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食品防腐剂应用研究 被引量:4
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作者 段春影 王金龙 郭玲玲 《江苏调味副食品》 2018年第3期31-33,共3页
食品防腐剂在我们日常生活中不可或缺,但是由于不法商贩的滥用,导致人们谈之色变。通过整理有关资料,结合所学知识及国家统计局对食品添加剂安全事故的统计进行深入研究,证明合理使用食品添加剂并不会对人体造成伤害,并且针对生活误区... 食品防腐剂在我们日常生活中不可或缺,但是由于不法商贩的滥用,导致人们谈之色变。通过整理有关资料,结合所学知识及国家统计局对食品添加剂安全事故的统计进行深入研究,证明合理使用食品添加剂并不会对人体造成伤害,并且针对生活误区给予纠正。 展开更多
关键词 食品添加剂 合理使用 生活误区
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Structure of Metal Aluminophosphates:Al_(9-x)M_xP_(12)O_(48)(TREN)_4·yNH_4·zH_2O [TREN=N(CH_2CH_2NH_3)H_m,M=Mn,Co]
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作者 XU Yao-hua LI Yong-xiu +5 位作者 FENG Shou-hua CHEN Xiao-feng JIN Hai-ying PANG Wen-qin duan chun-ying YOU Xiao-zeng 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2006年第1期1-5,共5页
Two large-pore metal-doped aluminophosphates, Mn4Al5(PO4 )12[N( C2H4NH3)3]3 [ N(C2H4NH3)2·(C2H4NH2)](NH4)2·14H=O(Mn4-NJU) and Co4Al5(PO4)12[N(C2H,NH3)3][N(C2H4NH3)2(C2H4NH2)]3· ( N... Two large-pore metal-doped aluminophosphates, Mn4Al5(PO4 )12[N( C2H4NH3)3]3 [ N(C2H4NH3)2·(C2H4NH2)](NH4)2·14H=O(Mn4-NJU) and Co4Al5(PO4)12[N(C2H,NH3)3][N(C2H4NH3)2(C2H4NH2)]3· ( NH4 )4· 13H2O ( Co4-NJU) , which have the same open framework structures, were hydrothermally synthesized. The structures of these compounds consist of TO4 tetrahedra, which are linked together by corner-sharing to form an open framework with unique intersecting twelve-membered ring channels in three dimensions. The compounds crystallize in cubic space group I(-4)3m with α= 1. 6795(2) nm and V=4. 7374(9) nm^3 for Mn4-NJU, and a=1. 67372(19) nm and V = 4. 6887 (9) nm^3 for Co4-NJU, respectively. Single crystal structure analyses show that the protruding O atoms of the frameworks of the compounds are linked to protonated 4-( 2-aminoethyl )diethylenetriamine (TREN, C6H18N4 ) ions in the windows by means of hydrogen-bonding under the hydrothermal condition. It is also found that the components inside the super cages of the compounds are changeable, and the metal ions M^2+ (M = Mn, Co) and Al^3+ disorderedly occupy the same crystallographic positions. 展开更多
关键词 PHOSPHATE TREN Transition metal ALUMINOPHOSPHATES HYDROTHERMAL Synthesis
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Crystal Structure of[Ru(taab)(DMF)_2]·[(CIO_4)_2]
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作者 duan chun-ying Lu Zhong-Lin +2 位作者 Tian Yu-Peng You Xiao-Zeng Chen Yao (Coordination Chemistry Institute and State Key Laboratory of Coordination Chemistry of Nanjing University, Nanjing, 210008) (Centre for Advance Studies in Sciences and Technology of Micr 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 1995年第2期127-130,共4页
Crystal structure of the title compound, macrocyclic tetrabenzo(b ,f,J, n ) [ 1, 5, 9, 1 3] tetraazacyclohexadecine (TAAB ) N, N'-dimethyl formamide(DMF) ruthenium (Ⅱ) complex, [Ru (taab) (DMF )_2]·[ (ClO_4 ... Crystal structure of the title compound, macrocyclic tetrabenzo(b ,f,J, n ) [ 1, 5, 9, 1 3] tetraazacyclohexadecine (TAAB ) N, N'-dimethyl formamide(DMF) ruthenium (Ⅱ) complex, [Ru (taab) (DMF )_2]·[ (ClO_4 )_2](C_(34) H_(34)Cl)2N_6O_(10)Ru , M_r= 874. 66) is monoclinic with space group C2/c and a =36. 689(2) , b=18. 173 (8 ),. c= 10. 666(3)A, β=102. 6(4)°, V=6939. 6 A ̄3 , D_c= 1. 67 gcm ̄(-3), Z=8. The structural solutions and refinements based on 3183 reflections (I≥3σ(I)) converged at R= 0. 071 , R_w = 0. 074. The TAAB macrocyclic ligand has a saddle-shaped appearance,the ruthenium(Ⅱ) is located on the plane of the four nitrogen atoms of the TAAB with the two perpendicular Ru(Ⅱ)-O bonds coordinated to the DMF molecules. 展开更多
关键词 crystal structure macrocyclic ruthenium complex photoconductive saddle-shaped appearance
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Synthesis and Structure of 4-Nitrobenzaldehyde Thiosemicarbazone 被引量:1
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作者 Tian Yu-Peng duan chun-ying +1 位作者 Lu Zhong-Lin You Xiao-Zeng(Coordination Chemistry Institute, State Key Laboratory of Coordinatton Chemistry,Nanjing Univuersity, Centre for Advanced Studies in Science and Technology of Microstructure, Hanjing, 210093) Luo B 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 1996年第4期307-310,共4页
Nitrobenzaldehyde thiosemicarbazone (C_8H_8N_4O_2S) has been prepared by the condensation of 4-nitrobenzaldehyde with thiosemicarbazide. This compound crystallized in monoclinic space group P2_1/c with the unit cell p... Nitrobenzaldehyde thiosemicarbazone (C_8H_8N_4O_2S) has been prepared by the condensation of 4-nitrobenzaldehyde with thiosemicarbazide. This compound crystallized in monoclinic space group P2_1/c with the unit cell parameters : a =4. 560(2), b=24. 900(4), c=8. 950(2) A, β=98. 37(2)°, V=1005. 2 A ̄3, Z=4,D_c = 1. 482 g/cm ̄3, λ= 0. 71073 A, μ(MoKα)=0. 293 mm ̄(-1) , final R= 0.044 for 1568 observed reflections. Analvsis of molecular structure reveals that the molecule is in trans-configuration. The molecular packing is governed by N-H...S and O... H-N hydrogen bonding interactions. 展开更多
关键词 molecular structure THIOSEMICARBAZONE 4-nitrobenzaldehyde thiosemicarhazone
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Synthesis and Crystal Structure of Mercury BridgedBiferrocene Trinuclear Complex Hg(FcL)_2,Bis(S-methyl-N-(1-ferrocenyl-1-methyl)methylenedithiocarbazate)mercury(Ⅱ) 被引量:1
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作者 duan chun-ying LIU Ze-Hua +1 位作者 TIAN Yu-Peng YOU Xiao-Zeng(Coordination Chemistry Institute, State Key Laboratory of Coordination Chemistry,Nanjing Univrsity, Nanjing, 210093) 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 1998年第1期1-4,共4页
The title complex, mercury bridged biferrocene trinuclear complex Hg(FcL)2. Bis (S-methyl-N- (1-ferrocenyl-1-methyl) methylenedithiocarbazate) mercury,Crystallizes in space group Pbca with a =19. 510 (4), b=19. 921 (5... The title complex, mercury bridged biferrocene trinuclear complex Hg(FcL)2. Bis (S-methyl-N- (1-ferrocenyl-1-methyl) methylenedithiocarbazate) mercury,Crystallizes in space group Pbca with a =19. 510 (4), b=19. 921 (5), c=15. 581 (3)A. V=6095(3) A, Z=8,M.=863. 12, Dc=1.881 g/cm3; u=19. 24 cm-1 and F(000) = 3376. The final refinement of 2455 observed reflections is converged with R= 0. 043 and Rw=0.047. X-ray crystal structure analysis revealed that the coordinationgeometry of Hg atom is a distorted tetrahedron with two Hg-N bonds and two Hg- S bonds. The Schiff-base ligand loses a proton from its tautomeric thiol form and is cryordianted to the Hg aotm uia the mercapto sulphur and the β-nitrogen atoms. 展开更多
关键词 mercury(Ⅱ) bridged biferrocene trinuclear complex crystal structure
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