The title compound (PhNHNH)2C=OCH3CN has been prepared and characterized by elemental analysis and IR spectrum studies. The single-crystal X-ray structure determination of the title compound was carried out. It crysta...The title compound (PhNHNH)2C=OCH3CN has been prepared and characterized by elemental analysis and IR spectrum studies. The single-crystal X-ray structure determination of the title compound was carried out. It crystallizes in the monoclinic system, space group P21/n with a = 5.7818(2), b = 15.320(1), c = 17.469(1) ? b = 97.476(1)? V = 1534.2(1) 3, Mr = 283.34 (C15H17N5O), Z = 4, Dc = 1.227 g/cm3 , F(000) = 600, ?= 0.082 mm-1, R = 0.0561 and wR = 0.1538. The total reflections were 8214 and the independent ones were 2624 (Rint = 0.0559), of which 1756 were observed with I > 2s(I). The torsion angles of the important groups (C(6)N(1) N(2)C(7) and C(7)N(3)N(4)C(8)) are 68.3(3) and 93.3(3), respectively. In the crystal lattice, the molecules form a network structure through hydrogen bonds. The crystal structure is stabilized by NH…N and NH…O hydrogen bonds. FT-IR spectra clearly show there exist acetonitrile molecules in the crystal lattice.展开更多
Ultraviolet （UV） spectrophotometry was used to test the chromium （Cr） content of bast fiber by using dipbenylearbazide （DPC） as color reagent. The results showed that complexes were formed from Cr （VI） ions an...Ultraviolet （UV） spectrophotometry was used to test the chromium （Cr） content of bast fiber by using dipbenylearbazide （DPC） as color reagent. The results showed that complexes were formed from Cr （VI） ions and DPC under phosphoric acid condition. There was a maximum positive absorption peak at 540 rim. Cr （VI） concentration （ in the range of 0. 004.1. 000 mg· L -1 ） and the absorbance of complex obeyed the Lambert-Beer law. The optimal technology was dropping volume of phosphoric acid 0.4- 0.6 mL, DPC content 2.0-4.0 mL, and coloration time 5-10 min. The total Cr content in bast fiber samples from a Cr mine area was tested, and the results showed that the total Cr contents decreased along the water flow of river.展开更多
Compounds containing Cr （VI） ion are widely used for chemical industry, paints, dyes, and other applications. Because of commonly known toxicity of Cr （VI） ion, Cr （VI） is one of the important check items for qu...Compounds containing Cr （VI） ion are widely used for chemical industry, paints, dyes, and other applications. Because of commonly known toxicity of Cr （VI） ion, Cr （VI） is one of the important check items for quality of water in natural river or industrial waste water. Although the only method for selective detection for Cr （VI） ion is diphenylcarbazide, of which pretreatment spends long time according to the regulat^ons by the Ministry of Environment, Japan. Herein we develop a new and simple pretreatment for the job site and suitable for education and attempt to apply for analysis of the soil in Tama River actually.展开更多
基金the Educational Administration Key Project of Shandong province (No. J01C05) and the Outstanding Adult-Young Scientific Research Encouraging Foundation of Shandong province (No. O1BS18)
文摘The title compound (PhNHNH)2C=OCH3CN has been prepared and characterized by elemental analysis and IR spectrum studies. The single-crystal X-ray structure determination of the title compound was carried out. It crystallizes in the monoclinic system, space group P21/n with a = 5.7818(2), b = 15.320(1), c = 17.469(1) ? b = 97.476(1)? V = 1534.2(1) 3, Mr = 283.34 (C15H17N5O), Z = 4, Dc = 1.227 g/cm3 , F(000) = 600, ?= 0.082 mm-1, R = 0.0561 and wR = 0.1538. The total reflections were 8214 and the independent ones were 2624 (Rint = 0.0559), of which 1756 were observed with I > 2s(I). The torsion angles of the important groups (C(6)N(1) N(2)C(7) and C(7)N(3)N(4)C(8)) are 68.3(3) and 93.3(3), respectively. In the crystal lattice, the molecules form a network structure through hydrogen bonds. The crystal structure is stabilized by NH…N and NH…O hydrogen bonds. FT-IR spectra clearly show there exist acetonitrile molecules in the crystal lattice.
基金University-Industry Cooperation Key Project of Hubei Provincial Department of Education,China (No. CXY2009B018)
文摘Ultraviolet （UV） spectrophotometry was used to test the chromium （Cr） content of bast fiber by using dipbenylearbazide （DPC） as color reagent. The results showed that complexes were formed from Cr （VI） ions and DPC under phosphoric acid condition. There was a maximum positive absorption peak at 540 rim. Cr （VI） concentration （ in the range of 0. 004.1. 000 mg· L -1 ） and the absorbance of complex obeyed the Lambert-Beer law. The optimal technology was dropping volume of phosphoric acid 0.4- 0.6 mL, DPC content 2.0-4.0 mL, and coloration time 5-10 min. The total Cr content in bast fiber samples from a Cr mine area was tested, and the results showed that the total Cr contents decreased along the water flow of river.
文摘Compounds containing Cr （VI） ion are widely used for chemical industry, paints, dyes, and other applications. Because of commonly known toxicity of Cr （VI） ion, Cr （VI） is one of the important check items for quality of water in natural river or industrial waste water. Although the only method for selective detection for Cr （VI） ion is diphenylcarbazide, of which pretreatment spends long time according to the regulat^ons by the Ministry of Environment, Japan. Herein we develop a new and simple pretreatment for the job site and suitable for education and attempt to apply for analysis of the soil in Tama River actually.
