共查询到20条相似文献,搜索用时 15 毫秒
1.
Fatma Hamurcu Ayla Balaban Gündüzalp Servet ?ete Birgül Erk 《Transition Metal Chemistry》2008,33(1):137-141
Metal complexes derived from amides; N,N′-bis(2-thiophenecarboxamido)-1,3-diamino propane (1) and N,N′-bis(2-furancarboxamido)-1,3-diaminopropane (2) were characterized by elemental analysis, spectral (NMR, FT-IR, LC-MS) methods, magnetic moment, molar conductance, and TGA/DTA
studies. The complexes were dimeric and have the general formula [ML.Clm.(H2O)n]2Cl2 where M=Cu(II), Zn(II), Co(III); m = 1, 2; n = 0, 1. The antimicrobial activities of the amides and their complexes were studied against the bacteria; Escherichia coli (ATCC 11230), Yersinia enterocolitica (ATCC 1501), Bacillus magaterium (RSKK 5117), Bacillus cereus (RSKK 863), Bacillus subtilis (RSKK 863) and yeast; Candida albicans (ATCC 10239). 相似文献
2.
Platinum(II) extraction by N,N′-dipentylethylenediamine-N′-thiocarbaldehyde from 0.1 M HCl into chloroform and toluene diluents was studied at 25°C and a phase contact time of 5 min.
The extraction had a coordination mechanism with a Pt ← S bond formed in the extracted complex PtCl2S2. Concentration constants and thermodynamic parameters of the extraction reaction were calculated.
Original Russian Text ? R.A. Khisamutdinov, Yu.I. Murinov, 2009, published in Zhurnal Neorganicheskoi Khimii, 2009, Vol. 54,
No. 1, pp. 156–162. 相似文献
3.
T. D. Batueva A. V. Radushev L. G. Chekanova V. Yu. Gusev V. I. Karmanov 《Russian Journal of Inorganic Chemistry》2009,54(1):145-150
Some physical and chemical properties of aliphatic acid N′N′-dioctylhydrazides[RC(O)NHN(C8H17)2] (DOHs) were studied in comparison to 2-ethylhexanoic acid N′N′-dialkylhydrazides, namely, solubility, acid-base properties, entrainment with an aqueous phase, and partition factors depending
on the medium and the acyl radical length. The pH ranges of maximal extraction of copper(II) complexes by DOHs to kerosene
and the effect of ammonium salts on copper(II) extraction were determined. The compositions of extracted complexes were determined
(Cu(II): DOH = 1: 1 and 1: 2); the extraction constant K
extr was calculated for the CuL2 complex with butyric acid N′N′-dioctylhydrazide.
Original Russian Text ? T.D. Batueva, A.V. Radushev, L.G. Chekanova, V.Yu. Gusev, V.I. Karmanov, 2009, published in Zhurnal
Neorganicheskoi Khimii, 2009, Vol. 54, No. 1, pp. 146–150. 相似文献
4.
E. Makrlík P. Vaňura P. Selucky V. A. Babain I. V. Smirnov 《Journal of Radioanalytical and Nuclear Chemistry》2011,288(1):233-238
Extraction of microamounts of calcium and strontium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B−) in the presence of N,N,N′,N′-tetraisobutyl-2,6-dipicolinamide [T(iBu)DPA, L] has been investigated. The equilibrium data have been explained assuming
that the species HL+, HL2
+, CaL2
2+, SrL2
2+ and SrL3
2+ are extracted into the organic phase. The values of extraction and stability constants of the cationic complexes in nitrobenzene
saturated with water have been determined. 相似文献
5.
E. Makrlík P. Vaňura P. Selucky V. A. Babain I. V. Smirnov 《Journal of Radioanalytical and Nuclear Chemistry》2010,283(3):839-844
Extraction of microamounts of europium and americium by a phenyltrifluoromethyl sulfone (FS 13) solution of hydrogen dicarbollylcobaltate
(H+B−) in the presence of N,N,N′,N′-tetraethyl-2,6-dipicolinamide (TEtDPA, L) has been investigated. The equilibrium data have been explained assuming that the
species HL+,
\textHL 2 + , {\text{HL}}_{ 2}^{ + } ,
\textML23 + {\text{ML}_{2}^{3 +}} and
\textML 3 3+ {\text{ML}_{ 3}^{ 3+}} (M3+ = Eu3+, Am3+) are extracted into the organic phase. The values of extraction and stability constants of the cationic complex species in
FS 13 saturated with water have been determined. It was found that the stability constants of the corresponding complexes
\textEuLn 3+ {\text{EuL}}_{n}^{ 3+ } and
\textAmLn 3+ {\text{AmL}}_{n}^{ 3+ }, where n = 2, 3 and L is TEtDPA, in the mentioned FS 13 medium are comparable. 相似文献
6.
N^6,N^6-二甲基腺嘌呤(DMAP)是生物分子的组成部分,在决定生物分子的活性和构型性能方面起到了重要作用。羟基自由基(·OH)可与DMAP反应,改变其结构,从而影响它的生物功能。因此有必要了解DMAP与·OH反应的具体过程。本文运用量子化学方法从理论上研究了·OH与DMAP的反应机理。根据反应的能垒及产物的稳定性,DMAP与·OH最可能的反应是·OH夺取DMAP的N(6)甲基H、N(9)H以及·OH加成到DMAP的C(8)位。N(6)位的甲基化提高了腺嘌呤的反应活性,也影响了其与·OH的反应机理。 相似文献
7.
R. B. Gujar S. A. Ansari A. Bhattacharyya P. K. Mohapatra A. S. Kanekar P. N. Pathak V. K. Manchanda 《Journal of Radioanalytical and Nuclear Chemistry》2011,288(2):621-627
The radiolytic stability of a branched diglycolamide extractant, namely N,N,N′,N′-tetra-2-ethylhexyl diglycolamide (T2EHDGA) dissolved in n-dodecane containing several phase modifiers, viz. N,N-dihexyloctanamide (DHOA), tri-n-butyl phosphate (TBP), 1-decanol and iso-decanol has been investigated. The distribution ratio of Am(III) decreased with
increased radiation dose studied up to 1000 kGy. Nevertheless, all the composition of extractants showed satisfactory results
up to 500 kGy, beyond which the extractants degraded drastically. The stripping behaviour of Am(III) with 0.2 M HNO3 was found to be unaffected even with the ligand solution irradiated up to 1000 kGy. Extraction of fission product and structural
elements was also investigated using the irradiated solvents and was found to be not significantly affected with increasing
absorbed dose with the exception of Mo which showed sharp rise in the distribution coefficient values. Loading of Nd in the
organic phase decreased with the irradiated solvent due to degradation of the carrier. The effect of the absorbed dose on
physical parameters such as density, viscosity and interfacial tension of the solvents has also been investigated. 相似文献
8.
Shafqat Nadeem Muhammad Khawar Rauf Saeed Ahmad Masahiro Ebihara Syed Ahmed Tirmizi Sarfaraz Ahmed Bashir Amin Badshah 《Transition Metal Chemistry》2009,34(2):197-202
Palladium(II) complexes of thiones having the general formula [Pd(L)4]Cl2, where L = thiourea (Tu), methylthiourea (Metu), N,N′-dimethylthiourea (Dmtu), and tetramethylthiourea (Tmtu) were prepared by reacting K2[PdCl4] with the corresponding thiones. The complexes have been characterized by elemental analysis, IR and NMR spectroscopy, and
two of these, [Pd(Dmtu)4]Cl2 · 2H2O (1) and [Pd(Tmtu)4]Cl2 (2), by X-ray crystallography. An upfield shift in the >C=S resonance of thiones in 13C NMR and downfield shift in N–H resonance in 1H NMR are consistent in showing sulfur coordination with palladium(II). The crystal structures of the complexes show a square-planar
coordination environment around the Pd(II) ions with the average cis and trans S–Pd–S bond angles of 89.64° and 173.48°, respectively.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.
An erratum to this article can be found at 相似文献
9.
Solution equilibrium studies on Cu2+–L1–L2 ternary systems have been performed by pH-potentiometry, UV–Vis spectrophotometry and EPR methods (L1 corresponds to polyamines such as ethylenediamine (en), diethylenetriamine (dien), or N,N,N′,N′,N″-pentamethyldiethylenetriamine (Me5dien) and L2 represents 1-aminoethylphosphonic acid (α-alaninephosphonic acid)). The obtained results suggest the formation of heteroligand complexes with [Cu(L1)(α-Ala(P))] stoichiometry in all studied systems. Additionally, in the system with en the [Cu(en)(α-Ala(P))H−1]− species is formed in basic solution. Our spectroscopic results indicate tetragonal geometry for the [Cu(en)(α-Ala(P))] species, geometry slightly deviated from square pyramidal for the [Cu(dien)(α-Ala(P))] complex and strongly deviated from square pyramidal towards trigonal bipyramidal for the [Cu(Me5dien)(α-Ala(P))] species. The coordination modes in these heteroligand complexes are discussed. 相似文献
10.
Anna Kamecka Barbara Kurzak Julia Jezierska Agnieszka Wo?na Marcin Broda 《Structural chemistry》2010,21(2):347-355
Solution equilibrium studies on the Cu(II)-polyamine-(aminomethyl)phosphonic acid (glycinephosphonic acid) ternary systems
(polyamine: ethylenediamine (en), diethylenetriamine (dien), N,N,N′,N′,N″-pentamethyldiethylenetriamine (Me5dien)) have been performed by pH-potentiometry, UV–vis spectrophotometry and EPR methods. The obtained results suggest the
formation of the heteroligand complexes with [Cu(A)(Gly(P))] stoichiometry in all studied systems. Additionally, in the systems
with dien the protonated [Cu(dien)(H–Gly(P))]+ species also exists in acid solution and in the system with en the [Cu(en)(Gly(P))H-1]− species is formed in the basic solution. Our spectroscopic results indicate the tetragonal geometry for the [Cu(en)(Gly(P))]
species, the geometry slightly deviated from square pyramidal for the [Cu(dien)(Gly(P))] complex and strongly deviated from
square pyramidal towards trigonal bipyramidal for the [Cu(Me5dien)(Gly(P))] species. The coordination modes in these heteroligand complexes are discussed. 相似文献
11.
A high-yield straightforward conversion of lactams to lactim ethers is shown by the conversion of (10H)-dipyrrin-1-ones to (11H)-dipyrrin-1-ol methyl and ethyl ethers in 90% yield from heating in neat trimethyl or triethyl phosphite at 160°C. Unlike
the parent dipyrrinones, which form intermolecularly hydrogen-bonded dimers in CHCl3, their lactim ethers are shown to be monomeric by vapor pressure osmometry. The latter react with boron trifluoride etherate
to N,N′-bridged BF2 derivatives that exhibit strong fluorescence (φF 0.6–0.8) near 535 nm. X-Ray crystal structures were obtained of the lactim ethyl ether of kryptopyrromethenone and the BF2 derivative of the lactim ethyl ether 2,3-diethyl-7,8-dimethyl-(10H)-dipyrrin-1-one. 相似文献
12.
A. El Abd 《Journal of Radioanalytical and Nuclear Chemistry》2010,284(2):321-326
The thermal neutron cross-sections and resonance integrals of the 186W (n,γ) 187W and 98Mo (n,γ) 99Mo reactions in the thermal and 1/E regions, respectively, of a thermal reactor neutron spectrum have been experimentally determined by the activation method
using 197Au (n,γ) 198Au reaction as a single comparator. The high purity natural W, Mo, and Zr foils; and Au wire diluted in aluminum, were irradiated
without Cd shield in two neutron irradiation sites, characterized with different values for the thermal-to-epithermal flux
ratios, f at the Second Egyptian Research Reactor (ETRR-2). The induced activities in the samples were measured by high-resolution
γ-ray spectrometry with a calibrated germanium detector. Thermal neutron cross-sections for 2200 m/s neutrons and resonance
integrals for the 186W (n,γ) 187W and 98Mo (n,γ) 99Mo reactions have been obtained relative to the reference values, σ0 = 98.65 ± 0.09 b and I
0 = 1500 ± 28 b for the 197Au (n,γ) 198Au reaction. The necessary correction factors for thermal neutron and resonance neutron self-shielding effects, and the epithermal
flux index (α) were taken into account in the determinations. The results obtained were: σ0 = 38.43 ± 0.4 b and I
0 = 502 ± 65 b for 186W (n,γ) 187W, and σ0 = 0.137 ± 0.014 band I
0 = 6.47 ± 0.8 for 98Mo (n,γ) 99Mo. These results are discussed and compared with previous measurements and evaluated data in literature. The traditional
method of determining thermal cross-sections and resonance integrals via neutron irradiation with and without Cd shield in
one irradiation position was avoided in this work by neutron irradiation without Cd shield in at least two different neutron
irradiation positions. This method provides alternative way for determining thermal cross-sections and resonance integrals
simultaneously. 相似文献
13.
K. A. Chernyshev L. B. Krivdin G. N. Rozentsveig I. V. Ushakova I. B. Rozentsveig G. G. Levkovskaya 《Russian Journal of Organic Chemistry》2008,44(1):76-85
The second-order polarization propagator approach (SOPPA) was used to calculate 13C-1H, 13C-13C, and 15N-1H coupling constants for a series of N-(polychloroethylidene)arenesulfonamides and N’-arylsulfonylformimidamides, and their configuration with respect to the C=N bond was determined by comparing the calculated
data with the experimental values. All the examined compounds were found to exist in solution exclusively as the corresponding
E isomers. The most favorable conformations and relative energies of the E and Z isomers in the gas phase were determined in terms of the second-order perturbation theory (MP2/6-311G**). N’-Arylsulfonylformimidamides are characterized by restricted internal rotation of the dialkylamino group about the C-N bond
having an increased order.
Original Russian Text ? K.A. Chernyshev, L.B. Krivdin, G.N. Rozentsveig, I.V. Ushakova, I.B. Rozentsveig, G.G. Levkovskaya,
2008, published in Zhurnal Organicheskoi Khimii, 2008, Vol. 44, No. 1, pp. 82–91.
Dedicated to Full Member of the Russian Academy of Sciences G.A. Tolstikov on his 75th anniversary 相似文献
14.
Theoretical study on the hydrolysis mechanism of N,N -dimethyl- N ′-(2′,3′-dideoxy-3′-thiacytidine)formamidine 总被引:1,自引:0,他引:1
The hydrolysis mechanisms of N,N-dimethyl-N′-(2′,3′-dideoxy-3′-thiacytidine)formamidine (FA-3TC) in the gas phase and in aqueous solution were studied by use of the
density functional theory B3LYP/6-31+G(d, p) method. Two possible reaction pathways in the title reaction were considered.
In one pathway water attacks the C=N double bond first (path A) while in the other water attacks the C-N single bond first
(path B). The calculated results indicate that the first step in both pathways is the rate-limiting process and path A is
more favorable than path B in the gas phase. The effect of solvent water on the title reaction was assessed at the B3LYP/6-31+G(d,
p) level of theory based on the polarizable continuum model (CPCM). In water the first mechanism (path A) is also favored.
Supported by the National Natural Science Foundation of China (Grant Nos. 20473055 and 20773089) and the Scientific Research
Foundation for the Returned Overseas Chinese Scholars, State Education Ministry (Grant No. 20071108-18-15) 相似文献
15.
The reaction of the Schiff base salicylideneaminopyridine with [M(sac)2(H2O)4] · 2H2O, where M is copper(II) or zinc(II), and sac is the saccharinate anion, results in the formation of the new tris(saccharinato) complexes ApyH[Cu(N-sac)2
(O-sac)(H2O)2] (1) and ApyH[Zn(N-sac)3(H2O)] (2), which have been characterized by elemental analyses, magnetic measurements, FT-IR spectroscopy, thermal analysis and X-ray diffraction. The Schiff base did not coordinate to the metal ions, but decomposed during the reaction, forming a 2-aminopyridinium cation ApyH, which remained outside the coordination sphere as a counter ion. (1) and (2) are the first examples of mononuclear tris(saccharinato) complexes of copper(II) and zinc(II). Both complexes are isomorphous with the triclinic space group P-1, (1) consisting of an ApyH cation and a [Cu(sac)3(H2O)2]– anion in which the copper(II) ion has trigonal bipyramidal surroundings. The sac ligands in (1) exhibit unusual and non-equivalent coordination, behaving as ambidentate ligands. One of them coordinates to the metals through the carbonyl oxygen atom, while the other two sac ligands are bonded to the metals via the imino nitrogen atom. The zinc(II) ion in (2) is tetrahedrally coordinated by three N-donor sac ligands and an aqua ligand. The crystal structures of (1) and (2) are stabilized by intermolecular hydrogen bonds and aromatic – stacking interactions. 相似文献
16.
Franz A. Mautner Christian Gspan Mohamed A. S. Goher Morsy A. M. Abu-Youssef 《Monatshefte für Chemie / Chemical Monthly》2005,17(6):107-117
Four new polynuclear complexes: [Zn(2picNO)(N3)2]n, [Zn(4Mepym)(N3)2]n, [Cd(2picNO)(N3)2]n, and [Cd(4Mepym)(N3)2]n (2picNO=2-picoline-N-oxide and 4Mepym=4-methylpyrimidine) have been synthesized and characterized by single-crystal X-ray diffraction. The structures of the zinc(II) complexes feature five-coordinate zinc atoms, (-1,1) azido bridges, monodentate organic ligands, and 1D chains. The cadmium(II) azide complexes contain distorted octahedral metal atoms linked by alternate di-(-1,1) and di-(-1,3) azido bridges in cis arrangement and these chains are connected by 2picNO bridges giving a honeycomb 2D framework or by 4Mepym bridges forming extended 2D network structure. 相似文献
17.
Franz A. Mautner Christian Gspan Mohamed A. S. Goher Morsy A. M. Abu-Youssef 《Monatshefte für Chemie / Chemical Monthly》2005,136(2):107-117
Summary. Four new polynuclear complexes: [Zn(2picNO)(N3)2]n, [Zn(4Mepym)(N3)2]n, [Cd(2picNO)(N3)2]n, and [Cd(4Mepym)(N3)2]n (2picNO=2-picoline-N-oxide and 4Mepym=4-methylpyrimidine) have been synthesized and characterized by single-crystal X-ray diffraction. The structures of the zinc(II) complexes feature five-coordinate zinc atoms, (-1,1) azido bridges, monodentate organic ligands, and 1D chains. The cadmium(II) azide complexes contain distorted octahedral metal atoms linked by alternate di-(-1,1) and di-(-1,3) azido bridges in cis arrangement and these chains are connected by 2picNO bridges giving a honeycomb 2D framework or by 4Mepym bridges forming extended 2D network structure. 相似文献
18.
High Resolution Laser Excitation Spectra and Franck-Condon Factors of A2Π-X2Σ+ Electronic Transition of MgF 下载免费PDF全文
Jingwang Gu Zengjun Xiao Chunting Yu Qiang Zhang Yang Chen Dongfeng Zhao 《化学物理学报(中文版)》2022,35(1):58-68
Magnesium monofluoride (MgF) is proposed as an ideal candidate radical for direct laser cooling. Here, the rotationally resolved laser spectra of MgF for the A2Π-X2Σ+ electronic transition system were recorded by using laser induced fluorescence technique. The MgF radicals were produced by discharging SF6/Ar gas mixtures between the tips of two magnesium needles in a supersonic jet expansion. We recorded a total of 19 vibrational bands belonging to three sequences of Δv=0, ±1 in the region of 348-370 nm. Accurate spectroscopic constants for both X2Σ+ and A2Π states are determined from rotational analysis of the experimental spectra. Spectroscopic parameters, including the Franck-Condon factors (FCFs), are determined from the experimental results and the Rydberg-Klein-Rees (RKR) calculations. Significant discrepancies between the experimentally measured and RKR-calculated FCFs are found, indicating that the FCFs are nearly independent of the spin-orbit coupling in the A2Π state. Potential energy curves (PECs) and FCFs determined here provide necessary data for the theoretical simulation of the laser-cooling scheme of MgF. 相似文献
19.
T. E. Kokina R. F. Klevtsova E. M. Uskov L. A. Glinskaya Yu. A. Bryleva S. V. Larionov 《Journal of Structural Chemistry》2010,51(5):942-948
It is revealed that at 300 K Sm(Phen)(i-Bu2PS2)3 (I) and Sm(2,2′-Bipy)(i-Bu2PS2)3 (II) complexes have photoluminescence properties typical of the Sm3+ ion. In the spectra, three bands are observed with 7nmax = 564 nm, 600 nm, and 645 nm. Single crystals of Sm(Phen)(i-Bu2PS2)3·MeCN (III) are grown, and the structure of the compound is determined based on the X-ray diffraction data (X8 Apex diffractometer,
MoK6h radiation, 7685 F
hkl, R = 0.0258). Crystals of III are triclinic, unit cell parameters are a = 11.0554(3) ?, b = 15.0446(3)?, c= 15.4849(4)?; 6h = 89.218(1)°, β = 75.555(1)°, γ = 73.484(1)°, V= 2386.6(1)?3, Z=2, ρcalc = 1.391 g/cm3, P1 space group. The structure of III is formed from the molecules of mononuclear complex I and MeCN molecules. A coordination polyhedron of the Sm atom is an N2S6 tetragonal antiprism. It is shown that the structure of III includes dimeric assemblies of the molecules of complex I. 相似文献
20.
鉴于含硅-过渡金属键化合物作为催化剂具有重要的应用价值, 在我们最近发现的化合物(η5,η5-C5H4Me2SiSi-Me2C5H4)Fe2(CO)4 (1)的硅硅键和铁铁键复分解重排反应可以有效地合成含有两个硅铁键的环状化合物[Me2Si-η5-C5H4- Fe(CO)2]2 (2)的基础上, 对该硅铁键环状化合物的三苯基膦取代衍生物[Me2Si-η5-C5H4-Fe(CO)(PPh3)][Me2Si-η5-C5H4Fe(CO)2-n(PPh3)n] (3: n=0, 5: n=1)的合成方法进行了研究. 发现化合物1在三苯基膦存在下的复分解重排反应是合成单三苯基膦取代产物3的最好方法; 而双三苯基膦取代化合物5则可通过光照条件下2与三苯基膦发生羰基取代反应而得到, 产物中含有的顺反异构体可利用制备薄层色谱法分离. 利用X射线衍射法测定了化合物3的分子结构, 考察了三苯基膦配体的存在对分子结构的影响以及三苯基膦与铁形成的配位键的稳定性. 相似文献