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1.
Electronic weakening mechanism of interatomic bonds in -Al2O3 catalyst under the effect of electron donors H2O, NH3, pyridine and OH– has been studied in terms of the quantum-chemical cluster approach with CNDO/2 calculations.
/2 -Al2O3 - H2O, NH3, OH–.相似文献
2.
Bernd Klingert Grety Rihs 《Journal of inclusion phenomena and macrocyclic chemistry》1991,10(2):255-265
The title metallocenium salts form crystalline 2:1 host:guest inclusion compounds with-cyclodextrin, [(5-C5H5)2M]PF6 · 2-CD · 8H2O (1, M = Fe;2, M = Co;3, M = Rh). The X-ray crystal structures of1 and3, and the lattice constants, crystal system and space group of2 have been determined. Crystal data: triclinic, space groupP1 (No. 1),Z = 1;1,a = 13.865 (2) Å,b = 13.839 (2) Å,c = 15.520 (2) Å, = 91.43 (2)°, = 85.81 (2)°, = 120.22 (2)°, andR
F
= 0.089 for 4257 observed MoK
reflections [I > 3(I)];2,a = 13.810 (2) Å,b = 13.872 (2) Å,c = 15.560 (2) Å, = 93.99 (2)°, = 87.06 (2)°, = 120.04 (2)°;3,a = 13.756 (1) Å,b = 13.863 (1) Å,c = 15.561 (2) Å, =94.39 (1)°, = 86.92 (1)°, = 119.89 (1)°, andR
F = 0.061 for 11142 observed MoK
reflections [I > 3(I)]. In the crystals of1 and3, two -cyclodextrin molecules are arranged head-to-head to form a dimer by means of intermolecular hydrogen bonding across the secondary hydroxyl faces of adjacent -CD monomers. The dimers are stacked along the crystallographicc axis to form a channel-type structure. The metallocenium cation is encapsulated within the cavity of the dimer, while the PF
6
–
anion is located outside the cavity, being centered between the primary hydroxyl faces of adjacent dimers. Eight water molecules of hydration per asymmetric unit reside in the spaces between the -CD columns. In view of the almost identical crystal data for2 a similar structure can be assumed for the cobaltocenium adduct. 相似文献
3.
K. Hirotsu S. Kamitori T. Higuchi I. Tabushi K. Yamamura H. Nonoguchi 《Journal of inclusion phenomena and macrocyclic chemistry》1984,2(1-2):215-222
Crystal and molecular structures of (1:1) molecular complexes of N,N,N,N-tetramethyl-2, 11, 20, 29-tetraaza [3.3.3.3] paracyclophane (1) with CHCl3, CH2Cl2, CH3CN and CO2 are reported. The macrocycle has square-box structure, giving hydrophobic cavity surrounded by four benzene rings. The guest molecules are included in the cavity. The uncomplexed1 was found to have a rectangular form, indicating large conformational flexibility of1. In solution,1 is achiral because rapid RS interconversion, but in solid, the macrocyclic conformation is frozen as R-conformer or S-conformer. The macrocycles with the same chirality are stacked alongb-axis to form chiral molecular columns, R-colums or S-columns. Complexes of1 crystallize differently depending on the guest molecules. R-columns (S-columns) packed alonga-axis produce R-layers (S-layers), which are further packed alongc-axis using R-layer to R-layer contact (RR) or SS and RS or SR. The crystals of1·CHCl3 are formulated as--RRR--=[R]n (Type I, chiral) and those of1·CH3CN or1·CO2 and1·CH2Cl2 are represented by [RS]n (Type IIA, racemic) and [RRSS]n (Type IIB, racemic), respectively. 相似文献
4.
Kinetic study of the thermal dehydration of syngenite K2Ca(SO4)2·H2O under non-isothermal conditions
Different calculation methods applied to TG, DTG and DTA curves obtained with a Mettler Thermoanalyzer at one or several heating rates have been tested. It has been shown that the dehydration of syngenite can best be described by the Avrami equation I [–1n(1–)]1/2=3.46·1021exp (–2.73·104/T)·t where is the degree of decomposition,T the absolute temperature, andt the time.The mean value of the activation energy is 54 kcal·mole–1. This is in good agreement with the results obtained under isothermal conditions. The method of atava and kvára, supplemented by the numerical tables of Zsakó, is most useful in obtaining the kinetic equations describing the thermal decomposition of solids.
The authors would like to thank Dr. E. M. Bulewicz of this Department for valuable discussions, and Dr. M. Szakowicz and Mr. B. Gawliczek for carrying out the measurements on the Mettler instrument at the Institute of Metallurgy at the School of Mining and Metallurgy in Cracow. 相似文献
Zusammenfassung Mit verschiedenen Berechnungsmethoden wurde anhand der TG, DTG und DTA-Kurven, die bei einer und mehreren Aufheizgeschwindigkeiten der Probe im Thermoanalysator der Firma Mettler erhalten wurden bewiesen, daß die kinetische Gleichung zur Beschreibung des Dhydratisierungsprozesses des Syngenits folgende Gestalt hat: [–1n(1–)]1/2=3.46·1021 exp (–2.73·104/T)·t (-Zersetzungsgrad,T absolute Temperatur,t-Zeit) Der Mittelwert der Aktivierungsenergie beträgt: 54 kcal·mol–1. Die Gleichung und die Werte der kinetischen Parameter stimmen gut mit den Ergebnissen der isothermen Experimente überein. Bei den Untersuchungen thermischer Reaktionen der Zersetzung von Festkörpern hat sich die Methode von atava und kvára, ergänzt durch die numerische Tabelle von Zsakó als besonders geeignet erwiesen.
Résumé Divers procédés de calcul appliqués aux courbes TG, TGD et ATD obtenues à l'aide d'un thermoanalyseur Mettler, avec une ou plusieurs vitesses de chauffage, conduisent à l'équation cinétique suivante pour exprimer le processus de déshydratation de la syngénite: [–1n (1–)]1/2=3.46·1021exp (–2.73·104/T)·t où =degré de décomposition,T=température absolute,t=temps. La valeur moyenne de l'énergie d'activation est 54 kcal·mol–1, en bon accord avec les résultats des études en conditions isothermes. La méthode de atava et kvára, combinée avec les tables numériques de Zsakó, s'est révélée la plus efficace pour l'obtention de l'équations décrivant la cinétique de la décomposition thermique des corps solides.
« » -, , . , , : [–1n(1–)]1/2=3.46·1021 exp (–2.73·104/T)·t - ,— ,t — . , 54 . –1. , . , , -log() III III.
The authors would like to thank Dr. E. M. Bulewicz of this Department for valuable discussions, and Dr. M. Szakowicz and Mr. B. Gawliczek for carrying out the measurements on the Mettler instrument at the Institute of Metallurgy at the School of Mining and Metallurgy in Cracow. 相似文献
5.
Yu. S. Vollerner S. D. Kravets A. S. Shashkov B. Tashkhodzhaev M. B. Gorovits M. R. Yagudaev N. K. Abubakirov 《Chemistry of Natural Compounds》1991,27(2):198-207
Two new glycosides of the cholestane series (allosides A and B) have been isolated from the fruit of the cocultivatedAllium suvorovii Rgi. andAllium stipitatum Rgl. (family Liliaceae, local name anzur). The acid hydrolysis of both compounds gave a sterol not previously described, which has been called alliosterol and has the structure of (22S)-cholest-5-ene-1, 3, 16, 22-tetraol, and the product of its dehvdration, which is (16S, 22S)-furost-5-ene-1, 3-diol. Alloside A is the 16-O--D-galactopyranoside, and alloside B the 16-O--D-galactopyranoside 1-O--D-glucopyranoside of alliosterol.Institute of Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 231–241, March–April, 1991. 相似文献
6.
S. R. Lukić D. M. Petrović A. F. Petrović 《Journal of Thermal Analysis and Calorimetry》1988,34(4):1015-1021
The unit cell parameters and the space group of the investigated compound were determined by means of X-ray diffraction.Analysis of the diffusion-reflection spectra of the crystalline powder and the absorption spectra of its alcoholic solutions permitted identification and quantitative characterization of the absorption bands of the crystalline complex of NiL2(ClO4)2·3H2O.Application of differential-thermal analysis allowed determination of the mechanism of thermal decomposition of the compound. From these measurements, the expected configuration of the basic molecule was verified, involving determination of the number of non-coordinated water molecules.
Zusammenfassung Mittels Röntgendiffraktionsmethoden wurden Gitterzellenkonstanten sowie die Raumgruppe der untersuchten Verbindung bestimmt. Durch Analyse der erhaltenen Diffusions-Reflexionsspektren von kristallinem Pulver und des Absorptionsspektrums einer alkoholischen Lösung der Verbindung war es möglich, die Absorptionsbanden des Kristallkomplexes NiL2(ClO4)2·3H2O zu identifizieren und quantitativ zu charakterisieren. Anwendung von Differentialthermoanalyse ermöglicht die Bestimmung des Mechanismus der Zersetzungsreaktion der Verbindung. Durch diese Messungen, einschliesslich der Bestimmung der Anzahl nichtkoordinierter Wassermoleküle, wurde die erwartete Konfiguration des Grundmoleküles überprüft.
NiL2(ClO4)2·2, L-N-- -4- . L-N---4- . , , . . , .相似文献
7.
Yu. S. Vollerner S. D. Kravets A. S. Shashkov M. B. Gorovits N. K. Abubakirov 《Chemistry of Natural Compounds》1988,24(2):183-186
A new genin of the spirostan series — anzurogenin B having the structure of 2,5-epoxy-(25R)-spirostan-3,6-diol — has been isolated form the collective fruit of the cocultivatedAllium suvorovii Rgl. andAllium stipitatum Rgl. (family Liliaceae).Institute of the Chemistry of Plant Substances, Uzbek SSR Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 218–221, March–April, 1988. 相似文献
8.
Yu. S. Zimin E. P. Talzi V. M. Nekipelov K. I. Zamaraev 《Reaction Kinetics and Catalysis Letters》1985,29(1):219-223
Synthesis and structure of (pyridine) bis(acetylacetonato) (1-methyl-1-phenylethylperoxo) cobalt(III) complex are described.
() () (III).相似文献
9.
George Maroulis 《Theoretical chemistry accounts》1992,84(3):245-253
Summary We report a study of the electric dipole-quadrupole (A
,,), quadrupole-quadrupole (C
,,), dipole-octopole (E
,) polarizability and the dipole-dipole-quadrupole (B
,,) hyperpolarizability of carbon monoxide. All values are obtained from finite-field self-consistent field (SCF) and fourth-order manybody perturbation theory (MP4) calculations. Our best values for the dipole-octopole polarizability areE
z,zzz=60.19 andE
x,xxx=–38.06e
2
a
0
4
E
h
–1
. For the dipole-dipole-quadrupole hyperpolarizability we reportB
zz,zz=–296,B
xz,xz=–170,B
xx,zz=88 andB
xx,xx=–178e
3
a
0
4
E
h
–2
. 相似文献
10.
A. A. Loloiko V. I. Grishkovets A. S. Shashkov V. Ya. Chirva 《Chemistry of Natural Compounds》1990,26(2):184-186
New triterpene glycosides have been isolated from the berries of Crimean ivyHedera taurica Carr. (family Araliaceae) — hederoside A1 (methyl ester of 3-O--D-glucopyranosylhederagenin) and hederoside D1 3-O-[O--D-glucopyranosyl]-(12)--D-glucopyranosyl]hederagenin and also the known glycosides 3-O--D-glucopyranosyloleanolic acid and 3-O-[O--D-glucopyranosyl-(12)--L-arabinopyranosyl]hederagenin. The structures of these compounds were established on the basis of the results of chemical methods and1H and13C NMR spectroscopy.M. V. Frunze Simferopol' State University. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 228–230, March–April, 1990. 相似文献
11.
Seven complex compounds exhibiting the compositions Ni(en)3Ni(CN)4·H2O (I), Ni(en)3Ni(CN)4 (II),-Ni(en)2Ni(CN)4 (III), Ni(en)Ni(CN)4·2H2O (IV), Ni(en)Ni(CN)4 (V), Ni(en)2Ni(CN)4 · 2.5H2O (VI) and-Ni(en)2Ni(CN)4 (VII) were prepared from the system Ni-en-[Ni(CN)4]2–-H2O. These compounds were examined by the methods of infrared spectroscopy, X-ray powder diffractometry, UV-VIS reflectance spectroscopy, and also by the measurement of magnetic moments. The thermal stability, the stoichiometry of thermal decomposition and the mutual transformations were investigated with a derivatograph. The reactions proceeding according to the following schemes were observed if the system was heated to appropriate temperature: (I)(II)(III)(V)(IV) and (VI)(VII)(III)(V)(IV) Process (VII)(III) represents isomerization. The reversibility of the process (V)(IV) is due to the high hygroscopicity of the anhydrous complex. The changes in structure in the course of the individual processes are discussed.
Zusammenfassung Aus einem System Ni-en-[Ni(CN)4]2–-H2O wurden sieben Komplexe der Formeln Ni(en)3Ni(CN)4·H2O (I), Ni(en)3Ni(CN)4 (II),-Ni(en)2Ni(CN)4 (III), Ni(en)Ni(CN)4·2H2O (IV), Ni(en)Ni(CN)4 (V), Ni(en)2Ni(CN)4 · 2.5H2O (VI) und-Ni(en)2Ni(CN)4 (VII) hergestellt. Diese Verbindungen wurden mittels IR-Spektroskopie, Röntgenpulverdiffraktometrie, UV-Reflexionsspektroskopie und durch Messungen des magnetischen Momentes untersucht. Die Wärmestabilität, die Stöchiometrie des thermischen Zerfalles und die gegenseitigen Umwandlungen wurden mittels eines Derivatographen untersucht. Wird das System auf geeignete Temperaturen erhitzt, kann der Reaktionsverlauf durch folgendes Schema dargestellt werden: (I)(II)(III)(V)(IV) und (VI)(VII)(III)(V)(IV).Der Prozeß (VII)(III) verkörpert eine Isomerisierung. Die Umkehrbarkeit von Prozeß (V)(IV) ist auf die ausgeprägten Hygroskopieeigenschaften des wasserfreien Komplexes zurückzuführen. Es werden die im Ablaufe der einzelnen Prozesse vorgehenden Strukturveränderungen besprochen.
Ni- -[No(N)]2 -2 Ni(en)3Ni(CN)4 · 2 (I), Ni(en)3Ni(CN)4 (II),-Ni(en)2Ni(CN)4 (III), Ni(en)Ni(CN)4-2H2O (IV), Ni(en)Ni(CN)4 (V), Ni(en)2Ni(CN)4 · 2,5H2O (VI) -Ni(en)2Ni(CN)4 (VII). , , - , . , . (I)(II)(III)(V)(IV) (VI)(VII)(III)(V)(IV). (VII)(III) . (V)(IV) . .相似文献
12.
It is shown that, in contrast to classical impregnation methods, in bimetallic catalyst production the texture of the carrier is stabilized by introducing the promoting ion on the surface of Pt/Al2O3 with vapors of CrO2Cl2 or SnCl4. This is shown by a relatively slower decrease of the specific area and the volume of the pores upon calcination.
, Pt/Al2O3- CrO2Cl2 SnCl4 . .相似文献
13.
T. T. Pangarova G. G. Zapesochnaya V. A. Chertkov 《Chemistry of Natural Compounds》1976,11(3):349-352
Summary FromRhodiola algida we have isolated a new -lactone — alginoside (I) with the composition C13H22O8, mp 192°C. It has been shown that it has the structure of-ethyl--(-D-glucopyranosyloxy)--methylbutyrolactone.The aglycone algin obtained by the hydrolysis of (I) is also a new compound, and it has the structure-ethyl--hydroxy--methylbutyrolactone.All-Union Scientific-Research Institute of Medicinal Plants. M. V. Lomonosov Moscow State University. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 334–339, May–June, 1975. 相似文献
14.
K. Lühder W. -H. B?hmer I. Stoldt K. Madeja 《Reaction Kinetics and Catalysis Letters》1992,48(1):9-15
Applying IR spectroscopy for studying the Ziegler system Co(acac)3/Mg(Bu)2 (Bu=n-butyl) in tetrahydrofuran, it could be shown that the following reactions take place: reduction of cobalt (III), exchange of the acetylacetonate groups and their interaction with Mg(Bu)2.
Co(acac)3/Mg(Bu)2 (Bu=-) - , (III), Mg(Bu)2.相似文献
15.
V. I. Kalinin A. I. Kalinovskii Sh. Sh. Afiyatullov 《Chemistry of Natural Compounds》1988,24(2):187-189
The holothurianEupentacta pseudoquinquisemita Deichmann collected in Kraternaya Bay, Ushishir Islands has yielded two triterpene pentaosides — the previously known cucumarioside C2, and cucumarioside H, which is a new glycoside. With the aid of13C NMR spectroscopy and solvolytic desulfation its structure has been determined as 6-acetoxy-3-([3-O-methyl--D-xylopyranosyl-(1 3)--D-glucopyranosyl-(1 4)] [-D-xylopyranosyl-(1 4)] [-D-xylopyranosyl-(1 2)]--D-quinovopy-ranosyl-(1 2)-(4-O-sulfato--D-xylopyranosyloxy)holosta-7,22,24(trans)-triene. Cucumarioside H was also identified inEupentacta (=Cucumaria)fraudatrix from Posyet Bay, Sea of Japan.Pacific Ocean Institute of Bioorganic Chemistry, Far Eastern Branch, USSR Academy of Sciences, Vladivostok. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 221–225, March–April, 1988. 相似文献
16.
L. S. A. Dikshitulu V. Hanumantha Rao P. Vani 《Reaction Kinetics and Catalysis Letters》1981,17(1-2):103-108
The reaction is zero order in cerium(IV), fractional order in tellurium(IV) and first oder in ruthenium(III). While the ionic strength has no effect, the rate increases with increasing [H+], and decreases with increasing [HSO
4
–
]. H and S are 54.4 kJ mol–1 and –60.3 JK–1 mol–1, respectively. A suitable mechanism is proposed.
(IV), (IV) (III). , [H+] [HSO 4 – ]. H S 54,4 –1 –60,3 ·–1·–1, . .相似文献
17.
L. García J. Palazón J. Gálvez G. López 《Journal of Thermal Analysis and Calorimetry》1989,35(1):113-120
The 1 4 complexes of cobalt (II) and manganese (II) thiocyanates with morpholine (Morph), [M(NCS)2(Morph)4] (M=Co, Mn), were prepared and studied by means of thermogravimetry, derivative thermogravimetry and differential scanning calorimetry. By thermal treatment of the above compounds, the 12 and 11 complexes, [M(NCS)2(Morph)2] (M=Co, Mn; n=1, 2), were formed. Magnetic data, infrared and electronic spectra and molar conductance values for the compounds are reported. All the complexes contain N-bonded morpholine and the 14 complexes are suggested to have a monomericcis pseudooctahedral structure with N-bonded thiocyanate, whereas the 12 and 11 complexes are considered to have a six-coordinated polymeric configuration involving bridging NCS groups.
The authors express their thanks to Dirección Regional de Universidad e Investigación de la Comunidad Autónoma de Murcia for providing financial assistance. 相似文献
Zusammenfassung Mittels. Thermogravimetrie, Derivativthermogravimetrie und Differential-Scanning-Kalorimetrie wurden die zuvor dargestellten 14 Komplexe von Kobalt(II)- und Mangan(II)thiozyanaten mit Morpholin (morph) [M(NCS)2(morph)4] mit M=Co, Mn untersucht. Durch Erhitzen obiger Verbindungen entstehen die 12- bzw. 11-Komplexe [M(NCS)2(morph)n] mit M=Co, Mn undn=1, 2. Magnetisierungsdaten, Infrarot- und Elektronenspektren sowie die molare Leitfähigkeit der Verbindungen wurden ermittelt bzw. angegeben. Alle Komplexe enthalten N-gebundenes Morpholin. Die 14 Komplexe besitzen eine monomere cis-pseudooktaedrische Struktur mit N-gebundenem Thiozyanat, während die 12- und 11-Komplexe eine hexakoordinierte polymere Struktur mit NCS-Gruppenbrücken zu besitzen scheinen.
, (.) [(S)2(.)4]. [ (S)2(.) n ], =1 2. , , . . 14 ( : ) - N- . 121 11 - , .
The authors express their thanks to Dirección Regional de Universidad e Investigación de la Comunidad Autónoma de Murcia for providing financial assistance. 相似文献
18.
L. N. Atopkina N. F. Samoshina V. A. Denisenko N. I. Uvarova 《Chemistry of Natural Compounds》1988,24(2):190-193
Glucosides have been synthesized from dammar-24-ene-3,12,17,20(S)-tetraol (betulafolienetetraol), isolated from the leaves ofBetula pendula. Condensation with -acetobromoglucose in the presence of silver oxide and silicate has given acetylated betulafolienetetraol 3- and 12- mono- and 3,12- and 3,20-di-O--D-glucopyranosides, the total yield of which amounted to 75–80%. The structures of the semisynthetic glycosides have been established on the basis of the results of IR,1H and13C NMR spectroscopy.Pacific Ocean Institute of Bioorganic Chemistry, Far Eastern Branch, USSR Academy of Sciences, Vladivostok. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 225–229, March–April, 1988. 相似文献
19.
Synthesis of thymidine 5′-(β-l-mannopyranosyl) and (4,6-dideoxy-l-lyxo-hexopyranosyl) pyrophosphates
V. N. Shibaev Yu. Yu. Kusov V. A. Petrenko N. K. Kochetkov 《Russian Chemical Bulletin》1976,25(11):2408-2411
Conclusions We have prepared thymidine 5-(-L-mannopyranosyl pyrophosphate), thymidine 5-(4,6-dideoxy--L-lyxohexopyranosyl pyrophosphate), and thymidine 5-(4,6-dideoxy--L-lyxo-hexopyranosyl pyrophosphate), all analogs of thymidine 5-(-L-rhamnopyranosyl pyrophosphate), which is involved in the biosynthesis of the O-specific chains ofSalmonella lipopolysaccharides.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2588–2591, November, 1976. 相似文献
20.
K. Wieczorek-Ciurowa J. Paulik F. Paulik 《Journal of Thermal Analysis and Calorimetry》1983,28(2):405-411
Conventional thermoanalytical curves provide little information on the thermal decomposition of Ca(NO3)2 · CO(NH2)2 · 3 H2O. In contrast from quasi-isothermal-quasi-isobaric thermogravimetric curves the mechanism can easily be interpreted. After the complex melts at 60°C, the solution formed is weight constant up to 135°C in the labyrinth crucible. The solution begins to boil at 135°C and gradually loses water, its boiling point increasing. The solution becomes saturated at 200°C. Thereafter, Ca(NO3)2 · CO(NH2)2 separates out while the boiling point does not change. After the departure of the water, the CO(NH2)2 immediately decomposes and Ca(NO3)2 remains.In an open crucible the above transformation is complicated by decomposition of typeAB
(s)=A
(s)+B
(g) solution evaporation drying of solid residue, surface crust formation, etc. In conventional thermoanalysis the latter processes accompany the above processes (melting-solution formation-loss of water during boiling) which hampers interpretation of the conventional curve.
The authors are indebted to Prof. E. Bulewicz and Prof. E. Pungor for valuable discussions.They thank Mrs. M. Kiss and Miss I. Fábián for technical assistance. 相似文献
Zusammenfassung Herkömmliche thermoanalytische Kurven liefern wenig Informationen über die thermische Zersetzung von Ca(NO3)2 · CO(NH2)2 · 3 H2O. Quasi-isotherme/quasi-isobare thermogravimetrische Kurven dagegen ermöglichen leicht eine Interpretation des Mechanismus. Nach dem Schmelzen des Komplexes bei 60°C bleibt das Gewicht der Lösung im Labyrinthtiegel bis 135°C konstant. Die Lösung beginnt bei 135°C zu sieden und verliert zunehmend an Wasser, wobei der Siedepunkt ansteigt. Die Lösung erreicht den Sättigungspunkt bei 200°C. Danach scheidet sich Ca(NO3)2 · CO(NH2)2 ohne weitere Veränderung des Siedepunktes ab. Nach Entfernung des Wassers zersetzt sich das CO(NH2)2 sofort und Ca(NO3)2 bleibt zurück.In einem offenen Tiegel wird die obige Umwandlung durch Zersetzung des TypesAB (s)= =A (s)+B(g), durch Verdampfung der Lösung, durch Trocknung des festen Rückstandes, durch Oberflächenverkrustung usw. kompliziert. Diese Prozesse begleiten bei der herkömmlichen Thermoanalyse die oben erwähnten Vorgänge (Schmelzen-Lösungsbildung-Wasserverlust durch Sieden), wodurch die Interpretation der herkömmlichen Kurven erschwert wird.
(N3)2·(N2)2·3 2O . , - , . 60° 135°. 135° . - 200°. , (N3)2 · (N2)2 . , . , ABpac.=Apac + Bpac., , , .. : — — , .
The authors are indebted to Prof. E. Bulewicz and Prof. E. Pungor for valuable discussions.They thank Mrs. M. Kiss and Miss I. Fábián for technical assistance. 相似文献