optionally together form a ring, which can optionally be substituted,
• R20, R21 and R22 are independently of each other a C1-C25 alkyl group, or a C6-C24 aryl group, which can optionally be substituted by G;
• D is —CO—, —COO—, —S—, —SO—, —SO2—, —O—, —NR65—, —SiR70R71—, —POR72—, —CR63═CR64—, or —C≡C—,
• E is —OR69, —SR69, —NR65R66, —COR68, —COOR67, —CONR65R66, —CN, or halogen,
• G is E, or a C1-C18 alkyl group, a C6-C24 aryl group, a C6-C24 aryl group, which is substituted by F, C1-C18 alkyl, C1-C18 alkyl which is interrupted by —O—, a C2-C30 heteroaryl group, or a C2-C30 heteroaryl group, which is substituted by F, C1-C18 alkyl, C1-C18 alkyl which is interrupted by —O—;
• R63 and R64 are independently of each other C6-C18 aryl;
• C6-C18 aryl which is substituted by C1-C18 alkyl or C1-C18 alkoxy;
• C1-C18 alkyl;
• or C1-C18 alkyl which is interrupted by —O—;
• R65 and R66 are independently of each other a C6-C18 aryl group;
• a C6-C18 aryl which is substituted by C1-C18 alkyl, or C1-C18 alkoxy;
• a C1-C18 alkyl group;
• or a C1-C18 alkyl group, which is interrupted by —O—;
• R65 and R66 optionally together form a five or six membered ring,
• R67 is a C6-C18 aryl group;
• a C6-C18 aryl group, which is substituted by C1-C18 alkyl, or C1-C18 alkoxy;
• a C1-C18 alkyl group;
• or a C1-C18 alkyl group, which is interrupted by —O—,
• R68 is H;
• a C6-C18 aryl group;
• a C6-C18 aryl group, which is substituted by C1-C18 alkyl, or C1-C18 alkoxy;
• a C1-C18 alkyl group;
• or a C1-C18 alkyl group, which is interrupted by —O—,
• R69 is a C6-C18 aryl;
• a C6-C18 aryl, which is substituted by C1-C18 alkyl, or C1-C18 alkoxy;
• a C1-C18 alkyl group;
• or a C1-C18 alkyl group, which is interrupted by —O—R70 and R71 are independently of each other a C1-C18 alkyl group, a C6-C18 aryl group, or a C6-C18 aryl group, which is substituted by C1-C18 alkyl, and
• R72 is a C1-C18 alkyl group, a C6-C18 aryl group, or a C6-C18 aryl group, which is substituted by C1-C18 alkyl,
• wherein when X1 is CR9 and X2 is CR10, then at least one of R9 and R10 is a C2-C30 heteroaryl group or R9 and R10 join to form an aryl or heteroaryl ring with the proviso that the