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magnetron sputtering in Ar-H 2 gas mixture. The effects of growth temperature from 150 to 450 C on properties of deposited Si films were investigated at two different hydrogen diluted gases with [H 2 ]/([Ar]+[H 2 ]) of 10% and 50% at 3 Pa. The crystallinity of Si films examined by Raman scattering exhibited higher degrada- tion by lowering growth temperature from 250 to 150 C in low hydrogen diluted......
峰,m/z为质荷比. 1) 2-甲基苯并噁唑(3a),为黄色液体; 1H NMR (400 MHz, CDCl3)δ: 7.96 (d, J = 8.0 Hz, 1H, Ar-H),7.67 (d, J = 8.4 Hz, 1H, Ar-H), 7.47~7.55 (m, 2H, Ar-H), 2.56 (s, 3H, CH3); MS m/z (相对强度): 133 (M+, 100). 2) 2-甲基-5-氯苯并噁唑(3c),为橙黄色固体; mp为54~55 ℃; 1H NMR (400 MHz, CDCl3) δ: 7.89 (d, J1=8.8 Hz,J2=1.6 Hz, 1H, Ar-H), 7.60 (d, J=8.8 Hz, 1H, Ar-H), 7.51 (dd, J=8.8, 1.6 Hz, 1H, Ar-H), 2.56 (s, 3H, CH3); MS m/z (相对......
, Ar-CH=), 7.51 (d, 2H, J=16.0 Hz, Py-CH=), 8.36 (s, 4H, Py-H), 7.51 (s, 4H, Ar-H), 3.92 (s, 6H, OCH3); EA (calculated for C24H28O8N2), mass fraction, %: C 65.21 (65.11), H 4.79 (4.86), N 5.30 (5.42...=16.35 Hz, Py-CH=), 8.46 (s, 4H, Py-H), 7.68 (s, 4H, Ar-H). 2.3 Preparation of complexes of Tb(Ⅲ) Tb2O3 (3.47 g, 9.48 mmol) was dissolved in a solution of hydrochloric acid (15 mL......
(醛基CHO);3 359 cm-1(酚羟基Ar-OH);1 282 cm-1,1 167 cm-1(C- O-C);1 579 cm-1(芳环氢Ar-H);2 981~2 727 cm-1(甲基C-H);1 512 cm-1(亚甲基C-H);1 109 cm-1,1 041 cm-1(苯环1,3和4位取代特征峰);与Sadtler标准谱图一致,可以确定产物为乙基香兰素. 3...接电氧化合成乙基香兰素的合适反应条件:在35 ℃下,以Pt电极为阳极,Ni电极为阴极,0.5 mol/L 3-乙氧基-4-羟基苯乙醇酸+0.25 mol/L硫酸溶液为电解液,控制阳极电位于1.35 V恒电位电解1 h,乙基香兰素的产率可达66.68%,电流效率可达54.72%. 关键词:3-乙氧基-4-羟基苯乙醇酸;乙基香兰素;直接电氧化;极化曲线;循环伏安 中图分类号:O646  ......
spectrum of mPEG-CA (Fig.3(a)). In comparison with the 1H NMR spectrum of compound 2, some new characteristic chemical shifts appear at 7.4, 7.5 and 8.0 (m, Ar-H) in the 1H NMR spectrum of compound 3...%, Fluka in USA) was recrystallized twice from ethanol. Carbon disulfide, magnesium turnings, chloroacetyl chloride, and AA (AR grade) were purchased from Aldrich in USA. CHI with a degree of deacetylation......
under vacuum to give white powder with 78.1% yield, and mp of 82-83 ℃. FT-IR (KBr, cm-1): 1 665 (δ, CH2), 1 042 (Ar- O-), 931 (C-O-C), 865 (γ, -CH2-). 1H NMR (CDCl3): δ=7.00 (s, 2H, Ar-H... sulfone, potassium hydroxide (28 g, 0.5 mol) was added with violently stirring for 0.5 h under nitrogen. 16.53 g hydroquinone and 1.7 g cetyl trimethyl ammonium bromide (CTAB) as the phase transfer......