共查询到20条相似文献,搜索用时 15 毫秒
1.
Rajeev K. Sinha Edith Nicol Vincent Steinmetz Philippe Maître 《Journal of the American Society for Mass Spectrometry》2010,21(5):758-772
Gas-phase infrared photodissociation spectroscopy is reported for the microsolvated [Mn(ClO4)(H2O)
n
]+ and [Mn2(ClO4)3(H2O)
n
]+ complexes from n = 2 to 5. Electrosprayed ions are isolated in an ion-trap where they are photodissociated. The 2600–3800 cm−1 spectral region associated with the OH stretching mode is scanned with a relatively low-power infrared table-top laser, which
is used in combination with a CO2 laser to enhance the photofragmentation yield of these strongly bound ions. Hydrogen bonding is evidenced by a relatively
broad band red-shifted from the free OH region. Band assignment based on quantum chemical calculations suggest that there
is formation of water—perchlorate hydrogen bond within the first coordination shell of high-spin Mn(II). Although the observed
spectral features are also compatible with the formation of structures with double-acceptor water in the second shell, these
structures are found relatively high in energy compared with structures with all water directly bound to manganese. Using
the highly intense IR beam of the free electron laser CLIO in the 800–1700 cm−1, we were also able to characterize the coordination mode (η2) of perchlorate for two clusters. The comparison of experimental and calculated spectra suggests that the perchlorate Cl—O
stretches are unexpectedly underestimated at the B3LYP level, while they are correctly described at the MP2 level allowing
for spectral assignment. 相似文献
2.
A. K. Lyashchenko D. V. Loginova A. S. Lileev N. A. Ivanova I. A. Efimenko 《Russian Journal of Coordination Chemistry》2009,35(9):633-639
The MW-dielectric properties of aqueous solutions of K2[PtCl4] (I) and K2[PdCl4] (II) were studied at 298 and 313 K in the frequency range (12–25 GHz) corresponding to the maximum dielectric constant dispersion
for water and aqueous solutions of these salts. The low-frequency conductivities were measured. The static dielectric constant,
the dielectric relaxation time, and the enthalpy of activation of the dielectric relaxation of the solutions were determined.
Compared to pure water, in solutions of salts I and II, the orientational mobility of water molecules is increased and the network of H-bonds is violated more strongly than that
of most other ions with hydrophilic hydration. It was demonstrated for the first time that dielectric spectroscopy can be
used for analyzing complexation processes in systems containing aqua and hydroxo chloride complexes of metals. 相似文献
3.
IR-spectra of stable and metastable isomers of ruthenium nitrosocomplexes, [Ru(NO)Cl5]2? and [Ru(NO)(CN)5]2?, have been calculated within the frames of density functional theory. Frequency assignment was refined on the base of analysis of normal vibration in internal vibrational coordinates. Calculation results confirm that spectrally observed metastable states are bond isomers with ν1-ON and ν2-NO coordination. 相似文献
4.
X. X. Liu Y. Q. Sun Y. Y. Xu D. Z. Gao 《Russian Journal of Coordination Chemistry》2011,37(5):362-366
Macrocyclic and supermolecular complexes [Cu2(NiL)2Cl4] (I) and [Cd2(CuL)2Cl4] (II) (H2L = 2,3-dioxo-5,6,14,15-dibenzo-1,4,8,12-tetraazacyclo-pentadeca-7,13-diene) have been synthesized and structurally determined by X-ray diffraction and IR spectrum. Complex I crystallizes in the monoclinic system with P21/n group, a = 10.9019(15), b = 14.3589(19), c = 12.4748(17) 0A, β = 108.645(2)°, Z = 4. Complex II crystallizes in the monoclinic system with P21/n group, a = 10.9784(16), b = 14.580(2), c = 12.8904(18) Å, β = 109.339(2)°, Z = 4. 相似文献
5.
[Co(NH3)6][AuX4]X2 binary complex salts, where X = Cl? (I) and Br? (II), have been obtained and defined by element, X-ray diffraction, and thermal analyses and by IR, Raman, and electron spectroscopy. The compounds are isostructural. Their structural units are the [Co(NH3)6]3+ complex cations, the [AuX4]? complex anions, and the X? anions. The plane square environment of the gold atom is completed to an elongated bipyramid by two halide ions lying at distances Au...Cl 3.245 Å for I and Au...Br 3.362 Å for II. The thermolysis products of I and II are pure gold and cobalt metal powders when thermolysis is performed under hydrogen and a mixture of metallic gold with cobalt halide in a reaction under an inert atmosphere. 相似文献
6.
Jiaoyun Xia Yongxian Wang Gucai Li Junfeng Yu Duanzhi Yin 《Journal of Radioanalytical and Nuclear Chemistry》2009,279(1):245-252
In this paper, we investigated three ligand systems, symmetric and asymmetric pyridyl-containing tridentate ligands (L1NH2 = (bis(2-pyridylmethyl)-amino)-ethylamine, L2H = (bis(2-pyridylmethyl)-amino)-acetic acid, L3NH2 = [(6-amino-hexyl)-pyridyl-2-methyl-amino]-acetic acid) as bifunctional chelating agents for labeling biomolecules. These
ligands reacted with the precursor fac-[188Re(CO)3(H2O)3]+ and yielded the radioactive complexes fac-[188Re(CO)3L] (L = three ligands), which were identified by RP-HPLC. The corresponding stable rhenium tricarbonyl complexes (1–3) were
allowed for macroscopic identification of the radiochemical compounds. 188Re tricarbonyl complexes, with log P
o/w
values ranging from −1.36 to −0.32, were obtained with yields of ≥90% using ligand concentrations within the 10−6−10−4M range. Challenge studies with cysteine and histidine revealed the high stability properties of these radioactive complexes,
and biodistribution studies in normal mice indicated a fast rate of blood clearance and high rate of total radioactivity excretion,
primarily through the renal-urinary pathway. In summary, these asymmetric and symmetric pyridyl-containing tridentate ligands
are potent bifunctional chelators for the future biomolecules labeling of fac-[188Re(CO)3(H2O)3]+. 相似文献
7.
Jianping Liu Shuxia Wang Huan Wang Lei Yin Qianqian Xue Dawei Wang Yu Fang Huabei zhang 《Journal of Radioanalytical and Nuclear Chemistry》2017,312(3):543-555
Radiolabeled fatty acids as myocardial metabolic agent are used for detecting ischemic heart disease, however, no 99mTc-labeled fatty acids have potential use in clinical diagnosis. In this work, five fatty acid analogues labeled with 99mTc were firstly synthesized and characterized, their biological behaviors were investigated. All Radiotracers had good stability when incubated in rat serum for 3 h at 37 °C. 99mTc -CpT-12-ODPPA (8b) showed higher initial myocardial uptake (8.17% ID/g at 1 min postinjection) and good heart/blood ratio (2.58 at 30 min postinjection). 99mTc-11-dpa-OUFA (2b) as positively charged lipophilic compounds had reasonable heart uptake (5.59% ID/g at 1 min postinjection) and good retention (1.89% ID/g at 60 min postinjection). Unfortunately, no great improvement was obtained by the five 99mTc-labeled fatty acid analogues for the short myocardial retention and poor heart/liver ratios. 相似文献
8.
A. M. Chernysheva P. A. Shelyganov I. V. Kazakov A. Y. Timoshkin 《Russian Journal of General Chemistry》2017,87(4):665-669
Structural, spectral, and thermodynamic characteristics of complex amidoboranes M2[M1(NH2BH3)4] (M1 = Al, Ga; M2 = Li, Na, K, Rb, Cs) were calculated by the B3LYP/def2-SVPD quantum-chemical method. The procedure for the synthesis of these compounds by reactions of alkali metal amidoboranes with aluminum and gallium chlorides was suggested and experimentally tested. Reaction products were characterized by the NMR and IR spectroscopy and X-ray phase analysis. 相似文献
9.
L. S. Kudin D. E. Vorob’ev A. E. Grishin 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2007,81(2):147-158
The literature data on the thermochemical characteristics of negative LnCl? 4 and Ln2Cl? 7 ions (from lanthanum to lutetium inclusive) in the gas phase are systematized. The enthalpies of ion-molecular and ion-ion reactions with the participation of these ions were calculated and used to determine the enthalpies of formation of the ions for the whole lanthanide series. 相似文献
10.
Jiaoyun Xia Shu Long Junfeng Yu Yongxian Wang Zhong Cao 《Journal of Radioanalytical and Nuclear Chemistry》2009,281(3):493-499
The purpose of this work was to indirect label IgG with fac-[188Re(CO)3(H2O)3]+ and to check the radiochemical behavior of the labeled product. The compound of (bis(2-pyridylmethyl)-amino)-acetic acid
(L2H) was synthesized and labeled with fac-[188Re(CO)3(H2O)3]+. The labeling yield of 188Re(CO)3–L2H was more than 90%. The effects of protein concentration, reaction time, pH and reaction temperature of labeling of IgG with
188Re(CO)3–L2H were investigated. The conjugation conditions were optimized. The labeled product was analyzed by size exclusion HPLC and
TLC. The stability of 188Re(CO)3–L2H–IgG in vitro was high. The results of this study may be useful for [188Re(CO)3(H2O)3]+ labeling of protein for radioimmunotherapy. 相似文献
11.
12.
M. N. Sokolov A. V. Rogachev A. V. Virovets A. S. Bogomyakov 《Journal of Structural Chemistry》2018,59(1):126-130
Single crystals of Tl2[NbCl6] (1) and Tl2 [NbBr6] (2) are obtained as black needles on heating TlCl, Nb, S2Cl2 (1) and Tl, Nb, and Br2 at 400°C (2). Tl2NbBr6 also forms in the reaction of TlBr, Nb, Br2, and S at 500°C. Both compounds crystallize in the K2[PtCl6] structure type to form non-distorted octahedral [NbХ6]2– anions (Nb–Cl 2.397(4) Å and Nb–Br 2.516(2) Å). The magnetic properties of Tl2[NbBr6] in a range 5-300 K indicate an antiferromagnetic interaction between Nb4+ ion spins (d1, S = 1/2). On cooling, the compound becomes a noncollinear ferromagnet with Tc = 23 K. 相似文献
13.
14.
B. V. Slobodin L. L. Surat B. V. Shulgin A. N. Cherepanov A. V. Ishchenko R. F. Samigullina F. G. Neshov 《Russian Journal of Inorganic Chemistry》2009,54(10):1543-1550
Rhombohedral hexametavanadates K4Sr(VO3)6, K4Ba(VO3)6, Rb4 Ba(VO3)6, and Cs4Ba(VO3)6 melt incongruently in the temperature range of 491 to 600°C. Cooling of peritectic melts yields mixtures of compounds typical
of M2+O-M2+O-V2O5 systems, far from equilibrium and depending on the cooling kinetics. The vanadate Cs4Ba(VO3)6 undergoes reversible polymorphic transformation at 360°C. All compounds show broad-band luminescence with a maximum of the
luminescence spectrum at 490–590 nm with three types of excitation. The vanadates K4Sr(VO3)6 and Rb4Ba(VO3)6 show the highest luminescence intensity at room temperature. The latter is also most efficient at liquid nitrogen temperatures.
The luminescence spectra depend on the excitation of vanadates. Three hypotheses were put forward to interpret this finding.
The nature of luminescence is attributed to the relaxation of electronic excitation in [VO4]3− structural tetrahedra present in the vanadates. The performance characteristics of luminophores were determined. These luminophores
may be promising as X-ray luminescent screens, radioluminescence indicators, and light-emitting diode devices. 相似文献
15.
Li-Na Xiao Xiang Ding Zhong-Feng Tang Xiao-Dong He Jia-Ying Liao Yan-Hua Cui Chun-Hua Chen 《Journal of Solid State Electrochemistry》2018,22(11):3431-3442
LiNi0.80Co0.15Al0.05O2 (NCA) is explored to be applied in a hybrid Li+/Na+ battery for the first time. The cell is constructed with NCA as the positive electrode, sodium metal as the negative electrode, and 1 M NaClO4 solution as the electrolyte. It is found that during electrochemical cycling both Na+ and Li+ ions are reversibly intercalated into/de-intercalated from NCA crystal lattice. The detailed electrochemical process is systematically investigated by inductively coupled plasma-optical emission spectrometry, ex situ X-ray diffraction, scanning electron microscopy, cyclic voltammetry, galvanostatic cycling, and electrochemical impedance spectroscopy. The NCA cathode can deliver initially a high capacity up to 174 mAh g?1 and 95% coulombic efficiency under 0.1 C (1 C?=?120 mA g?1) current rate between 1.5–4.1 V. It also shows excellent rate capability that reaches 92 mAh g?1 at 10 C. Furthermore, this hybrid battery displays superior long-term cycle life with a capacity retention of 81% after 300 cycles in the voltage range from 2.0 to 4.0 V, offering a promising application in energy storage. 相似文献
16.
T. B. Tatarintseva O. V. Mikhailov N. I. Naumkina T. Z. Lygina 《Russian Journal of Coordination Chemistry》2005,31(2):101-107
Electrophilic substitution reactions Zn2+ M2+ (M = Mn, Co, Ni, Cu, Cd) in thin gelatin layers with immobilized zinc(II) hexacyanoferrate brought in contact with the aqueous solutions of d-element chlorides are studied. In all cases (except for Mn(II)), Zn atoms are partially replaced by all metals in question with the formation of the corresponding binuclear ZnM hexacyanoferrates(II). No complete replacement of Zn(II) to mononuclear hexacyanoferrate(II) of substituting metal occurs in neither of the cases.Translated from Koordinatsionnaya Khimiya, Vol. 31, No. 2, 2005, pp. 110–116. Original Russian Text Copyright © 2005 by Tatarintseva, Mikhailov, Naumkina, Lygina. 相似文献
17.
G. I. Smirnov L. M. Dimova A. A. Redchenko 《Russian Journal of Applied Chemistry》2004,77(8):1259-1262
Ion-exchange sorption of K+ and Na+ from their mixture on X-ray-amorphous and crystalline Sn(IV) hydrophosphates was studied. These sorbents exhibit a high selectivity for K+. Amorphous Sn(IV) hydrophosphate can be used for efficient purification of aqueous sodium salt solutions to remove potassium impurity.Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 8, 2004, pp. 1275–1278.Original Russian Text Copyright © 2004 by Smirnov, Dimova, Redchenko. 相似文献
18.
19.
S. P. Khranenko I. A. Baidina S. A. Gromilov A. V. Belyaev 《Journal of Structural Chemistry》2005,46(6):1060-1065
Powder and single crystal X-ray diffraction studies have been performed for anhydrous nitrate complexes Rb2[Pd(NO3)4] (I) and Cs2[Pd(NO3)4] (II). Crystal data for I: a = 7.843(1) Å, b = 7.970(1) Å, c = 9.725(1) Å; β = 100.39(1)°, V = 597.9(1) Å 3, space group P21/c, Z = 2, d calc = 2.918 g/cm3; for II: a = 10.309(2) Å, b = 10.426(2) Å, c = 11.839(2) Å; β = 108.17(3)°, V = 1209.0(4) Å3, space group P21/c, Z = 4, d calc = 3.408 g/cm3. The structures are formed by isolated [Pd(NO3)4]2? complex anions and alkali metal cations. The plane-square environment of the Pd atom is formed from the oxygen atoms of the monodentate nitrate groups. The geometrical characteristics of the complex anions are analyzed. Compound II has a short contact Pd...Cs 3.252 Å. 相似文献
20.
S. P. Khranenko E. A. Bykova A. V. Alexeyev A. P. Tyutyunnik S. A. Gromilov 《Journal of Structural Chemistry》2012,53(3):521-526
Four complex salts with the polyatomic [Rh(NH3)6]3+ cation are synthesized and studied by X-ray diffraction. The crystallographic characteristics of [Rh(NH3)6](WO4)Cl are determined and the structures of [Rh(NH3)6]Cl3, [Rh(NH3)6](ReO4)3·2H2O, and [Rh(NH3)6](MoO4)Cl·3H2O are solved. The features of mutual packing of the fragments are studied. 相似文献