共查询到20条相似文献,搜索用时 375 毫秒
1.
Dong-heng Zhang Su-yun Jie Hai-jian Yang Fei Chang Wen-hua Sun Key Laboratory of Engineering Plastics Institute of Chemistry Chinese Academy of Sciences Beijing China 《高分子科学》2005,23(6)
A series of salicylaldimines,synthesized in high yield via microwave-assisted condensation of salicylaldehyde and 2-alkoxyaniline were allowed to react with nickel chloride to form six-coordinated nickel complexes.These nickel complexes were carefully characterized,and the solid structure of la was elucidated by X-Ray diffraction.Activated with MAO,the nickel complexes showed good activity for homopolymerization of norbornene.Reaction parameters,such as the ratio of nickel precursor to MAO,monomer concentration,reaction time and the reaction temperature,as well as the nature of the ligands were found to have significant effects on the catalytic activity and some properties of the resulting polynorbornene. 相似文献
2.
合成了6种含有氮芥结构及膦酰甲基取代基的磷酰二胺。其结构经~1H NMR、MS和元素分析确定,讨论了它们的性质,并对部分化合物的抗癌活性进行了初步试验。 相似文献
3.
Chen Y. -M. Chen D. -M. Wu Q. -M. Ye W. -J. Zhao C. -S. Liao W. -K. Zhou Z. -X. 《Journal of Structural Chemistry》2021,62(10):1501-1510
Journal of Structural Chemistry - (2S,2′S,6R,6′R)-4,4′-(6-Bromopyrido[2,3-d]pyrimidine-2,4-diyl)bis(2,6-dimethylmorpholine) is a novel organic intermediate having... 相似文献
4.
《结构化学》1988,(2)
<正> C32H68Cl4S2Pt, Pt[(BEHS)2Cl4], Mr=853.9, space group P21/a, a =10.445(3), b=15.012(4), c = 13.506(5) A,β=101.43(3)°,V=2076(1) A3, Z=2, DC=1.37 g·cm-3, MoKa radiation, u= 39.3 cm-1, F(OOO) = 876 e, R = 0.053 for 1790 reflections. Pt(IV) is coordinated by four chloro atoms and two S atoms of BEHS, forming a somewhat distorted octahedron with Pt-S of 2.366 and Pt-Cl of 2.309A. The packing pattern of the long BEHS chain may allow the existence of conformational disorder. 相似文献
5.
《Journal of Coordination Chemistry》2012,65(1-4):349-359
Abstract A novel peroxopolyoxomolybdate compound, [N(CH3)4]3 [H(SO4)2 (MoO2(O2))3] · 3H2O, has been obtained from a strongly acidic aqueous solution of a molybdate-sulfate system as the monoclinic crystal of P2/n, a = 13.497(3), b = 15.231(4), c = 32.603(2) Å, β = 103.113(9)°, and V = 6577(2) Å3. The final R-value was 0.0986 for 395 parameters using 7162 reflections. Each of the two crystallographically independent polyanions contains three molybdenum atoms with five O2?, one O2 2?, and two sulfate groups, one of which is a tripod ligand apical to the molybdenum plane, and the other is a bipod ligand equatorial to the Mo plane. 相似文献
6.
《结构化学》1992,(5)
<正> The title complex is of triclinic system space group P1 with its cell parameters: a = 9. 386(1), b = 9. 412(2), c=11. 549(2)(?), α=97. 91(2), β = 81.70(1), γ= 102. 63(1)°, V= 979.2(?)3, Z = l, Mr = 966. 01, Dx =1. 638 gcm-3, μ(MoKα) = 16. 896cm-1, F (000) = 478, final R = 0. 033 and Rw = 0. 046 for 3424 reflections with I≥3σ(I). The two O atoms of the ligand are bonded to two Sn atoms to form a bridged binuclear species which lies on the crystallographic centre of symmetry situated at the centre of the ethylene C -C bond. The unique Sn atom exhibits a trigonalbipyramidal geometry. 相似文献
7.
Etify A. Bakhite Abdu E. Abdel-Rahman Elham A. Al-Taifi 《Phosphorus, sulfur, and silicon and the related elements》2013,188(3):513-520
5-Acetyl-3-amino-4-aryl-6-methylthieno[2,3-b]pyridine-2-carboxamides (1a, b) were reacted with aromatic aldehydes or with some cycloalkanones to give the corresponding tetrahydropyridothienopyrimidinone derivatives 2a–f and 4a–d . The reaction of compound 1b with urea and/or carbon disulfide has been carried out and their products were identified. Some representative compounds were screened in vitro for their antimicrobial activities. 相似文献
8.
The C30H30N4O10S2U complex (I) has been investigated and characterized by single crystal X-ray diffraction (CIF file CCDC no. 970349), IR and UV-Vis spectroscopic techniques. X-ray results show that the title compound crystallizes in the monoclinic system, space group P21/c with a = 14.8219(14), b = 11.6177(11), c = 20.0854(15) Å, β = 104.268(9)°, V = 3351.9(5) Å3 and Z = 4. In the title structure, the U atom has a distorted pentagonal-bipyramidal geometry with a tetradentate Schiff base ligand in the equatorial plane and oxo atoms in the axial positions. The C-S-N(H)-N linkage is non-planar, the torsion angle being ?98.7(15)° and the S atom showing a tetrahedral environment. The crystal packing occurs intra-inter molecular N-H?O and C-H?O hydrogen bonds. 相似文献
9.
《Journal of Coordination Chemistry》2012,65(1-2):133-144
Abstract Reactions of Mo(CO)6 with Na2WO4 · 2H2O in refluxing carboxylic anhydride produce the triangular bioxo-capped mixed-metal carboxylate clusters Na[MoW2O2(O2CR)9] (R = Me, 1; Et, 2), the propionate being hydrolyzed in 2M HCl containing ZnCl2 to form [MoW2O2(O2CEt)6(H2O)3]ZnCl4·2H2O (3). Cluster 2 is converted to the incomplete cuboidal tetraanion [MoW2O4(O2CEt)8]4- upon reacting with Cr(CO)6 in propionic anhydride at 120°, the latter species being trapped by Cr3± and Na± ions in the reaction mixture to afford the octanuclear heterometallic chain-like cluster Na2Cr2 [MoW2O4(O2CEt)8]2 (4). Clusters 1, 3 and 4 have been characterized by X-ray crystallography with the following crystal data, for 1: monoclinic, space group P21/c, a = 16.666(8), b = 11.096(3), c = 16.541(7) Å, β = 94.60(4)°, V = 3048.9 Å3, Z = 4, R, Rw = 0.070, 0.079; for 3, monoclinic, space group Cm, a = 10.259(3), b = 15.756(3), c = 10.870(3) Å, β = 96.18(3)°, V = 1746.8 Å3, Z = 2, R, Rw = 0.028, 0.034; for 4, triclinic, space group P-1, a = 13.013(5), b = 14.005(4), c = 12.357(4) Å, α = 109.71(2), β = 117.77(3), γ = 90.41(3)°, V = 1838.9 Å3, Z = 1, R, Rw = 0.037, 0.042. 相似文献
10.
I. I. Chuev O. S. Filipenko S. M. Aldoshin O. A. Kozina 《Russian Chemical Bulletin》1994,43(11):1857-1859
Photochromic 1, 3, 3 -trimethyl-6-trifluoromethylsulfonyl-spiro(indoline-2,2-ben-zo[b]pyran) (1) was studied by X-ray diffraction analysis. In compound1, the Cspiro-O bond (1.49(1) Å (average)), broken on photoexcitation, is the longest of all the indoline spiropyrans studied.Translated fromIzyestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 1969–1971, November, 1994. 相似文献
11.
Julian Mirek Janusz Moskal Krzysztof Nagraba 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1-2)
Abstract Some authors have shown that tetrahydropyrimidine-2-thiones are hydrated in acidic solution and then isomerise to the 2-imino-or 2-enamino-1,3-thiazine. 相似文献
12.
Renzo Cini 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(10):1171-1173
The title compound, [Co(C23H29N3O4)]·0.5C2H6O or [CoII{(4-MeO-sal)2Medpt}]·0.5CH3CH2OH [(4-MeO-sal)2Medpt is N,N′-(4-methyl-4-azaheptane-1,7-diyl)bis(4-methoxysalicylideniminate)], obtained through the reaction of H2[(4-MeO-sal)2Medpt] and Co(CH3COO)2 in refluxing ethanol under an atmosphere of ultrapure nitrogen, has the usual pseudo-trigonal-bipyramidal coordination arrangement previously found for this class of (sal)2Rdpt compounds. The O—Co—O bond angle [120.4 (1)°] is significantly smaller than the corresponding values previously found for most non-O2-bound [CoII{(sal)2Medpt}]-type molecules (observed range 126.9–138.6°), whereas the equatorial Co—N bond [2.185 (3) Å] is relatively long. 相似文献
13.
14.
《Journal of Coordination Chemistry》2012,65(1-2):19-27
Abstract The reactions between As(III), tartaric acid (H2T)and DCTA were investigated polarographically. The conditional stability constants of As(III)-complexes at a given pH-value and variable ligand concentration were calculated from the change of the limiting currents. The optimum conditions for calculating stability constants from the current were also discussed. It was found that DCTA (H4L)formed the complex [As(OH)2HL]2- whose overall formation constant was lgβ111=(20.67 ±0.09)atμ=0.1 and t°- (25.0±0.2)°C, whereas the complex between As(III) and H2T was [As(OH)2T]? with an overall stability constant 1gβ 101= 6.62 ±0.14 at μ=0.1 and t°= (25 ± 0.2)°C. 相似文献
15.
Abdou O. Abdelhamid Fawzy A. Attaby Mayssoune Y. Zaki 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1-4):403-410
Abstract Several new thiadiazoline, selenodiazoline, thiadiazolo[2, 3-b]quinazoline and arylazothiazole derivatives were synthesized via the reaction of 2- (thiocyanatoacetyl)-2′-benzofuran with arendiazonium chlorides, nitrous acid, acetic anhydride, benzoyl chloride, diazotised anthranilic acid and its methyl ester and thiourea. The structures of the newly synthesized derivatives were established on the basis of elemental analyses and spectral data studies. 相似文献
16.
The keto and gem-ester functionalities of cyclohexanonedicarboxylates (1) offer a facile route for the synthesis of 5,7-diarylspiro[4,5,6,7-tetrahydrobenzo[d][1,2,3]selena/thiadiazole-6,5′-(hexahydropyrimidine)]-2′,4′,6′-triones (6 and 8) and -2′-thioxo-4′,6′-diones (7 and 9). The new compounds were characterized by IR, NMR, and CMR spectral data. © 1999 John Wiley & Sons, Inc. Heteroatom Chem 10: 17–23, 1999 相似文献
17.
Ahmed A. Abdel-Khalek Mohamed M. Khalil Eman S. H. Khaled 《Transition Metal Chemistry》1993,18(2):153-157
The kinetics of the oxidation of [N-(2-hydroxyethyl)-ethylene-diamine-N,N,N-triacetato] cobalt(II), [CoII-(HEDTA)]–, by N-bromosuccinimide, NBS, have been studied in aqueous solutions and water-methanol solvent mixtures under various conditions. The reaction stoichiometry indicates that one mole of NBS reacts with one mole of [CoII(HEDTA)]–. In aqueous solutions the reaction obeys the following rate law:
相似文献
18.
A series of salicylaldimines, synthesized in high yield via microwave-assisted condensation of salicylaldehyde and 2-alkoxyaniline were allowed to react with nickel chloride to form six-coordinated nickel complexes. These nickel complexes were carefully characterized, and the solid structure of la was elucidated by X-Ray diffraction. Activated with MAO, the nickel complexes showed good activity for homopolymerization of norbornene. Reaction parameters, such as the ratio of nickel precursor to MAO, monomer concentration, reaction time and the reaction temperature, as well as the nature of the ligands were found to have significant effects on the catalytic activity and some properties of the resulting polynorbornene. 相似文献
19.
《结构化学》1989,(2)
<正> [Me4N]6[Ag6(i-mnt)6].H2O(1),[Et4N]4[Cu8(i-mnt)6](2) and [Me4N]4-[Cu5Ag3(i-mnt)6].H2O(3)(i-mnt=S2C=C(CN)2) were synthesized. The crystal and molecular structure of the complex 1 was reported by us.The structure of the complex 2 was determined from single crystal X-ray diffraction data. [Et4N]4[Cu8(i-mnt)s] 2, Mr=1870.46, monoclinic, P21/n, a=14.724(6), b = 17.228(3), c=15.59(1)A,β= 100.75(7)°,V=3886.3A3;Z = 2,Dc= 1.598 g/cm3. Complex 3 has been characterized by ICP elemental analyses and IR spectrum. 相似文献
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