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A series of alternating copolymers (PC-AQx,PT-DTAQx,PC-DTAQx,PF-DTAQx and PBDT-DTAQx) (shown in sheme 1) bearing novel planar acenaphtho[1,2-b]-quinoxaline (AQx) or 8,11-di(thiophen-2-yl)acenaphtho[1,2-b]quinoxaline (DTAQx) acceptor cores have been synthesized via Suzuki or Stille coupling reactions.UV-vis