(3Z,3′Z)-3,3′-(Hydrazine-1,2-diylidene)bis(indolin-2-one) as a new electron-acceptor building block for donor–acceptor π-conjugated polymers for organic thin film transistors

(3Z,3′Z)-3,3′-(Hydrazine-1,2-diylidene)bis(indolin-2-one) (HBI) is found to be a promising novel building block for polymer semiconductors.