Compound of general formula I characterized in that Q is O or S, preferably Q is S; R1 is selected from the group consisting of alkoxy, alkyl, fluorinated alkyl, partially fluorinated alkyl, and aryl; X1 and X2 are independently of one another N or C-R4; where R4 is selected from the group consisting of H, halogen, alkoxy, branched or linear, cyclic or open-chain alkyl, alkenyl, and aryl, wherein H may in each case be substituted; A1 is a group having the formula Ia where * denotes the point of attachment to the compound of the general formula I; Z1 is selected from the group consisting of O, S, Se, and N-R5, where R5 is selected from the group consisting of H, alkoxy, alkyl, fluorinated alkyl, partially fluorinated alkyl, and aryl; Y1 is N or C-R6, where R6 is selected from the group consisting of H, halogen, alkoxy, branched or linear, cyclic or open-chain alkyl, alkenyl, and aryl, wherein H may in each case be substituted; Y2 is N or C-R7, where R7 is selected from the group consisting of H, halogen, alkoxy, branched or linear, cyclic or open-chain alkyl, alkenyl, and aryl, wherein H may in each case be substituted; and where R6 and R7 may be homocyclically or heterocyclically linked to one another in the form of a ring structure; R2 is selected from the group consisting of H, halogen, alkoxy, alkyl, fluorinated alkyl, partially fluorinated alkyl, branched or linear, cyclic or open-chain alkyl, amino, aryl, heteroaryl, alkenyl, and an electron-withdrawing alkyl group having at least one C=C double bond, wherein H may be substituted by CN or F; A2 is a group having the formula Ib where * denotes the point of attachment to the compound of the general formula I; Z2 is selected from the group consisting of O, S, Se, and N-R8, where R8 is selected from the group consisting of H, alkoxy, alkyl, fluorinated alkyl, partially fluorinated alkyl, and aryl; Y3 is N or C-R9, where R9 is selected from the group consisting of H, halogen, alkoxy, branched or linear, cyclic or open-chain alkyl, alkenyl, and aryl, wherein H may in each case be substituted; Y4 is N or C-R10, where R10 is selected from the group consisting of H, halogen, alkoxy, branched or linear, cyclic or open-chain alkyl, alkenyl, and aryl, wherein H may in each case be substituted; and where R9 and R10 may be homocyclically or heterocyclically linked to one another in the form of a ring structure; and R3 is selected from the group consisting of H, halogen, alkoxy, alkyl, fluorinated alkyl, partially fluorinated alkyl, branched or linear, cyclic or open-chain alkyl, amino, aryl, heteroaryl, alkenyl, and an electron-withdrawing alkyl group having at least one C=C double bond, wherein H may be substituted by CN or F. Q is O or S, preferably Q is S; R1 is selected from the group consisting of alkoxy, alkyl, fluorinated alkyl, partially fluorinated alkyl, and aryl; X1 and X2 are independently of one another N or C-R4; where R4 is selected from the group consisting of H, halogen, alkoxy, branched or linear, cyclic or open-chain alkyl, alkenyl, and aryl, wherein H may in each case be substituted; A1 is a group having the formula Ia where * denotes the point of attachment to the compound of the general formula I; Z1 is selected from the group consisting of O, S, Se, and N-R5, where R5 is selected from the group consisting of H, alkoxy, alkyl, fluorinated alkyl, partially fluorinated alkyl, and aryl; Y1 is N or C-R6, where R6 is selected from the group consisting of H, halogen, alkoxy, branched or linear, cyclic or open-chain alkyl, alkenyl, and aryl, wherein H may in each case be substituted; Y2 is N or C-R7, where R7 is selected from the group consisting of H, halogen, alkoxy, branched or linear, cyclic or open-chain alkyl, alkenyl, and aryl, wherein H may in each case be substituted; and where R6 and R7 may be homocyclically or heterocyclically linked to one another in the form of a ring structure; R2 is selected from the group consisting of H, halogen, alkoxy, alkyl, fluorinated alkyl, partially fluorinated alkyl, branched or linear, cyclic or open-chain alkyl, amino, aryl, heteroaryl, alkenyl, and an electron-withdrawing alkyl group having at least one C=C double bond, wherein H may be substituted by CN or F; A2 is a group having the formula Ib where * denotes the point of attachment to the compound of the general formula I; Z2 is selected from the group consisting of O, S, Se, and N-R8, where R8 is selected from the group consisting of H, alkoxy, alkyl, fluorinated alkyl, partially fluorinated alkyl, and aryl; Y3 is N or C-R9, where R9 is selected from the group consisting of H, halogen, alkoxy, branched or linear, cyclic or open-chain alkyl, alkenyl, and aryl, wherein H may in each case be substituted; Y4 is N or C-R10, where R10 is selected from the group consisting of H, halogen, alkoxy, branched or linear, cyclic or open-chain alkyl, alkenyl, and aryl, wherein H may in each case be substituted; and where R9 and R10 may be homocyclically or heterocyclically linked to one another in the form of a ring structure; and R3 is selected from the group consisting of H, halogen, alkoxy, alkyl, fluorinated alkyl, partially fluorinated alkyl, branched or linear, cyclic or open-chain alkyl, amino, aryl, heteroaryl, alkenyl, and an electron-withdrawing alkyl group having at least one C=C double bond, wherein H may be substituted by CN or F.