Daniel A. Straus

San Jose State University, San Jose, California, United States

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Publications (4)17.92 Total impact

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    ABSTRACT: We studied the influence of three bis(terpyridine)-Fe(II) molecules-(X-tpy)2FeCl2 (X = H (1), SAc (2), and 4-phenyl-SAc (3)-on charge storage of a nanowire transistor. The molecules were assembled on the surface of an indium oxide nanowire that forms the conduction channel of the transistor. We found that the charge storage characteristics of such a device strongly depends on the structure of the terpyridine ligand: both retention time (tau) and threshold voltage shift (DeltaVth) increased in the order of 1 < 2 < 3, with tau of 200 s, 12 h, and 287 h and DeltaVth at 4.8, 12, and 28 V, respectively. Furthermore, when we placed the devices with molecules 1 and 3 in a vacuum and recorded the I-Vg curves in a two-day period, we observed higher hysteresis stability for device with molecule 3. For example, DeltaVth was reduced from 4.8 to 1.7 V for the device with molecule 1, while there was no reduction in DeltaVth for the device with molecule 2. These results suggest that thiolate headgroup and/or longer ligand length raises the charge tunneling barrier and results in longer charge retention and wider, more stable memory window. This work demonstrates the potential of chemical synthesis toward tailored device characteristics.
    Journal of the American Chemical Society 06/2004; 126(25):7750-1. DOI:10.1021/ja049368c · 11.44 Impact Factor
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    ABSTRACT: An equimolar mixture of TiF4 and Ti(NMe2)4 in CH3CN gave orange crystals of [TiF2(NMe2)2]4 in good yield. This complex is a cyclic tetramer of TiF2(NMe2)2, where each titanium atom is bonded to one terminal fluoride and terminal amide ligands and to two pairs of bridging fluoride and bridging amide ligands. This complex was employed as a catalyst for polymerizations of ethylene, propylene, and styrene in the presence of methylaluminoxane (MAO); the activity was relatively low for these olefin polymerizations.
    Inorganica Chimica Acta 06/2003; 349:65–68. DOI:10.1016/S0020-1693(02)01515-3 · 2.04 Impact Factor
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    ABSTRACT: The half-open chromocene complex (η5-C5Me5)(η5-2,4-C7H11)Cr (1) has been characterized by X-ray diffraction. It crystallizes in space group P with a = 7.592(2), b = 8.665(6), c = 12.452(14) Å, α = 78.50(8), β = 79.41(6) and γ = 86.72(4)°, Z = 2, V = 787(15) Å3 and Dcalc = 1.19 g/cm3. The structure of this paramagnetic complex reveals a normal U-shaped pentadienyl moiety. Complex 1 is carbonylated in hexane solution under 40 psi CO at room temperature to yield the diamagnetic monocarbonyl adduct (η5-C5Me5)(η5-2,4-C7H11)CrCO (2). The X-ray structure of 2 has also been determined; the complex crystallizes in space group P with a = 8.2810(14), b = 8.8096(17), c = 12.0825(24) Å, α = 97.147(15), β = 91.712(15) and γ = 116.128(14)°, Z = 2, V = 781.7(3) Å3 and Dcalc = 1.319 g/ cm3. The structure of 2 reveals an unusual S-pentadienyl ligand geometry.
    Inorganica Chimica Acta 01/1993; 203(2):179–183. DOI:10.1016/S0020-1693(00)81655-2 · 2.04 Impact Factor
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    ABSTRACT: Potassium t-butoxide promotes alkylation of non-enolizable ketones and aldehydes by zirconocene dialkyls. The reaction proceeds with loss of cyclopentadienide ion from the metal center.
    Tetrahedron Letters 10/1991; 32(42):5893–5894. DOI:10.1016/S0040-4039(00)79419-6 · 2.39 Impact Factor