bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dosimétrie Des Radiations Avec La Dithizone En Solution Dans Différents Solvants Organiques
Authors: Dejehet F. G. , Apers D. J. , Capron P. C. 
Published: September 2010

AbstractOn a déterminé les facteurs G de transformation de la dithizone, en solution dans des solvants organiques, par irradiation aux σ du 60Co.Dans le chloroforme, aux concentrations de 10−5, 2.10−5 et 10−4 mol.l−1 on trouve respectivement G(–dith.) = 13,3 ± 0,6; 13,6 ± 0,5 et 15,4 ± 2,1.Dans le dichlorométhane, à 2.10−5 mol.1−1. G(–dith.) = 11,5 ± 0,9 et, en présence de 1 % d'éthanol, G(–dith.) = 9,4 ± 0,6.Enfin, dans le cyclohexane, à 3.10−5 mol.1−1, G(–dith) = 5,9.Toutes ces valeurs ont été déterminées en présence d'oxygène. Le système Dithizone‐Chloroforme à 2.10−5 mol.1−1 peut servir de dosimètre entre 0 et 600 rads, domaine dans lequel il présente une réponse linéaire à la dose.
Confirmation de la Structure Cristalline et Moléculaire du Complexe Guanine. CuCl2.Hcl.H2O
Authors: Declercq J. P. , Debbaudt M. , van Meerssche M. 
Published: September 2010

AbstractThe crystal data and the results of two independent X‐ray structure determinations of a guanine‐copper chloride complex are compared. This two analyses, carried out with Cu and Mo radiation and involving 1403 and 1868 observed reflections respectively account for the high accuracy: the parameters could be refined to an R‐index of 0.052 and 0.038. The bond lengths of the guanine moiety as found in the two determinations agree well, the mean difference is 0.011 Å.
Ab Initio Wave Functions For Ground State Of Hydrocarbons
Authors: AndrÉ J. M. , Degand Ph. , Leroy G. 
Published: September 2010

AbstractAll‐electrons SCF‐LCAO‐MO computations for methane, ethane, propane, n‐butane, i‐butane, ethylene, propene, 1‐butene, trans‐2‐butene and acetylene are presented. The basic functions are contracted gaussian orbitals. Theoretical results are discussed and related to available experimental data.
Infrared Study of the Association Between Phenol and 1‐Azabicyclo(4,4,0)Decane (Quinolizidine) Derivatives
Authors: van Binst G. , Nouls J. C. 
Published: September 2010

AbstractThe following values of the thermodynamic functions for the association by H bonding of phenol with 1‐azabicyclo(4,4,0)decane (quinolizidine) derivatives in tetrachlorethylene solution, have been determined from infrared measurements: 1‐azabicyclo(4,4,0)decane (I): ‐ΔH°: 9.8 ± 0.5 kcal/mole, ‐ΔG°: 2.5 ± 0.5 kcal/ mole, ‐ΔS°: 24.6 ± 2 e.u.; 3(a)‐methyl‐l‐azabicyclo(4,4,0)decane (II): ‐ΔH°: 6.2 ± 0.5 kcal/mole, ‐ΔG°: 1.6 ± 0.5 kcal/mole, ‐ΔS°: 15.3 ± 2 e.u.; 3(e)‐methyl‐l‐azabicyclo(4,4,0)decane (III): ‐ΔH°: 9.4 ± 0.5 kcal/mole, ‐ΔG°: 2.4 Δ 0.5 kcal/mole, ‐ΔS°: 23.4 ± 2 e.u.; 3‐ethylidene‐2‐azabicyclo(4.4,0)decane (IV): ‐ΔH°: 9.6 ± 0.5 kcal/mole, ‐ΔG°: 2.4 ± 0.5 kcal/mole, ‐ΔS°: 24.3 ± 2 e.u. These values show a large decrease in the enthalpy of formation of the H bond complex in the case of 1,3‐diaxial interactions between the lone pair of nitrogen atom and a methyl or methylene group.
Some Constituents from Lycopodium Carolinianum L. Var. Affine Carolinianine a New Lycopodium Alkaloid
Authors: Miller N. , Hootele C. , Braekman‐Danheux C. , Braekman J. C. 
Published: September 2010

AbstractThree alkaloids: lycocernuine [II], anhydrolycocernuine [III] and carolinianine [IV] have been isolated from Lycopodium carolinianum L. var. affine together with the triterpene α‐onocerine [I]. The structure of the new alkaloid carolinianine is established and is shown to be [IV].
Organometallic Compounds. 34. A Convenient Method Of Synthesis For Haloalkyltin Compounds
Authors: Gielen M. , Topart J. 
Published: September 2010

AbstractThe reaction of organotin alcohols ϕR2Sn(CH2)n,CR'R”;OH (n = 1; R= ϕ R', R”; = H, H – n = 2; R = ϕ R', R”; = H, H; H, CH3; CH3, CH3; R = Me, ϕ R', R”; = H, CH3) with CCl4 or CBr4 in the presence of triphenylphosphine yields the corresponding halides, ϕR2Sn(CH2)n,CR'R”;X, which may readily be converted into triorganotin halides R2XSn(CH2).,CR'R”;X, good precursors of stannacyclo‐propanes and ‐butanes.
Preparation of Dideguanylstreptomycylamine and Bis‐N,N′‐(Dideguanylstreptomycyl)‐p‐Xylylene Diamine
Authors: Claes P. , Vanderhaeghe H. , Verlooy L. 
Published: September 2010

AbstractTwo dideguanyl derivatives of streptomycin were synthesized. The first compound, dideguanylstreptomycylamine, was obtained by alkaline degradation of streptomycylamine. The second, bis‐N,N′‐(dideguanylstreptomycyl)‐p‐xylylene diamine, is a “distreptomycin”; derivative prepared by catalytic reduction of the Schiff base of streptomycylamine and terephthalic aldehyde followed by alkaline deguanylation.
Long range phenomena. XIII [I]. Atypical Long Range Coupling In 1,3‐Dioxolanes. The Sign Of 2J(O2Ch2) And Differentiation In 2J(13C2–H)
Authors: Anteunis M. , Anteunis‐De Ketelaere F. , Borremans F. 
Published: September 2010

AbstractIt is found that long range phenomena involving H‐2 atoms in 1,3‐dioxolanes are “atypical”. The sign of 2J(CH2–2) is restated to be positive. Both coupling values, 2J and 4J follow a non‐monotonous series in bicyclic 4,5‐cyclano‐1,3‐dioxolanes. Finally 2J(13C2–H) was found to depend slightly on remoted substitution.
Chloration, Dégradation Chlorante et Pyrolyse Compétitives D'Alcanes en Présence de Tétrachlorure de Carbone I. L'exemple du Néopentane
Authors: Philardeau Yves , Dzierzynski Marjan , Martin René , Niclause Michel 
Published: September 2010

AbstractEn utilisant le symbolisme classique «β, μ» introduit par P. Goldfinger et al. en 1947 et par analogie avec le mécanisme «μH, YH» examiné au laboratoire en 1966, on suggère un schéma général «μH, YB» pour représenter, à l'instant initial, la réaction thermique homogène d'une substance organique μH en présence d'un corps YB, possédant au moins un atome «mobile» B (autre qu'un atome d'hydrogène).Pour éprouver la validité de ce nouveau mécanisme radicalaire en chaînes, on étudie expérimentalement, par chromatographie gazeuse, la réaction thermique du néopentane (μH) en présence de CCl4 (YB), à faible avancement, vers 450 °C et dans un réacteur «vide» en pyrex.On montre que les caractéristiques chimiques et cinétiques de la réaction, à l'instant initial, sont compatibles avec un mécanisme, qui apparaît comme un exemple particulier du schéma général «μH, YB».
Discussion of the mechanism of free‐radical pyrolyses of chloroethanes
Authors: Huybrechts G. , Katihabwa J. , Martens G. , Nejszaten M. , Olbregts J. 
Published: September 2010

AbstractThe mechanism usually proposed for the pyrolysis of 1,2‐C2H4Cl2 is discussed in terms of existing data on elementary rate constants and using the value
equation image
measured in this work for the rate constant of the reaction
equation image
This discussion is extended to the free‐radical pyrolysis of other chlorinated ethanes using recent literature data. The usual Rice‐Herzfeld mechanism is questioned in view of the discrepancy between experimental results and values predicted from the knowledge of elementary rate constants of this mechanism.
Molecular Modulation Mass Spectrometry Kinetic Study of the ClO Free Radical
Authors: Wu Ching‐Hsong , Johnston Harold 
Published: September 2010

AbstractIn complex photochemical reactions the effective mechanism may be different at low and at high light intensities, since the ratio of radicals to reactants may approach unity at high light intensities and may be 10−4 or less at low light intensities (such as sunlight). The method of flash photolysis has been highly successful in measuring the spectra and kinetics of free radicals in systems of high light intensities. In this laboratory a method named “molecular modulation spectrometry” has been developed, which measures the spectra and lifetimes of free‐radicals in lowintensity photochemical systems. Previous versions have utilized infrared and ultraviolet spectrometry. In this article the method is extended to ion‐counting mass spectrometry. The molecular‐modulation mass spectrometer was used to re‐investigate the kinetics of the CIO radical at low pressure and at low light intensities. Studies by flash photolysis have shown that the CIO radical decays by simple, second‐order kineticsmagnified imageThis study confirms the previous result found in low intensity photolysis of CI2 and O2 that the decay process is complex and dependent on inert gasmagnified imageThe change in rate law between high and low light intensities and trends exhibited by the parameters, k′ and k″, show that we still do not have a complete understanding of the mechanism of this reaction.
Les sulfates basiques mixtes de Nickel et de Zinc
Authors: Frias Rocha M. Ferreira Da , Glibert J. 
Published: September 2010

AbstractThe stable basic sulfates of nickel and zinc, precipitated at 20° by NaOH, are tetrabasic and tribasic respectively.Experiments with mixed NiSO4‐ZnSO4 solutions, over a wide concentration range (500 Zn+ +/1 Ni+ + to 0,002 Zn+ +/1 Ni+ +), have evidenced the formation of solid solutions.In the case of high Zn+ +‐concentrations in the initial solution, a 3 Zn(OH)2. ZnSO4‐type compound is formed, in which Zn‐atoms progressively have been replaced by Ni‐atoms within the sulfate layers. Saturation is attained at (Ni+ +/Zn+ +)lattice = 1/3. When the Zn+ +‐concentration is low, a 4 Ni(OH)2. NiSO4‐type compound is formed, in which Zn‐atoms have taken the place of some Ni‐atoms in the hydroxide layers, up to a ratio (Zn+ +/Ni+ +)lattice = 1/4.In the intermediate range, there is a progressive evolution of the basicity index. The distribution factor F, characterizing equilibrium between precipitate and final solution, (Zn+ +/Ni+ +)lattice = F(Zn+ +/Ni+ +)sol., is about 4 when Zn is in the majority, but is about 1000 when Ni is predominating. This means that there exists a highly selective incorporation of Zn into the basic sulfate of Ni.
Sélénazolidines II. Alcoylation, Acylation, et Tautomérie Anneau‐Chaîne Ouverte des Sélénazolidines
Authors: Draguet C. , Renson M. 
Published: September 2010

AbstractLa N‐acylation des sélénazolidines peut se réaliser par un chlorure d'acide dans la pyridine. Si on travaille en présence de soude aqueuse, il y a hydrolyse du cycle avec formation de N‐Se dibenzoylcystéamines.Un barbotage d'air supplémentaire forme des N‐N′ dibenzoyl séléno cystamines.L'alcoylation des sélénazolidines est une Se‐alcoylation.La tautomérie anneau‐chaîne ouverte de ce cycle est discutée.
Sélénazolidines III. Synthèse de Sélénazolidines À Partir D'Aziridines Asymétriques. Méthyl‐4 et Diméthyl‐4,4 Sélénazolidines
Authors: Draguet C. , Renson M. 
Published: September 2010

AbstractNous décrivons la synthèse de sélénazolidines à partir d'aziridines asymétriques. Nous obtenons ainsi des monométhyl‐4 ou diméthyl‐4, 4 sélénazolidines. Le sens d'ouverture du cycle aziridine est prouvé par des méthodes chimiques sûres.
La Décomposition Thermique du Chlorochromate de Potassium
Authors: Mahieu B. , Ladriere J. , Cambier J. , Apers D. , Capron P. 
Published: September 2010

AbstractThe slow thermolysis of potassium chlorochromate is studied by means of thermogravimetric and differential thermal analysis. The nature of intermediate compounds is determined by X‐ray diffraction and labelling by radioactive tracers. Effluent gases are analysed by potentiometric titrations. In this way, the overall reaction
equation image
is verified and the different decomposition steps are elucidated.
Stability Constants of the Ag(I) Complexes of Some Amino‐Alcohols
Authors: Poucke L. C. Van , Eeckhaut Z. 
Published: September 2010

AbstractThe stability constants of the Ag(I) complexes of nine amino‐alcohols have been determined at 25.0±0.1 ° and in an ionic medium of 0.5 M KNO3. Because of the high values of k2/k1 the formation curves are very steep and it was preferable to calculate the stability constants from pH and pAg measurements. No relationship was found between the acidity constants of the ligands and the stability constants of the Ag(I) complexes.
Anodic Dissolution of Lithium in LiClO4‐Ethylene Carbonate Electrolytes
Authors: Heerman L. , Baelen J. Van 
Published: September 2010

AbstractThe anodic dissolution of lithium in LiClO4‐ethylene carbonate solutions is complicated by the formation of a film on the electrode effecting a decrease of its activity. This film is not the normal product of the anodisation of lithium metal but is the product of a chemical reaction with the solvent or traces of water in the electrolyte. Anodic dissolution at higher current densities results in a partial breakdown of the film which accounts for an increase of the standard exchange current density from 1,47±0,25 mA/cm2 to 3,28±0,64 mA/cm2 at 40°.
The Electrical Resistivity of Hexagonal Ni1‐xS
Authors: Pauwels L. J. , Maervoet G. 
Published: September 2010

AbstractElectrical resistivity measurements are carried out from 4.2° to 800 °K on sintered hexagonal Ni1‐xS powder compacts. All samples appear to be metallic at room temperature. Ni1.00S and Ni0.98S exhibit a sudden resistivity increase that shifts towards lower temperature with increasing non‐stoichiometry; the transition no longer occurs for No0.96S and Ni0.94S. After the transition, the resistivity has a constant value down to 4.2 °K. By means of the energy level diagram an explanation is proposed for this remarkable phenomenon, which results from the combination of a constant carrier concentration and a constant mobility. It is concluded that only in the case of extremely stoichiometric NiS, an actual metal‐to‐semi‐conductor transition will occur. In the presence of even a very slight non‐stoichiometric deviation, the magnetic ordering gives rise to a metal‐to‐semimetal transition. The occurrence of a transformation into rhombohedral NiS, when heating the samples, depends on the amount of non‐stoichiometry.
The Hg 6(3P1) photosensitized reactions of 3‐methylcyclohexene
Authors: Maré George R. De 
Published: September 2010

AbstractThe major products of the reaction at 26° are H2, CH4, C2H4, cis‐ and trans‐1,3‐pentadiene, methylcyclohexane and an isomer of the substrate. Two modes of quenching of the Hg 6(3P1) atoms are presumed to occur: paraffinic type quenching into the C‐H bonds of the molecule and quenching into the CH bond to form vibrationally excited triplet molecules which undergo allylic C‐C and C‐H bond cleavage. Under initial conditions the ratio of trans‐ to cis‐1,3‐pentadiene formed is ≥ 2.0. This can be explained by assuming that the 1,3‐pentadiene is formed in its s‐cis triplet state.
Differential Cryoscopy in Ternary Systems, System Cl(Li‐Cs) + H2O and Associated Binaries
Authors: Vilcu Rodica , Irinei Florica 
Published: September 2010

AbstractThe cryometric depressions determined of the LiCl + H2O and CsCl + H2O binary, solutions as well as the LiCl + CsCl + H2O ternary solution, at several concentrations, up to the 3 molality, through a process of rigourous differential cryometry. From the experimental data, the activity coefficients of the dissolved electrolytes were deduced in the binary systems, as well as in the ternary systems. The deviation from additivity of the global activity coefficients of the two ternary system electrolytes in regard to the activity coefficients of the binary systems, were attributed to specific effects of the system under study.By means of the deviation functions, the excess free energies of the ternary system were computed, at the freezing point of the solutions, as well as the Harned coefficients of the system.
Étude de Complexes Accepteur‐Donneur par Spectrométrie Infrarouge IV. Comparaison des Complexes SbCl3‐Acétophénone et SbCl3‐Benzophénone Formés en Solution dans Quelques Solvants
Authors: Lecl Nedden G. Ère‐Zur 
Published: September 2010

AbstractInfrared intensity measurements of the free C = 0 band have been used to investigate the complex formation between antimony trichloride and benzophenone in various solvents. The dissociation constants of the SbCl3. acetophenone complexes are plotted versus those of the SbCl3. benzophenone complexes in the same solvents and a straight line is obtained.
Vibrational Spectra of Mono‐ and Polymethylene Diphosphonic Acids
Authors: van Haverbeke L. , Desseyn H. O. , Herman M. A. 
Published: September 2010

AbstractThe Raman and Infrared spectra of H2O3P‐(CH2)n‐PO3H2, n being 1, 2, 3, 4 and 6 have been recorded.The vibrational assignments of PO3H2 were studied, together with their behaviour in different aggregational states.Attention was given to the v(P‐C) assignment. Both a symmetric and an asymmetric one arise when the two phosphorus atoms are attached to the same carbon, while in the higher homologues they are fairly close to one another, giving a single band.
Sulfuration du Cuivre par le Soufre Dissous en Milieu Benzénique
Authors: Labar Ch. , Breckpot R. 
Published: September 2010

AbstractThe sulphidation of copper by Sa dissolved in benzene has been studied in the concentration range 0.1‐5.0 Sa g liter−1 and in the temperature range 283‐313 °K. The continuous films observed have a composition varying with the progression of the reaction; the cristallographic study has shown that these films are constituted successively by the different phases: Cu1.97S (II) and (III), Cu2‐xS (II) (x varying from 0.18 to 0.45) and CuS (I). The variation of the cristallographic parameter of the C. F. C. digenitoïde phase, Cu2‐xS (II), has made it possible to follow the progression of the sulphidation by XR analysis.The kinetic study has been made by the radioactive tracer method. The sulphidation is a succession of different reaction mechanisms: initiation period (1), diffusion in the liquid phase (2), mixed diffusion (3), diffusion in the solid phase (4) (through the sulfides film itself). A systematic study of the main processus (2) and (4) has made it possible to define the fundamental parameters of the reaction (velocity constants: K (2) (298°K) = 73.3 γ cm−2 min−1. g−1 liter; K (4) (298 °K) = 4.7 10−7 cm Cu1.80S (II). 10−4 sec; activation energies: ΔK = −4.7 kcal. mole Cu1.80S (II)−1 for mechanism (2); ΔH= ‐11.2 keal. mole Cu1.80S (II)−1 for mechanism (4)). The diffusion in the solid phase follows an inverse logarithmic kinetic relationship and can be explained by the formation mechanism of thin corrosion films (Mott and Cabrera's theory).
The Molar Heat of Reversible Adsorption at the Air‐Solution Interface in Correlation with Biological Activity
Authors: Vochten R. , Pétré G. 
Published: September 2010

AbstractAus Messungen von der Oberflächenspannung in Funktion der Temperatur, wird für wässerige Lösungen von einige normale Alkohole, die molare reversible Adsorptionswärme bestimmt.Für einige biologische Experimenten in vitro ist eine bedeutungsvolle Korrelation nachgewiesen worden zwischen die Adsorptionswärme und die Alkoholkonzentration für 50% inhibition der biologische Experimenten.
Synthesis of 2‐amino‐4‐mercapto‐s‐triazine (5‐aza‐thiocytosine)
Authors: De Lannoy J. , Nasielski‐Hinkens R. 
Published: September 2010

Abstract2‐Amino‐4‐mercapto‐s‐triazine (IV), an analog of cytosine, has been prepared from cyanuric chloride by a three steps synthesis and by cyclisation of guanylthiourea with ethyl formate.The mass spectra of compounds III, IV and V have been investigated and fragmentation patterns are presented which account for most of the major ions. Preliminary biological tests are reported.
Étude de la Formation de Lactones Penta‐Atomiques sur les Positions 2,3 des Benzo(B)Furanne, Benzo(B)Thiophène et Benzo(B)Sélénophène
Authors: Christiaens L. , Renson M. 
Published: September 2010

AbstractLa déshydratation des acides hydroxyméthylés sur les positions 2,3 ou 3,2 du benzo(b)sélénophène conduit aux deux lactones isomères. Dans le benzo(b)thiophène, seule la lactone dont le groupement carbonyle est en position 3 a pu être obtenue par cette méthode.La lactone isomère a cependant pu être synthétisée à partir du nitrile alcool correspondant par l'intermédiaire d'un iminoester interne. Dans le cas du benzofuranne, aucune des deux lactones n'a pu être obtenue quelle que soit la méthode employée. Nous discutons les raisons de cette différence de comportement.
The Acid‐Catalysed Reaction of Cyanogen Chloride with Aliphatic Alcohols. A General Synthesis of Aliphatic Carbamates
Authors: Fuks Robert , Hartemink Marinus A. 
Published: September 2010

AbstractA general synthesis of aliphatic carbamates has been worked out starting from 1 mole of cyanogen chloride and 2 moles of an aliphatic alcohol giving 1 mole of the corresponding carbamate and 1 mole of the alkyl chloride in yields ranging from 75 to 98%. The reaction is catalysed with 1 to 10 moles % of dry HCl as catalyst and takes place at room temperature.The reaction of cyanogen chloride with 1,6‐hexanediol yields 60% 1,6‐hexamethylenedicarbamate and 1,6‐dichlorohexane and 40% ω‐chlorohexylcarbamate.
Spectral and Chemical Evidence for the Structure of C‐Nor‐D‐Homoconessine
Authors: van De Woude G. , van Hove L. 
Published: September 2010

AbstractThe rearranged product resulting from the action of lithium aluminium hydride upon holarrhenine tosylate (IV) in ether solution has been tentatively formulated by Uffer as C‐nor‐D‐homoconessine (V).We found that holarrhenine mesylate (III) is converted into the same rearranged product on reacting with sodium borohydride in refluxing alcohol. The spectroscopic analysis of the rearranged product confirms the proposal of Uffer and gives results which completely parallel those obtained by Lukacs et al. in their study on the product of the reaction of the sulfonic esters of 12β‐hydroxyconanineConanine = 3‐dedimethylamino‐5, 6‐dihydroaonessine, cf. conessine (II) in chart I.
with aluminium dichlorohydride. Further converging data are afforded by a reaction sequence involving consecutive Hofmann degradations of the rearranged product (V).
I. Les Sulfates Basiques Mixtes de Nickel et de Cobalt
Authors: Frias Ferreira Da Rocha M. , Glibert J. 
Published: September 2010

AbstractWhen precipitated by NaOH, the basic mixed nickel‐cobalt sulphates form at 20°C a solid solution ranging from 4 Ni (OH)2. NiSO4 to 4 Co(OH)2. CoSO4.X‐ray diffraction and I.R.‐absorption permit to follow the Ni/Co substitution process. The results are brought together in a distribution curve: (Ni++/Co++)prec. against (Ni++/Co++)final sol..A change in the slope of the curve corresponds to the saturation of the basic nickel sulphate with cobalt and to the transition to a solid solution with the characteristics of the basic cobalt sulphate.The distribution factor remains close to unity, cobalt exhibiting a preference to occupy the sulphated layers.
Influence du pH Sur L'adsorption de L'ion Manganeux
Authors: Roy R. , Cogneau M. A. , Debuyst R. , Apers D. J. 
Published: September 2010

AbstractL'ion manganeux présente des variations du taux d'adsorption en fonction du pH de la solution et en fonction du temps de contact entre le Mn(II) et l'adsorbant (Al2O3).Ces phénomènes sont contrôlés par voie chimique grâce à l'utilisation de traces de manganèse radioactif (54Mn) ainsi que par résonance paramagnétique électronique (R.P.E.).
Vibrational Assignments and Normal Co‐Ordinate Analysis of Dichloro‐, Dibromo‐ and Monobromomalononitrile
Authors: van Haverbeke L. , Desseyn H. O. , van Der Veken B. J. 
Published: September 2010

AbstractThe infra‐red and Raman spectra of C12C(CN)2, Br2C(CN)2, and HBrC(CN)2 have been recorded.The fundamentals were assigned and a normal co‐ordinate analysis has been made using the method of BECHER and MATTES.
II. Les Sulfates Basiques Mixtes de Nickel et de Cobalt
Authors: Da Rocha M. Frias Ferreira , Glibert J. 
Published: September 2010

AbstractThe basic sulphates of nickel and cobalt, precipitated at 40°C, have a basicity index of 4, just as at 20°C, and form a continuous solid solution.At 75°C, the index remains 4 for the basic cobalt sulphate, whereas the nickel salt is degraded to reach a composition of approximately 20 Ni(OH)2. NiSO4. At first amorphous, this compound presents afterwards, By aging, a structure very near to Ni(OH)2. This transformation affects the mixed nickel‐cobalt basic sulphates in the nickel‐rich range and influences the evolution of the distribution curve, which is obtained from the (Ni++/(Co++) ratios in the precipitates and the final solutions.