26 research outputs found

    CONVENIENT SYNTHESES OF 2,2'-BIINDOLE

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    Two new syntheses for 2,2\u27-biindoles are reported. The first uses a palladium catalyzed annulation of a bis(o-iodophenyl)-α,β-diimine. The method employs mild conditions, gives good yields, and is potentially tolerant of a variety of substituent groups. The second method uses a Wittig reaction between a 2-nitrobenzylphosphonium salt and 2-nitrocinnamaldehyde to form 1,4-bis(2-nitrophenyl)butadiene, which followed by triethylphosphite cyclization to give the biindole

    Improved magnetization in sputtered dysprosium thin films

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    50nm thick nanogranular polycrystalline dysprosium thin films have been prepared via ultra-high vacuum DC sputtering on SiO2 and Si wafers. The maximum in-plane spontaneous magnetization at T = 4K was found to be MS4K = 3.28T for samples deposited on wafers heated to 350C with a Neel point of TN = 173K and a ferromagnetic transition at TC = 80K, measured via zero field cooled field cooled magnetization measurements, close to single crystal values. The slightly reduced magnetization is explained in the light of a metastable face centered cubic crystal phase which occurred at the seed interface and granularity related effects, that are still noticeably influential despite an in-plane magnetic easy axis. As deposited samples showed reduced magnetization of MS4K = 2.26T, however their ferromagnetic transition shifted to a much higher temperature of TC = 172K and the antiferromagnetic phase was completely suppressed probably as a result of strain.Comment: 16 pages, 3 figure
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