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Ion-molecule reactions and energy-resolved mass spectrometry have been used to determine the structures of the products formed in the reaction of diacetylene radical cation with ethylene in a flowing afterglow-triple quadrupole instrument. The structure of the adduct ion, C6H6·+, has been determined to be that of singly ionized benzene. The reaction thus presents a first example of the ability of diacetylene radical cation to undergo an aromatic ring forming reaction. The other products formed in the reaction are m/z 52, C4H4·+, and m/z 39, C3H3+. Isotopic labeling studies show that C4H4·+ and C3H3+ are formed with nearly statistical hydrogen incorporation, indicating a complex mechanism that scrambles all protons. [Copyright &y& Elsevier]

Three novel copolymers (PT-ID, PT-DTBT, and PT-DTBTID) of benzo[1,2-b:4,5-b′]dithiophene and thiophene with different conjugatedside groups (1,3-indanedione (ID), 4,7-dithien-5-yl-2,1,3-benzodiathiazole(DTBT), and DTBT-ID) were synthesized anddeveloped for polymer solar cell applications. The effects of thedifferent conjugated side groups on the thermal, photophysical, electrochemicaland photovoltaic properties of these copolymers were investigated.As the length of the conjugated side groups increased, the absorptionof the UV–vis region in solution was red-shifted. By changingthe different side groups, the energy levels and band gaps of theresulted copolymers were effectively tuned. The three copolymers exhibitdeep HOMO energy level and relatively high open-circuit voltage (Voc). Bulk heterojunction solarcells with these copolymers as electron donors and (6,6)-phenyl-C61-butyric acid methyl ester (PC61BM) as an electronacceptor exhibit power conversion efficiencies of 2.48%, 4.18% and1.16% for PT-ID, PT-DTBT, and PT-DTBTID, respectively. [ABSTRACT FROM AUTHOR]