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1.
A. S. Kubasov E. Yu. Matveev E. S. Turyshev I. N. Polyakova K. Yu. Zhizhin N. T. Kuznetsov 《Doklady Chemistry》2017,477(1):257-260
The interaction of the [B10H10]2– and [B12H12]2– anions with aliphatic and aromatic nitro compounds (RNO2, where R = Et, n-Pr, i-Pr, tert-Bu, Ph) has been studied under irradiation with visible and UV light. It has been shown that, depending on the reaction conditions, both mono- and disubstituted nitro-closo-decaborates can be selectively obtained in yields up to 50%. 相似文献
2.
3.
F. Bousmina L. Zayani D. Ben Hassen-Chehimi N. Kbir-Ariguib M. Trabelsi-Ayedi 《Monatshefte für Chemie / Chemical Monthly》2003,134(5):763-768
Summary. The diagram of the ternary system Mg2+/Cl−, SO4
2−–H2O was established at 15°C by means of analytical and conductimetric measurements. Three compounds were found in this diagram,
which are MgSO4·6H2O, MgSO4·7H2O, and MgCl2·6H2O. The solubility field of MgSO4·7H2O is important whereas those of MgSO4·6H2O and MgCl2·6H2O are small. The compositions (mass-%) of the two invariant points determined by the two methods are: MgSO4:MgCl2=2.73:33.80 and MgSO4: MgCl2=3.38:28.91. Both the measured and the calculated isotherm at 15°C have been used for modelling of the diagram Mg2+/Cl−, SO4
2−–H2O between 0 and 35°C. The polythermal invariant point was approximately located between 15 and 10°C.
Corresponding author. E-mail: ariguib@planet.tn
Received October 16, 2002; accepted (revised) December 3, 2002
Published online April 24, 2003
RID="a"
ID="a" Dedicated to Prof. Dr. Heinz Gamsj?ger on the occasion of his 70th birthday 相似文献
4.
A. I. Gubanov A. M. Danilenko A. I. Smolentsev N. V. Kuratieva A. B. Venediktov S. V. Korenev 《Journal of Structural Chemistry》2016,57(8):1606-1612
Double complex salts (DCS) α-[Pd(NH3)4][IrF6]·H2O (P21/m, a = 6.3181(3) Å, b = 10.8718(5) Å, с = 7.4526(4) Å, β = 103.568(2)°), β-[Pd(NH3)4][IrF6]·H2O (P21/с, a = 8.5773(3) Å, b = 10.8791(4) Å, с = = 12.6741(3) Å, β = 122.497(2)°), [Pd(NH3)4]3[IrF6]2Cl2·H2O (P-1, a = 7.6080(2) Å, b = 7.6274(2) Å, с = 11.8070(3) Å, β = 122.497(2)°), and [Pd(NH3)4]2[IrF6]NO3 (Fm-3m, a = 11.21210(10) Å) have been synthesized and structurally characterized for the first time. The existence of polymorphs for the DCS has been revealed. The influence of the chemical composition of the initial reagents on the reaction course and, respectively, the products, has been demonstrated. A hypothesis on the influence of the second coordination sphere on the formation of one or the other polymorph of the DCS has been suggested. It has been shown that the series α-[Pd(NH3)4][МF6]·H2O (M = Pt, Pd) exhibits isostructurality. 相似文献
5.
Diamantane was synthesized in 91–97% yield by skeletal isomerization of a mixture of hydrogenated cyclohepta-1,3,5-triene dimers, pentacyclo[8.4.0.03,7.04,14.06,11]tetradecane and pentacyclo-[7.5.0.02,8.05,14.07,11]tetradecane, at a ratio of 3: 2 in the presence of ionic liquid [Et3NH]+ [Al2Cl7]–. 相似文献
6.
E. Yu. Matveev S. S. Akimov A. S. Kubasov A. I. Nichugovskii A. S. Nartov V. M. Retivov K. Yu. Zhizhin N. T. Kuznetsov 《Russian Journal of Inorganic Chemistry》2017,62(6):808-813
The reactions of 1,4-dioxane-substituted closo-decaborate anion ([B10H9O2C4H8]–) with metal acetylenides, diethyl malonate, ethyl acetoacetate, triethyl orthoformate, acetylacetone, and malonodinitrile were studied. The reactions were shown to be accompanied with substituent ring opening and attachment of the corresponding pendant functional group. The obtained compounds were characterized by various physicochemical methods (IR and polynuclear NMR spectroscopy, ESI mass spectrometry). 相似文献
7.
I. P. Pozdnyakov E. M. Glebov S. G. Matveeva V. F. Plyusnin A. A. Mel´nikov S. V. Chekalin 《Russian Chemical Bulletin》2015,64(8):1784-1795
Primary photophysical and photochemical processes were studied for PtIVBr6 2– and PtIVCl6 2– complexes in water and methanol by ultrafast kinetic spectroscopy upon excitation in the band region of charge transfer from the ligand-centered group π-orbitals to the eg*-orbital of PtIV complex anion (LMCT bands). The data obtained earlier upon excitation in the region of d—d bands were compared. Irrespective of the excitation wavelength, the photochemical properties of complexes are caused by the reactions of intermediates proceeding in the picosecond time range. These intermediates were identified as PtIVBr5 – upon photolysis of PtIVBr6 2– and, presumably, the Adamson radical pair [PtIIICl5 2–(C 4v )...Cl?] upon photolysis of PtIVCl6 2–. The difference in the exciting light wavelengths has an impact only on the first step of these processes, i.e., transition from the Franck—Condon excited state to intermediates. 相似文献
8.
Kan Zhu Zhengwen Yang Dong Yan Zhiguo Song Dacheng Zhou Rongfei Wang Jianbei Qiu 《Journal of Sol-Gel Science and Technology》2012,62(2):149-152
Tb3+–Yb3+ co-doped Ca5(PO4)3F inverse opal photonic crystals were prepared by a self-assembly technique in combination with a sol–gel method. Upconversion
luminescence characteristics of the inverse opals were investigated. The results indicate that photonic band gap has a significant
effect on upconversion luminescence of Tb3+–Yb3+ co-doped Ca5(PO4)3F inverse opal. Significant inhibition of the green or blue upconversion luminescence was inspected if the photonic band gap
overlapped with the emission band of Tb3+ ions. 相似文献
9.
P. Storoniak M. Kabir J. Błażejowski 《Journal of Thermal Analysis and Calorimetry》2008,93(3):727-732
The enthalpies of formation of PbCl4, PbCl5− and PbCl62−, originating from quantum mechanics, have enabled the thermodynamic behaviour of these ions with respect to Cl-detachment
to be assessed. The stability of salts containing PbCl5− and PbCl62− as a function of the dimensions of these anions and complementary cations was studied using an approach combining the Kapustinskii-Yatsimirskii
equation with basic thermochemical relationships.
It was found that hexachloroplumbates of monovalent metal cations will not dissociate into metal chlorides and PbCl4, provided the complementary cations are suitably large in size. Hexachloroplumbates of divalent metal cations have not yet
been synthesised since no known metal cations attain the requisite large size. Such salts will not dissociate if the divalent
metal cations are able to complex suitably large electron-donating ligands. The pentachloroplumbates of both monovalent and
divalent metal cations are unstable, since no known metal cations have appropriately large ionic radii. The approach adopted
appears to be useful for the examination of the thermal behaviour, stability and reactivity of chloroplumbates. 相似文献
10.
The optimal structures and the vibrational frequencies of H-bonded complexes formed from one-two CBr3COOH molecules or the CBr3CO 2 – anion with water molecules are calculated by density functional theory (B3LYP/6-31++G(d,p)). The comparison of the obtained results with the known Raman spectra of the CBr3COOH–H2O and NaCBr3CO 2 – ·H2O solutions (with component molar ratios of ≤1:16) shows that they include stable hydrates: CBr3COOH·H2O and CBr3CO 2 – ·(H2O)6. The first one has a cyclic form, and the second has a cubic globular form. The vibrational band frequencies of the CBr3COOH molecule and the CBr3CO 2 – anion in the spectra of both solutions are almost completely determined by the mutual arrangement of units in these hydrates. 相似文献
11.
V. V. Sharutin V. S. Senchurin O. K. Sharutina 《Russian Journal of Inorganic Chemistry》2012,57(3):398-401
The complex [(HOCH2)3CNH3] 2 + [HgI4]2? (I) was synthesized by reacting (trioxymethyl)methylammonium iodide with mercury dioide (2: 1 mol/mol) in acetone. X-ray crystallography shows that the complex consists of two types of crystallographically independent [(HOCH2)3CNH3]+ cations and tetrahedral anions [HgI4]2? (IHgI, 106.49(2)°–113.99(4)°; Hg-I, 2.7849(8)-2.8105(8) Å. [(HOCH2)3CNH3]+ cations are linked via hydrogen bonds O…H-N and O-H…N (O…N, 2.84–2.92 Å) to form polymer chains, which are cross-linked with one another via anions (I…H, 2.81, 2.82 Å). 相似文献
12.
V. V. Sharutin O. K. Sharutina V. S. Senchurin 《Russian Journal of General Chemistry》2016,86(9):2141-2142
13.
Eu (0.1, 0.5 and 1.0 mol%) doped Tb3Al5O12 (TAG) was prepared by sol–gel technique through nitrate-citrate route followed by sintering in air (1,100 °C maximum temperature).
XRD analysis showed that Eu3+ enters the TAG lattice substitutionally replacing the Tb3+ ion. Both XRD as well as FTIR investigation showed improvement in crystalline phase with the increase in the sintering temperature.
SEM and TEM analysis showed that the powder contains the particles in 5–20 nm size with almost spherical morphology. The excitation
spectrum recorded in 300–500 nm showed dominant absorption due to Tb3+ while the emission spectra recorded with 380 nm excitation had strong red emission characteristic of Eu3+. The intensity of this emission increases with the increase of the Eu concentration from 0.1 to 0.5 mol%. However, the emission
intensity decreased on further increase in Eu concentration to 1.0 mol%. This intensity variation with dopant concentration
is attributed to well-known “concentration quenching” observed in rare-earth doped materials. Reasonably strong red emission
due to Eu was observed when excited with the blue (480 nm) radiation of a Xe lamp indicating the usefulness of the material
for the realization of white light LED. 相似文献
14.
D. S. Bolotin M. Ya. Demakova E. A. Daines M. S. Avdontseva A. P. Zhdanov K. Yu. Zhizhin N. T. Kuznetsov 《Russian Journal of General Chemistry》2017,87(1):37-43
A series of closo-decaborate anions containing an O-iminoacylamide oxime fragment were synthesized by nucleophilic addition of aromatic amide oximes to 2-propionitrilium closo-decaborate anion. The isolated compounds were characterized by IR, 1H, 13C–{1H}, and 11B–{1H} NMR, and mass spectra. The structure of (Ph4P)[2-B10H9NH=C(Et)ON=C(NH2)C6H4Me-2] was determined by single-crystal X-ray analysis. 相似文献
15.
Zongxiao Li Chunlan Yuan 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2011,85(8):1332-1335
With the help of the kinetic parameters (the rate constant (k
in
k
p) and the apparent activation energy (E
in
E
p) of the oscillatory induction period and oscillation period) of the oscillating reaction using thirteen amino acids, leucine
(Leu), threonine (Thr), arginine (Arg), lysine (Lys), histidine (His), alanine (Ala), glutamine (Glu), glycine (Gly), methionine
(Met), cystine (Cys), tryptophan (Trp), serine (Ser) and tyrosine (Tyr), as organic substrates in amino acid-BrO3−-Mn2+-H2SO4-acetone system, then based on the Oregonator model and the thermodynamics theory on irreversible process, the thermodynamic
function (ΔH
in, ΔG
in, ΔS
in and ΔH
p, ΔG
p, ΔS
p) of these oscillating system are studied. The results indicate the entropy ΔS of these oscillating reaction are negative, thereby it is proved that the oscillating reaction is a noequilibrium system
with dissipation structure in agreement with the character of the oscillating reaction from disorder to order in irreversible
thermodynamics. These are satisfactorily to explain the experimental phenomena. 相似文献
16.
V. V. Sharutin I. V. Egorova N. N. Klepikov O. K. Sharutina 《Russian Journal of Inorganic Chemistry》2010,55(7):1103-1106
The complex [Ph3P] 4 + [Bi4I16]4? · 2 Me2C=O (I) was synthesized by the reaction of triphenyl(propyl)phosphonium iodide with bismuth iodide in acetone. The crystal structure of complex I was determined by X-ray crystallography. It contains, in addition to solvent molecules, two types of crystallographically independent tetrahedral tetraphenyl(propyl)phosphonium cations and tetranuclear anions [Bi4I16]4? in a chair conformation with the bismuth atoms being in an octahedral coordination. The Bi-I distances in the anion vary within 2.8768(4)–3.2524(4) Å. 相似文献
17.
Richard D. Adams Erin M. Boswell Burjor Captain Lei Zhu 《Journal of Cluster Science》2008,19(1):121-132
Three new platinum–ruthenium complexes: Pt3Ru3(PBut
3)3(CO)12, 8, Pt5Ru3(PBut
3)3(CO)12, 9 and PtRu3(PBut
3)2(CO)8(μ3-PBut)(μ-H)2, 10 were obtained from the reaction of Ru3(CO)12 with Pt(PBut
3)2. Compound 8 was obtained from this reaction when conducted at 25 °C. Compounds 9 and 10 were obtained when the reaction was conducted at 68 °C. The structure of 8 consists of a central triangular cluster of three ruthenium atoms with one Pt(PBut
3) group bridging each of the three Ru–Ru bonds. The structure of 9 consists of a capped pentagonal bipyramidal cluster of eight metal atoms that is formed formally by the addition of two platinum
atoms to 8. The structure of 10 contains a triangular cluster of three ruthenium atoms with a Pt(PBut
3) group bridging one of the Ru–Ru bonds. A t-butyl phosphido ligand formed by degradation of a molecule of PBut
3 bridges the three ruthenium atoms.
This report is dedicated to the memory of Professor F. A. Cotton for his many pioneering contributions to inorganic and metal
cluster chemistry. 相似文献
18.
H. Zhao S. Bennici J. Shen A. Auroux 《Journal of Thermal Analysis and Calorimetry》2010,99(3):843-847
The surface acidic properties of sulfated vanadia–titania catalysts prepared by various methods were investigated by adsorption
microcalorimetry, using ammonia as probe molecule. The acidic characteristics of the samples were shown to be strongly affected
by the preparation method, calcination temperature, and sulfur content. The samples prepared by sol–gel and mechanical grinding
exhibited higher acidity than co-precipitated samples. Moreover, increasing the calcination temperature of co-precipitated
samples resulted in a decrease in surface area from 402 to 57 m2 g−1 and sulfur content from around 4 to 0.2 mass%, but up to a certain point generated a stronger acidity. The optimal calcination
temperature appeared to be around 673 K. 相似文献
19.
A. Yu. Bykov G. A. Razgonyaeva N. N. Mal’tseva K. Yu. Zhizhin N. T. Kuznetsov 《Russian Journal of Inorganic Chemistry》2012,57(4):471-473
A new method of synthesis of the B3H8− anion has been suggested. The method uses the reaction of some metal halides (CuCl, SnCl2, CrCl3, PbF2, PbCl2, PbBr2, and BiCl3) with sodium tetrahydroborate. It is characterized by high (up to quantitative) yields and simplicity of isolation of the
target products ((n-C4H9)4N)[B3H8] and Cs[B3H8]. 相似文献