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1.
Y. H. Xing Z. Sun W. Zou J. Song K. Aoki M. F. Ge 《Journal of Structural Chemistry》2006,47(5):913-922
The reaction of VO(acac)2 (acac = acetylacetonate) with NaHB(pz)3 (pz = pyrazole) or NaHB(3,5-Me2pz)3 in methanol gave vanadium(IV) complexes HB(pz)3VO(acac) (1) or HB(3,5-Me2pz)3VO(acac)·CH3CN (2), respectively. The complexes 1 and 2 were characterized by elemental analysis, IR, UV-vis, NMR and X-ray diffraction crystallography methods. Complex 1 crystallizes in space group P21/c, a = 7.641(2) Å, b = 17.008(4) Å, c = 13.362(2) Å; β = 92.092(17)°, V = 1735.5(7) Å3, Z = 4. Complex 2 crystallizes in space group P21/c, a = 17.410(13) Å, b = 8.076(16) Å, c = 19.300(13) Å; β = 101.75(5)°, V = 2657(6) Å3, Z = 4. X-ray structure analyses have shown that the complexes 1 and 2 are monomeric with a similar coordination environment of the vanadium atom. Luminescence properties and cytotoxic effects
of the complexes are discussed. On CBRH-7919 cells, the complexes 1 and 2 caused a slight stimulation of growth at low doses (1–10 μM) and a significant cytotoxic effect at higher doses (100–1000
μM). The electronic structure and the bonding characters of the two complexes were analyzed with ab initio calculations.
Original Russian Text Copyright ? 2006 by Y. H. Xing, Z. Sun, W. Zou, J. Song, K. Aoki, and M. F. Ge
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Translated from Zhurnal Strukturnoi Khimii, Vol. 47, No. 5, pp. 924–932, September–October, 2006. 相似文献
2.
Mahmure Ü. Özgür Güzin Alpdoğan Bürge Aşçi 《Monatshefte für Chemie / Chemical Monthly》2002,133(2):219-223
Summary. A simple and rapid derivative spectrophotometric assay procedure is described for the analysis of caffeine (1), acetaminophen (2), and propyphenazone (3) in tablet formulations. The concentration range of application is 5.0–25.0 μg·cm−3 for 2 and 3 and 1.0–5.0 μg·cm−3 for 1. The method involves the extraction of the drugs from tablets with 0.1 N H2SO4, filtration, appropriate dilution, and measurement of the fourth derivative absorbance values at zero crossing wavelengths
of 230.0, 263.2, and 256.6 nm for 1, 2, and 3. As a reference method, a reversed phase HPLC procedure was developed. Commercially available tablets were analyzed; statistical
comparison of the results with those obtained from the reference method showed good agreement. The derivative spectrophotometric
method has the advantage of being simple, rapid, inexpensive, and easy to perform.
Received April 18, 2001. Accepted (revised) June 5, 2001 相似文献
3.
T. E. Kokina L. A. Glinskaya E. A. Sankova R. F. Klevtsova S. V. Larionov 《Journal of Structural Chemistry》2005,46(6):1031-1038
The interaction of the Co(iso-Bu2PS2)2 chelate with 4-NH2Py afforded a paramagnetic complex [Co(4-NH2Py)(iso-Bu2PS2)2] (μeff = 4.53 BM). Single crystals of [Ni(4-NH2Py)2(iso-Bu2PS2)2] (I) and [Co(4-NH2Py)(iso-Bu2PS2)2] (II) were grown and used for X-ray diffraction investigation (X8 APEX diffractometer, MoK
α radiation). Crystals I are monoclinic with unit cell parameters a = 12.5336(5) Å, b = 9.4356(4) Å, c = 16.4095(6) Å; β = 111.351(1)°; V = 1807.4(1) Å3; Z = 2, ρ = 1.223 g/cm3, space group P21/n. Crystals II are triclinic with unit cell parameters a = 8.7572(4) Å, b = 9.6934(6) Å, c = 18.665(1) Å; α = 79.374(2)°, β = 87.049(2)°, γ = 75.640(2)°; V = 1508.6(1) Å3; Z = 2, ρ = 1.259 g/cm3; space group
. The structures of I and II are formed by isolated mononuclear molecules. The coordination unit is NiN2S4 (octahedron) in I and CoNS4 (tetragonal pyramid) in II. The 4-NH2Py molecule is coordinated through the N atom of the heterocycle. Electronic spectroscopy data for II agree with the symmetry of the NS4 polyhedron found by X-ray diffraction (XRD) analysis. The noncoordinated amine groups link the complex molecules via N-H...S
hydrogen bonds.
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Translated from Zhurnal Strukturnoi Khimii, Vol. 46, No. 6, pp.1072–1080, November–December, 2005.
Original Russian Text Copyright ? 2005 by T. E. Kokina, L. A. Glinskaya, E. A. Sankova, R. F. Klevtsova, and S. V. Larionov 相似文献
4.
Klaus-Michael Ochsenkühn Theopisti Lyberopoulou G. Koumarianou Maria Ochsenkühn-Petropoulou 《Mikrochimica acta》2008,160(4):485-492
In the time period from June 2005 to May 2006 in 42 sampling campaigns 84 filter samples of airborne particulate matter, coarse
(PM10–2.5) and fine (PM2.5), were collected using a Gent stacked filter unit in the coastal industrial area of Aspropyrgos in Attica, Greece. The average
PM10 (PM10–2.5 + PM2.5) concentration was found to be 66 μg · m−3, exceeding more than 1.6 times the annual limit of 40 μg · m−3. The samples were analysed for Cl−, NO3
−, SO4
2−, Ca2+, Mg2+, Na+, K+ and NH4
+ using ion chromatography. The data were compared with results obtained with other spectrometric methods, such as inductively
coupled plasma-atomic emission spectrometry, atomic absorption spectrometry, energy dispersive X-ray fluorescence and reflectometry.
The determined average ionic content comprised about 44% of the PM10 mass. The ionic composition, as well as the possible matrix compounds in both fractions were evaluated by dividing the sampling
period into summer and winter season. In the PM10–2.5/PM2.5 fraction in summer time the concentrations of Ca2+, Mg2+ and NO3
− were enriched in the coarse fraction. In winter time all species were enriched in the coarse fraction, especially Ca2+, Cl− and NO3
−. NH4
+ was constantly higher in the fine fraction in summer as well as in winter time. Factor analysis was applied to obtain correlations
between cations and anions leading to matrix compounds in both fractions. From the evaluation of the results obtained, some
of the local air pollution sources could be identified.
Correspondence: Klaus-Michael Ochsenkühn, Laboratory for Trace Element Studies, Institute of Physical Chemistry, NCSR “Demokritos”,
Aghia Paraskevi 15310, Athens, Greece 相似文献
5.
N. A. Sanina T. N. Rudneva S. M. Aldoshin A. N. Chekhlov R. B. Morgunov E. V. Kurganova N. S. Ovanesyan 《Russian Chemical Bulletin》2007,56(1):28-34
The neutral dinuclear iron nitrosyl complex [Fe2(SC3H5N2)2(NO)4] (1) of the “g = 2.03” family with a ligand analogous to natural mercaptohistidine was synthesized by the metathesis reaction
of the thiosulfate ligands in the [Fe2(S2O3)2(NO)4]2− anion with imidazolidine-2-thiolate ligands. The electrochemical determination of nitrogen oxide in solution showed that
compound 1 has a lower NO-donor ability compared to the iron complexes with 1-methylimidazole-2-thiol and imidazole-2-thiol synthesized
earlier. Study of the magnetic properties of polycrystals of 1 demonstrated that the effective magnetic moment at room temperature is ca. 2.45 μB and corresponds to a molecule containing a pair of the noninteracting spins S = 1/2. This is evidence that each iron coordination
unit in complex 1 contains one unpaired electron, and the iron atom is in the low-spin state.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 28–34, January, 2007. 相似文献
6.
A biased bimetallic Fe-Fe complex Cp*Fe(dppe)(C≡CFc) (1) was synthesized from FcC≡CH (Fc=C5H4FeC5H5) and Cp*Fe(dppe)Cl (Cp*=C5Me5). Its one-electron oxidation species [Cp*Fe(dppe)(C≡CFc)][PF6] (1a) was also prepared and the spectroscopic properties of 1a was studied. The single-crystal X-ray diffraction analysis of 1 shows that ferrocenylacetylene is bonded at the terminal carbon to the iron center in the Cp*Fe(dppe) part. Crystallographic data for 1: monoclinic, space group C2/c, with a=4.067 65(14) nm, b=1.260 74(4) nm, c=1.649 89(5) nm, β=104.387(10)°, V=8.195 7(5) nm3, Z=8, Dc=1.354 g·cm-3, F(000)=3512, μ=0.822 mm-1. The structure was refined to R1=0.038 4, wR2=0.100 0. CCDC: 234893. 相似文献
7.
R. F. Klevtsova T. G. Leonova L. A. Glinskaya S. V. Larionov 《Journal of Structural Chemistry》2006,47(6):1182-1187
A mixed-ligand complex ZnPhen(n-BuOCS2)2 has been synthesized. The structure of the compound was solved by X-ray diffractometry (X8 APEX diffractometer, MoK
α radiation, 4254 F
hkl
, R = 0.0448). Triclinic crystals with the parameters a = 9.4464(3) Å, b = 11.0279(4) Å, c = 13.6528(6) Å;α = 106.940(1)°, β = 98.382(1)°, γ = 106.347(1)°; V = 1264.72(8) Å3; Z = 2, space group 1. P1ˉ. The structure consists of discrete mononuclear molecules. The polyhedron of the Zn atom is a trigonal bipyramid N2S3 formed by coordination of the N atoms of the bidentate Phen molecules and the sulfur atoms of the monodentate and cyclic
bidentate xanthate ligands. Dimer assemblies are formed in the structure due to π-π interactions of Phen molecules.
Original Russian Text Copyright ? 2006 by R. F. Klevtsova, T. G. Leonova, L. A. Glinskaya, and S. V. Larionov
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Translated from Zhurnal Strukturnoi Khimii, Vol. 47, No. 6, pp. 1189–1194, November–December, 2006. 相似文献
8.
M. N. Sokolov E. V. Chubarova E. V. Peresypkina A. V. Virovets V. P. Fedin 《Russian Chemical Bulletin》2007,56(2):220-224
The reactions of the tetranuclear hydroxo complexes [M4(μ2-OH)8(H2O)16]8+ (M = Zr or Hf) with the lacunary Keggin-type ([α-PW11O39]7−) and Dawson-type ([α 2-P2W17O61]10−) phosphotungstates in aqueous solutions produce the sandwich polyoxometalate complexes [M(α-PW11O39)2]10− (M = Zr (1) or Hf (2)) and [M(α 2-P2W17O61)2]16− (M = Zr (3) and Hf (4)). The complexes were isolated and structurally characterized as salts with potassium and dimethylammonium cations. The zirconium
and hafnium atoms have a square antiprismatic coordination environment (coordination number is 8). In all complexes, the mutual
arrangement of the ligands corresponds to the syn isomer. Hafnium complexes 2 and 4 are the first structurally characterized polyoxometalate complexes of this metal. The structures of the resulting compounds
were confirmed also by 31P NMR spectroscopy in solution.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 214–218, February, 2007. 相似文献
9.
The products of the reactions of polymethylalumoxane (MAO) with triisobutylaluminum (TIBA), rac-Me2Si(2-Me,4-PhInd)2ZrCl2 (1) with MAO (1 + MAO), and (1 + MAO) + TIBA were studied by 1H NMR at different molar ratios of the components. When the ratio AlTIBA/AlMAO is ∼6, the reaction between MAO and TIBA involves the replacement of the methyl group of MAO by isobutyl groups and the formation
of isobutylmethylalumoxane or mixed isobutylmethylalumoxane structures. When the TIBA content in the system increases to 30
mol.%, these structures are rearranged to form products with a low degree of association. With the equimolar ratio of the
reactants, the main reaction products are tetraisobutylalumoxane and polyisobutylalumoxane. The 1 + MAO system with the molar ratio AlMAO/Zr = 50 affords a MAO-bonded monomethyl monochloride derivative [L2ZrCl-μ-Me]δ+[MAO]δ−. An increase in this ratio to 150 produces intermediate binuclear complexes [L2ZrCl-μ-Me-MeZrL2]+[MAO]− and [Me2Al-(μ-Me)2-ZrL2]+[MAO]−. The addition of TIBA induces the replacement of the ZrMe groups by isobutyl groups at the first step of the interaction
and formation of nonidentified reaction products at the subsequent steps.
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 934–940, April, 2005. 相似文献
10.
A. V. Virovets S. N. Konchenko N. V. Podberezskaya 《Journal of Structural Chemistry》1999,40(1):51-57
The crystal structure of (Et4N)[(μ-H)Fe3(μ3-Se)(CO)9] is determined;the crystals are monoclinic, a = 11.172(2), b =32.332(5), c =13.552(3) ?, μ =91.86(2)‡, V
cell =4893(2) ?
3, space group P21/n, Z =8, d
calc =1.710 g/cm
3, CAD-4 diffractometer, MoKα radiation;the total number of data collected 4395,including 4086 independent reflections(Rint =0.0701), R(F) =0.0566, wR(F
2) =0.1202 for 1963 F
hkl > 4Σ(F). The data were corrected for the 37.8% linear drop of intensities of the control reflections due to crystal decay.
The Fe-H bond lengths are 1.5(1)-1.72(9) ?. As in the case of three-osmium clusters,the presence of the Μ-H ligand leads to a lengthening of the Fe-Fe bond by approximately 0.1 ? and to push-away of the equatorial
carbonyl ligands leading to an increase in the FeFeC angle by approximately 5–10‡, whereas the axial CO and (Μ
3-Se) remain unchanged. 相似文献
11.
Kaddouri A. Gronchi P. Centola P. Del Rosso R. 《Journal of Thermal Analysis and Calorimetry》2000,62(3):609-619
Ni–La/SiO2 catalysts were prepared by using a new metal organic precursor M(OC3H7)n, dissolved in organic solvent, hydrolysed and finally condensed to form inorganic polymers containing M–O–M or M–(μOH)–M
linkages. An optimal distribution of both the active phase ‘Ni’ and the promoter ‘La2O3’ was ensured by addition of their corresponding salts, previously dissolved in propionic acid, to a silica solution prior
to gelation. After drying under vacuum the precursor was submitted to thermal treatment in air at 600°C with a heating rate
of 1°C min–1.
The precursors and the corresponding catalysts were characterised by various techniques (TG-DTA, XRD, FTIR, TEM, BET and porosimetry)
and tested for methane dry reforming.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
12.
N. A. Shtel’tser S. V. Osintseva P. V. Petrovskii A. Z. Kreindlin F. M. Dolgushin 《Russian Chemical Bulletin》2006,55(12):2143-2148
The reaction of Ru3(CO)12 with 2-methyl-3-morpholino-1-phenylprop-2-en-1-one (1) produced the Ru6(CO)16(μ4-η1:η1:η2:η2-PhC(O)-C(Me)=C)2 (2), Ru2O2(CO)4(η3-OC(Ph)C(Me)C(H)C(Me)2C(Ph))2 (3), and [Ru(CO)2(PhCO2)(O(CH2-CH2)2NH]2 (4) complexes, which were characterized by IR and NMR spectroscopy. The structures of the complexes were established by X-ray
diffraction. The formation of the complexes is accompanied by deamination of ligand 1. Complexes 2 and 3 bearing the vinyl ketone groups contain five-membered oxaruthenacycles and dihydropyran rings. Morpholine is not removed
from the reaction mixture and leads to the formation of complex 4.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2063–2068, December, 2006. 相似文献
13.
J. Wang Y. Wang Zh. H. Zhang X. D. Zhang J. Tong X. Zh. Liu X. Y. Liu Y. Zhang Zh. J. Pan 《Journal of Structural Chemistry》2005,46(5):895-905
Syntheses and structure determination of the YIII complexes with ethylenediaminetetraacetic acid (H4edta) and trans-1,2-cyclohexanediaminetetraacetic acid (H4cydta) are reported. The crystal and molecular structures of the complexes, as well as their molecular formulas and compositions,
were determined by single-crystal X-ray structure analyses, NMR, IR, thermogravimetric measurements, and elementary analyses.
The crystal of the Na[YIII(edta)(H2O)3]·5H2O complex belongs to the orthorhombic crystal system and space group Fdd2. The crystal data are as follows: a = 19.355(5) Å, b = 35.431(11) Å, c = 12.122(3) Å, V = 8313(4) Å3, Z = 16, M = 544.23, Dc = 1.739 g·cm−3, μ = 2.908 mm−1 and F(000) = 4480. The final R and Rw are 0.0483 and 0.1172 for 3284 (I > 2σ(I)) unique reflections, R and Rw are 0.0678 and 0.1440 for all 8499 reflections, respectively. The YIIIN2O7 part in the [YIII(edta)(H2O)3]− complex anion has a pseudo-monocapped square antiprismatic nine-coordinate structure, in which the six coordinated atoms
(two N and four O) from the edta ligand and three water molecules are coordinated to the central YIII ion directly. The crystal of the Na[YIII(cydta)(H2O)2]·5H2O complex belongs to the triclinic crystal system and
space group. The crystal data are as follows: a = 8.405(2) Å, b = 9.970(2) Å, c = 14.763(4) Å, α = 88.538(4)°, β = 76.193(4)°, γ = 88.100(4)°, V = 1200.6(5) Å 3, Z = 2, M = 580.31, Dc = 1.605 g·cm−3, μ = 2.519 mm−1 and F(000) = 600. The final R and Rw are 0.0381 and 0.0911 for 4198 (I > 2σ(I)) unique reflections, R and Rw are 0.0530 and 0.1041 for all 6186 reflections, respectively. The YIIIN2O6 part in the [YIII(cydta)(H2O)2]− complex anion has a pseudo square antiprismatic eight-coordinate structure in which the six coordinated atoms (two N and
four O) from the cydta ligand and two water molecules are coordinated to the central YIII ion directly.
Original Russian Text Copyright ? 2005 by J. Wang, Y. Wang, Zh. H. Zhang, X. D. Zhang, J. Tong, X. Zh. Liu, X. Y. Liu, Y.
Zhang, and Zh. J. Pan
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Translated from Zhurnal Strukturnoi Khimii, Vol. 46, No. 5, pp. 928–938, September–October, 2005. 相似文献
14.
A simple and sensitive spectrophotometric method is developed for the determination of zinc in aqueous solutions. The metal
ion forms a greenish-yellow colored complex with 2,4-dihydroxybenzaldehyde isonicotinoyl hydrazone (2,4-DHBINH) in the pH
range of 4–10. The complex shows maximum absorbance at 390 nm and in the pH range of 6–8. Beer's law is obeyed in the range
0.10–1.50 μg/mL of Zn(II). The molar absorptivity and Sandell's sensitivity are 3.55 × 104 mol−1 cm−1 and 0.0016 μg/cm2, respectively. The composition of the complex is 1 : 1. The effect of interfering ions has been studied, and the method was
applied to the determination of zinc(II) in potable water and pharmaceutical samples. A fast derivative spectrophotometry
method is also proposed for the determination of zinc in the range 0.06–1.60 μg/mL, which is more sensitive than the zero
order method.
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Translated from Zhurnal Analiticheskoi Khimii, Vol. 60, No. 9, 2005, pp. 933–937.
Original Russian Text Copyright ? 2005 by Sivaramaiah, Raveendra Reddy.
The text was submitted by the authors in English. 相似文献
15.
The profile distribution of arsenic(III) and arsenic(V) species in soil and groundwater was investigated in the samples collected
in 2005 from a hand-drilled well, in the Bozanta area, Baia Mare region, Romania. The total content of arsenic in the soil
was in the range of 525–672 mg kg−1 exceeding 21–27 times the action trigger level for sensitive soil. 0.9–11.3 % of the total content was soluble in water,
83.0–92.6 % in 10 mol dm−3 HCl and 2.6–13.3 % was the residual fraction. Arsenic(V) was the dominant arsenic species in the soil in the range of 405–580
mg kg−1. The distribution and mobility of arsenic species was governed by soil pH and contents of Al, Fe, and Mn. The mobility of
arsenic(V) decreased with depth, while that of arsenic(III) was high at the surface and in the proximity of groundwater. The
total concentration of arsenic in groundwater was (43.40 ± 1.70) μg dm−3, which exceeded the maximum contaminant level of 10 μg dm−3.
Presented at the 33rd International Conference of the Slovak Society of Chemical Engineering, Tatranské Matliare, 22–26 May
2006. 相似文献
16.
The crystal structure of bis(semicarbazido)copper(II) nitrate [Cu(NH2NHC(O)NH2)2](NO3)2 has been studied by X-ray diffraction. Monoclinic crystals, a = 6.835(2) Å, b = 7.733(2) Å, c = 10.320(3) Å, β = 105.701(3)°, V = 525.1(2) Å3, space group P21/c, Z = 2, d
msd = 2.136 g/cm3, μ(MoK
α) = 2.143 mm−1. The structure was solved with the program for automatic analysis of Patterson’s function and refined by full-matrix least
squares in an anisotropic approximation for all non-hydrogen atoms using 753 independent reflections; R
1 = 0.0203. The square environment of the Cu atom is formed from the amino nitrogen atoms of the hydrazine fragments and the
C=O oxygen atoms of the two semicarbazide bidentate molecules (Cu-N 1.928 Å, Cu-O 1.999 Å). The axial positions are occupied
by the O atoms of the NO
3
−
outer-spheric anions (Cu-O 2.505 Å). In the structure, the complex cations and the NO
3
−
anions are linked into a framework by N-H...O type hydrogen bonds.
Original Russian Text Copyright ? 2007 by G. V. Romanenko, Z. A. Savelieva, and S. V. Larionov
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Translated from Zhurnal Strukturnoi Khimii, Vol. 48, No. 2, pp. 370–373, March–April, 2007. 相似文献
17.
Three tin (Ⅳ) complexes with N,N-dialkyl dithiocarbamates Ph3SnS2CN(CH3)C6H5 (1),Ph3SnS2CN(C4H8NH) (2) and Sn(Cl)2(S2CNEt2)2 (3) have been synthesized. The crystal structures have been determined by X-ray sin- gle crystal diffraction. A crystal of the complex 1 is triclinic with space group P1, a=0.9485(3)nm, b=1.0491(3)nm, c=1.3631(4)nm, α=70.996(4)°, β=72.294(4)°, γ=79.609(4)°, Z=2, V=1.2168(6)nm3, Dc=1.453g·cm-3, μ=1.234mm-1, R=0.0442, wR=0.0858. A crystal of the complex 2 is monoclinic with space group P2(1)/c, a=1.2214(2)nm, b=1.1651(2)nm, c=1.5769(3)nm,β=99.039(2)°, Z=2, V=2.2162(7)nm3, Dc=1.532g·cm-3, μ=1.352mm-1, R=0.0267, wR=0.0591. A crystal of the complex 3 is triclinic with space group P1, a=0.7179(2)nm, b=0.9256(3)nm, c=1.5327(5)nm,α=93.857(4)°,β=98.992(4)°, γ=109.481(4)°, Z=2, V=0.9405(5)nm3, Dc=1.717g·cm-3, μ=2.076mm-1, R=0.0263, wR=0.0662. In the complexes 1 and 2 the tin atoms rendered five-coordination in a distorted tigonal bipyramidal structure and in the complex 3 the tin atom rendered six-coordination in a distorted octahedron structure. CCDC: 1, 179918; 2, 180024; 3, 180004. 相似文献
18.
An extraction and preconcentration method has been developed for the determination of glyphosate and its degradation product,
aminomethylphosphonic acid (AMPA), over a broad range of concentrations (0.1–500 μg · L−1) in various aqueous matrices which differ in their ionic content. Two anion-exchange resins (the microporous Amberlite?IRA-416 and the macroporous Amberlite?IRA-900) and a commercial silica modified cartridge, ISOLUTE-NH2, were evaluated and compared. The effect of flow-rate, composition and volume of the elution solution, analyte concentration,
sample volume and porosity of the sorbents were investigated and the best experimental conditions were then used in the recovery
of the analytes from spiked natural waters. Determination of the analytes was performed by HPLC with fluorescence detection,
using FMOC-Cl as a pre-column derivatisation agent. Enrichment factors of up to 125 were achieved with the protonated ISOLUTE-NH2 cartridge allowing the determination of glyphosate at a level of 0.1 μg · L−1. Recovery rates of 99% for glyphosate and 77% for AMPA and relative standard deviations for repeatability of <10% for both
analytes were determined with the Amberlite?IRA-900 macroporous resin. 相似文献
19.
A graphite powder – ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate, BMIMPF6) paste coated gold electrode (graphite – BMIMPF6/Au) is presented. The area and the thickness of the paste film are controlled through a sticking film with a hole. The electrode
shows good stability and high electric conductivity, and K4Fe(CN)6 exhibits reversible voltammetric peaks at it. A voltammetric study of promethazine revealed that promethazine exhibits a
sensitive anodic peak in pH 6.7 buffer solutions. Under the optimized conditions, the peak current is linearly related to
the promethazine concentration in the range of 5.0 × 10−8–5.0 × 10−5 M. A 5 μM promethazine solution is measured successively for ten times with the same electrode, the relative standard deviation
(RSD) of peak current is 1.7%. The promethazine content in a Chinese medicine (i.e. Complex Reserpine) is determined. The
result is in accordance with the declared value, and the recoveries are 96.1–104%. 相似文献
20.
K. V. Yusenko I. A. Baidina E. A. Shusharina S. A. Gromilov 《Journal of Structural Chemistry》2008,49(1):170-174
The [Ru(NH3)5Cl]2[Re6S8(CN)6]·3H2O salt was obtained; its crystal structure was analyzed: a = 10.7713(9) Å, b = 13.9602(11) Å, c = 14.7956(11) Å, α = 91.961(3)°, β = 109.985(3)°, γ = 110.030(3)°, V = 1935.3(3) Å3, space group P1ˉ, Z = 2, d
calc = 3.441 g/cm3. In the cluster anion, the Re-Re distances lie in the range from 2.594 Å to 2.612 Å. For two crystallographically independent
complex cations, Ru-Nav is 2.105 Å, and Ru-Clav 2.329 Å. A pseudohexagonal motif of the structure was found.
Original Russian Text Copyright ? 2008 by K. V. Yusenko, I. A. Baidina, E. A. Shusharina, and S. A. Gromilov
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Translated from Zhurnal Strukturnoi Khimii, Vol. 49, No. 1, pp. 178–181, January–February, 2008. 相似文献