b-FeOOH nanorods with a tunnel-type structure were synthesized via a hydrothermal method at low temperature and characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), thermal gravimetric analysis (TGA) and galvanostatic tests. From TEM bright-field images, a rodlike morphology with an average diameter of 30 ¡ 5 nm and an average length of 400 nm (aspect ratio # 13) is observed. Electrochemical tests show that thesew nanorods deliver a large discharge capacity of 275 mA h g 21 vs. Li metal at 0.1 mA cm 22 (voltage window 1.5-4.2 V). a-Fe 2 O 3 nanorods with a regular pore structure were obtained by calcining the as-synthesized FeOOH at 520 uC.

No abstract

Seven dicarboxylates of calcium were synthesized. The effect of dicarboxylate on the formation of ␤-form polypropylene was investigated by X-ray diffraction. Calcium pimelate, calcium suberate, calcium phthalate, and calcium terephthalate have been found to be an effective ␤-nucleator.The K x values of the isotatic propylene samples with 0.5 wt % of the nucleators above are 0.95, 0.96, 0.93, and 0.62, respectively. Calcium succinate, calcium adipate, and calcium sebacate behave invalidly on the nucleating of the ␤-phase. We conducted an investigation on the affect of particle shape, crystal form, and crystallinity upon the level of the ␤-form. The X-ray diffraction of the effective nucleators reveals a common character that their first reflection locate at the d-spacing between 10 to 13 Å, indicating structural similarity of the nucleators with ␤-polypropylene. The nucleation mechanism is explained by the cooperative effect of the nonpolar and polar part of nucleating agents in the crystallization of polypropylene.

No abstract

Compound 7: To 6 (2.0 g, 4.4 mmol) in hexane (50 mL), pyridine (py) (1.5 mL, 19 mmol) was added. After stirring for 18 h, the solvent was removed, producing a yellow solid. Recrystallization from hexane yielded yellow crystals (1.5 g, 64 % based on Mo). 1 H NMR (300 MHz, toluene-d 8 ,C): d 0.14 (s, 18H, OSiMe 3 ), 0.43 (s, 9H, NSi a Me 3 ), 0.67 (s, 9H, NSi b Me 3 ), 6.42 (t, 2H, ±NCHCHCH), 6.79 (t, 1H, ±NCHCHCH), 8.44 (d, 2H, ±NCHCHCH); 13 C NMR (75 MHz, toluene-d 8 , ±10 C): d 2.0 (OSiMe 3 ), 2.9 (NSi a Me 3 ), 5.4 (NSi b Me 3 ), 124.8 (±NCHCHCH), 137.7 (±NCHCHCH), 150.7 (±NCHCHCH). MS (EI, 98 Mo): m/z = 379 (M + ± py). Crystal parameters of 7 at 298 K: space group P1, a = 10.499(1), b = 10.974(3), c = 13.001(3) , a = 83.03(2), b = 81.49(2), g = 80.31(2), V = 1453.1(5) 3 , Z = 2, D c = 1.206 g/cm 3 , R f = 0.036, R w = 0.034.

No abstract

No abstract

No abstract