Fabrication and Microstructuring of Hexagonally Ordered Two‐Dimensional Nanopore Arrays in Anodic Alumina
Fabrication and Microstructuring of Hexagonally Ordered Two‐Dimensional Nanopore Arrays in Anodic Alumina
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DOI:
10.1002/(sici)1521-4095(199904)11:6
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发表时间:
1999-04
影响因子:
29.4
通讯作者:
An‐Ping Li;F. Müller;A. Birner;K. Nielsch;U. Gösele
中科院分区:
文献类型:
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作者:
An‐Ping Li;F. Müller;A. Birner;K. Nielsch;U. Gösele
washed three times with water, and dried over MgSO4. After removing the solvent, chromatography is carried out on the residue on neutral alox. First, unreacted compound 4 and monoadduct 8 are eluted with pentane, and then bis-adduct 5 with petrolether/ethyl acetate. (54 %, m.p.: 191 C). H NMR (CDCl3, ppm) 3.64 (s, 8 H, CH2), 4.33 (dd, 2 H, CH), 6.99 (dd, 2 H, CH), 7.14 (s, 8 H, aromatic); C NMR (CDCl3, ppm) 33.72, 54.79, 126.37, 129.22, 134.8, 139.74, 140.72. Compound 2: Compound 5 (0.8 g, 2.64 mmol) and chloranil (1.28 g, 5.28 mmol) are dissolved in toluene (150 mL), and heated for 1.5 h under reflux. After removing the solvent, the residue is purified via chromatography (neutral alox/toluene) (75 %, m.p.: 239 C). H NMR (CDCl3, ppm) 5.33 (dd, 2 H, CH), 7.06 (dd, 2 H, CH), 7.37 (AA¢BB¢, 4 H, aromatic), 7.71 (AA¢BB¢, 4 H, aromatic), 7.73(s, 4 H, aromatic); C NMR (CDCl3, ppm) 50.74, 121.71, 126, 127.92, 132.25, 138.73, 142.66. Compound 6a: A solution of compound 2 (100 mg, 0.32 mmol) and 2,3,4,5-tetrachlorothiophenedioxide (167 mg, 0.64 mmol) in CH2Cl2 (4 mL) is heated for 3 days at 70 C under a pressure of 6 kbar. After the reaction is complete, the solvent is removed under vacuum. Chromatography is carried out on the residue on silica gel with hexane/toluene 4/1 as eluent. The first fraction gives the desired product (75 %). The material can be further purified by recrystallization from dichloroethane/ethyl acetate. H NMR (CD2Cl2, ppm) 3.54 (s, 2 H, CH), 5.13 (s, 2 H, CH), 7.45 (AA¢BB¢, 4 H, aromatic), 7.80 (s, 2 H, aromatic), 7.82 (AA¢BB¢, 4 H, aromatic), 7.86 (s, 2 H, aromatic); C NMR (CD2Cl2, ppm) 48.08, 48.86, 122.91, 123.93, 124.29, 126.24, 126.35, 128.02, 128.07, 131.38, 132.91, 133.07, 137.47, 139.58. Compound 6b: Using the procedure described for the synthesis of compound 6a, compound 6b is obtained in a yield of 70 %. H NMR (CD2Cl2, ppm) 3.58 (s, 2 H, CH), 5.19 (s, 2 H, CH), 7.46 (AA¢¢BB¢, 4 H, aromatic), 7.82 (s, 2 H, aromatic), 7.84 (AA¢BB¢, 4 H, aromatic), 7.86 (s, 2 H, aromatic); C NMR (CD2Cl2, ppm) 49.74, 51.89, 120.49, 122.87, 123.96, 126.22, 126.33, 128.02, 128.08, 128.72, 132.90, 133.06, 137.51, 139.73.