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The molar heat capacity of 1,4-bis(3-methylimidazolium-1-yl)butane bis(trifluoromethylsulfonyl)imide dicationic ionic compound ([C4(MIm)2][NTf2]2) has been studied over the temperature range from 6 to 350 K by adiabatic calorimetry. In the above temperature interval, this compound has been found to form crystal, liquid, and supercooled liquid. For [C4(MIm)2][NTf2]2, the temperature of fusion T°fus = (337.88 ± 0.01) K has been determined by the fractional melting experiments, the enthalpy of fusion ΔfusH° = (52.79 ± 0.28) kJ mol−1 has been measured using the calorimetric method of continuous energy input, and the entropy of fusion ΔfusS° = (156.2 ± 1.7) J K−1 mol−1 has also been evaluated. The standard thermodynamic functions of the studied dicationic ionic compound, namely, the heat capacity Cp°(T), the enthalpy [H°(T) − H°(0)], the entropy S°(T) and the Gibbs free energy [G°(T) − H°(0)] have been calculated on the basis of the experimental data for the temperature range up to 350 K. The results have been discussed and compared with those available in the literature and in the NIST Ionic Liquids Database (ILThermo) for monocationic ionic compounds. [ABSTRACT FROM AUTHOR]

The molar heat capacity of 1,4-bis(3-methylimidazolium-1-yl)butane bis(trifluoromethylsulfonyl)imide dicationic ionic compound ([C4(MIm)2][NTf2]2) has been studied over the temperature range from 6 to 350 K by adiabatic calorimetry. In the above temperature interval, this compound has been found to form crystal, liquid, and supercooled liquid. For [C4(MIm)2][NTf2]2, the temperature of fusion T°fus = (337.88 ± 0.01) K has been determined by the fractional melting experiments, the enthalpy of fusion ΔfusH° = (52.79 ± 0.28) kJ mol−1 has been measured using the calorimetric method of continuous energy input, and the entropy of fusion ΔfusS° = (156.2 ± 1.7) J K−1 mol−1 has also been evaluated. The standard thermodynamic functions of the studied dicationic ionic compound, namely, the heat capacity Cp°(T), the enthalpy [H°(T) − H°(0)], the entropy S°(T) and the Gibbs free energy [G°(T) − H°(0)] have been calculated on the basis of the experimental data for the temperature range up to 350 K. The results have been discussed and compared with those available in the literature and in the NIST Ionic Liquids Database (ILThermo) for monocationic ionic compounds.

[Display omitted] • Na 3 Cr 2 (AsO 4) 3 compound of garnet structure was synthesized via co-deposition method. • Structural characteristics were obtained by XRD, IR, microprobe analysis. • Heat capacity and thermodynamic functions between T→ 0 and 323 K were investigated. • Exothermic effect around 20 K was detected and explained. In this work the heat capacity C p , m o = f (T) of the garnet-structured Na 3 Cr 2 (AsO 4) 3 was first investigated. Measurements were performed in the range of T = (5 and 323) K using a precise adiabatic vacuum calorimeter. The phase purity and composition homogeneity were verified by X-ray diffraction analysis with Rietveld method calculations and X-ray microanalysis. The C p , m o , Δ 0 T H m 0 , Δ 0 T S m 0 a n d Δ 0 T G m 0 have been calculated using experimental data from T→ 0 to 323 K. [ABSTRACT FROM AUTHOR]

In the present study, the molar heat capacity of solid formamidinium lead iodide (CH5N2PbI3) was measured over the temperature range from 5 to 357 K using a precise automated adiabatic calorimeter. In the above temperature interval, three distinct phase transitions were found in ranges from 49 to 56 K, from 110 to 178 K, and from 264 to 277 K. The standard thermodynamic functions of the studied perovskite, namely the heat capacity C°p(T), enthalpy [H0(T) − H0(0)], entropy S0(T), and [G°(T) − H°(0)]/T, were calculated for the temperature range from 0 to 345 K based on the experimental data. Herein, the results are discussed and compared with those available in the literature as measured by nonclassical methods.

The molar heat capacity of the crystalline bis(η6-diphenyl)chromium fulleride [(η6-Ph2)2Cr] [C70] was determined by precise adiabatic calorimetry over the temperature range T = (6–350) K for the first time. The reversible glass-like transformation was detected on the heat capacity curve of [(η6-Ph2)2Cr] [C70] in the interval of T = (12–30) K, and its thermodynamic characteristics were estimated and analyzed. The fundamental thermodynamic functions, namely the enthalpy [H°(T) − H°(0)], the entropy [S°(T)−S°(0)], and the potential Φ° were calculated for the range from T → 0 to 350 K based on the experimentally determined molar heat capacity of [(η6-Ph2)2Cr] [C70] . The standard entropy of formation ΔfS° of the investigated fulleride was evaluated at T = 298.15 K. The standard thermodynamic characteristics of [(η6-Ph2)2Cr] [C70] were compared with the previously reported data for the studied bis(η6-diphenyl)chromium fulleride [(η6‑Ph2)2Cr] [C60] . [ABSTRACT FROM AUTHOR]

Graphical abstract Highlights • We report for the first time the temperature dependence of heat capacity of tetraphenylantimony benzoate. • The fusion of the compound has been specified and its standard thermodynamic characteristics were analyzed. • The thermodynamic functions of Ph 4 SbOC(O)Ph in crystalline and liquid states were calculated. • The energy of Ph 4 SbOC(O)Ph combustion was measured. • The standard characteristics of the substance formation in the crystalline state at T = 298.15 K were calculated. Abstract In the present research, the temperature dependence of the heat capacity C p , m o = f (T) of tetraphenylantimony benzoate Ph 4 SbOC(O)Ph has been measured in the range T = (5 and 480) K in the precision adiabatic vacuum and differential scanning calorimeters and reported for the first time. In the studied temperature region the melting of the compound has been revealed and its standard thermodynamic characteristics were analyzed. The standard thermodynamic functions (p ° = 0.1 MPa) of Ph 4 SbOC(O)Ph in crystalline and liquid states were calculated with the obtained experimental data: C p , m o / R , Δ 0 T H m o / R T , Δ 0 T S m o / R and Φ m o = Δ 0 T S m o – Δ 0 T H m o / T (where R is the universal gas constant) from T → 0 to 480 K. The energy of combustion of Ph 4 SbOC(O)Ph was measured. The standard enthalpy of combustion, formation enthalpy, formation entropy, Gibbs energy of formation of the substance in the crystalline state at T = 298.15 K were calculated. Comparison of thermodynamic properties was made for the derivatives of antimony studied in the present work, Ph 5 Sb and other of type Ph 3 SbX 2. [ABSTRACT FROM AUTHOR]

The temperature-dependent heat capacity of three high-purity (1-x)(0.75TeO2-0.25WO3) + xLa2O3 tellurite glass samples (x = 0.02, 0.04, and 0.06) has been determined by dynamic calorimetry in the range 320-1000 K. The experimental devitrification and heat capacity data have been used to evaluate standard thermodynamic functions: Cpo(T), enthalpy, entropy, and Gibbs energy in glassy and supercooled liquid states. We have demonstrated model-parameter similarity of properties in a statistical approach and found correlation relationships for parameters as functions of composition, which make it possible to predict the thermodynamic functions of unexplored glasses of this series. We have identified crystallization-resistant compositions of (1-x)(0.75TeO2-0.25WO3) + xLa2O3 glasses as a basis for the development of optically active elements. [ABSTRACT FROM AUTHOR]

The heat capacities of layered perovskite-like oxides NaLaTiO4 and Na2La2Ti3O10 were measured by precision adiabatic vacuum calorimetry over the temperature range of (7–350) K and by differential scanning calorimetry over the temperature range of (350–670) K. The standard thermodynamic functions: molar heat capacity Cp,m, enthalpy H(T) − H(9), entropy S(T) − S(9), and Gibbs energy −[G(T) − G(9)] of the compounds were evaluated from the experimental heat capacity temperature dependences over the range of (9–670) K. The extrapolation of heat capacity down to T = 0 K is incorrect in this case due to the considerable deviation of experimental points from fitting curves obtained on the basis of Debye’s theory. [ABSTRACT FROM AUTHOR]

In this study, dehydration I and II, polycondensation, and decarbonization processes of the thermal solid-state reaction between CoHPO⋅3HO and LiCO were observed and the LiCoPO nanoparticles were obtained. For the sample characterization, the TG/DTG/DTA, FTIR, and AAS/AES techniques were applied. Structures and morphologies were investigated by the XRD and SEM techniques, respectively. To calculate the variable activation energy ( $$E_{\alpha }$$ ) value, various isoconversional equations were used. In addition, the iterative isoconversional equations were also used to obtain the more reliable $$E_{\alpha }$$ values of 64.04 ± 3.20, 78.54 ± 3.23, 100.41 ± 6.00, and 140.07 ± 5.02 kJ mol for the first (regions I and II), second, and final steps, respectively. The first (regions I and II) as well as the second and final steps were confirmed to be a single-step kinetic process with the unique kinetic parameters. The double function $$y(\alpha )$$ and $$z(\alpha )$$ method was used to confirm the reaction mechanisms and found to be $$R_{2}$$ , $$R_{3}$$ , $$A_{3}$$ , and $$P_{3}$$ corresponding to contracting cylinder, contracting sphere, assumed random nucleation (and its subsequent growth), and nucleation processes, respectively. The studied processes lead to the formation of the final nanoparticle product LiCoPO. The four pre-exponential factors calculated using $$E_{\alpha }$$ and mechanism functions were found to be 1.01 (±0.016) × 10, 7.80 (±0.009) × 10, 4.52 (±0.010) × 10, and 1.03 (±0.003) × 10 s, respectively. The related standard thermodynamic functions of the transition-state complexes were evaluated by using the calculated kinetic parameters. [ABSTRACT FROM AUTHOR]

In the present research, the temperature dependence of heat capacity C p,m o = f ( T ) of crystalline triphenylantimony dipropionate Ph 3 Sb(OC(O)C 2 H 5 ) 2 has been measured between T = (5 and 430) K in the precision adiabatic vacuum and differential scanning calorimeters and reported for the first time. In the studied temperature region the melting of the compound has been identified and its standard thermodynamic characteristics were analyzed. The standard thermodynamic functions ( p ° = 0.1 MPa) of Ph 3 Sb(OC(O)C 2 H 5 ) 2 in crystalline and liquid states were calculated with the obtained experimental data: C p,m o / R , Δ 0 T H m o / RT , Δ 0 T S m o / R and Φ m o = Δ 0 T S m o - Δ 0 T H m o / T (where R is the universal gas constant) from T → 0 to 430 K. The standard entropy of formation of compound in the crystalline state was determined at T = 298.15 K. Also isochoric heat capacity was calculated as its atomic and lattice contributions were estimated. [ABSTRACT FROM AUTHOR]

We report the results of the study of thermodynamic properties for layered perovskite-like ferrites GdSrFeO and GdSrFeO. Isobaric heat capacity of the compounds was measured in an adiabatic calorimeter over the temperature range of 5-368 K. Low-temperature heat capacity anomalies were observed in the heat capacity curves of both compounds. Standard thermodynamic properties: molar heat capacity C ( T), reduced enthalpy Δ H ( T), entropy S ( T), and reduced Gibbs energy Φ ( T) of the oxides, were evaluated from the experimental heat capacity temperature dependence over the range of 25-370 K. [ABSTRACT FROM AUTHOR]

The heat capacities of 6-chlorouracil and 5-chlorouracil isomers were measured using a Quantum Design physical properties measurement system (PPMS) based on a heat pulse relaxation method over the temperature range from (1.9 to 300) K, and the experimental data were fitted as a function of temperature using a series of theoretical and empirical models for the appropriate temperature ranges. The results of these fits were used to calculate thermodynamic function values, C p , m 0 , △ 0 T S m o , and △ 0 T H m o from T = (0.5 to 300) K. The standard molar heat capacities, entropies and enthalpies of 6-chlorouracil and 5-chlorouracil at 298.15 K and 0.1 MPa were determined to be C p , m o = (136.94 ± 1.37) J K −1 mol −1 and (137.95 ± 1.38) J K −1 mol −1 , S m o = (156.87 ± 1.57) J K −1 mol −1 and (154.97 ± 1.55) J K −1 mol −1 and H m o = (23.01 ± 0.23) kJ mol −1 and (23.07 ± 0.23) kJ mol −1 , respectively. [ABSTRACT FROM AUTHOR]

The heat capacities of β- d -(-)-arabinose were measured using a Quantum Design Physical Property Measurement System (PPMS) over the temperature range from (1.9 to 300) K, and the experimental values were fitted as a function of temperature using a series of theoretical and empirical models in the appropriate temperature ranges, from which the corresponding thermodynamic functions were calculated. The standard molar heat capacity, entropy and enthalpy of β- d -(-)-arabinose at T = 298.15 K and P = 0.1 MPa were determined to be C p ,m o = (186.29 ± 1.86) J · K −1 · mol −1 , S m o = (181.72 ± 1.83) J · K −1 · mol −1 and H m o = (28.52 ± 0.29) kJ · mol −1 , respectively. [ABSTRACT FROM AUTHOR]

The isobaric heat capacity of monocrystalline Ca2GeO4 (olivine structure) has been measured between T = (6 and 350) K by precision adiabatic vacuum calorimetry for the first time. The experimental results have been used to calculate the standard (po = 0.1 MPa) thermodynamic functions Cp,mo/R, Δ6THmo/RT, Δ6TSmo/R and Φmo/R = Δ6TSmo/R - Δ6THmo/RT (where R is the universal gas constant) of Ca2GeO4 (cr) over the range from T = (6 to 350) K. The thermal expansion coefficient (α) of this synthetic mineral has been determined from low-temperature X-ray measurements over the range from T = (100 to 300) K. Isochoric heat capacity Сv,m/R has been calculated using this low-temperature X-ray measurements and available compressibility data. The «acoustical» and «optical» components of the isochoric heat capacity have been estimated. The «optical» component of the one are calculated from the vibrational frequencies (ν) as measured by Raman spectroscopy with different polarization at room temperature and at 1 bar. [ABSTRACT FROM AUTHOR]

Abstract: New binuclear rare-earth cymantrenecarboxylate complexes [Ln2(μ2-OOCCym)2(μ-О,η2-OOCCym)2(η2-NO3)2(η2-DME)2], Ln=Pr (1), Eu (2), Gd (3), Tb (4a), Dy (5), Ho(6a), Er (7); [Ln2(μ2-OOCCym)4(η2-NO3)2(η2-DME)2], Ln=Tb (4b), Ho(6b,c), Yb (8) and the trinuclear complex [Yb3(μ-О,η2-OOCCym)2(μ2-OOCCym)4(η2-NO3)3(η2-DME)2(H2O)2] (9) (Cym=(η5-C5H4)Mn(CO)3), DME=CH3OCH2CH2OCH3) were synthesized and characterized by X-ray diffraction. The magnetic properties of 3 are indicative of antiferromagnetic exchange between the Gd atoms. Complexes 4a and 6a were found to exhibit significant ferromagnetic interactions. It was shown that the luminescence of Eu3+ in 2 is efficiently quenched by the cymantrenecarboxylate moiety which determines the luminescent properties of this complex. For complex 4a standard thermodynamic functions were calculated from adiabatic calorimetry data. The thermal decomposition of the complexes in air affords pure LnMn2O5 phases as the final products. The magnetic properties of the LnMn2O5 phases (Ln=Gd, Ho) prepared by the thermal decomposition of 3 and 6a were studied. [Copyright &y& Elsevier]

The temperature dependences of heat capacity of copolymers on the basis of perfluorinated germanium hydrides have been measured using an adiabatic vacuum calorimeter over the temperature range from 6 K to the final temperature of their stability for the first time. Thus, the physical transformations were detected and their thermodynamic characteristics were estimated. The experimental results were used to calculate the standard thermodynamic functions, namely heat capacity, enthalpy, entropy and Gibbs function over the range from T → 0 to the final temperature stability of copolymers. The standard entropy of formation of the under study copolymers at T = 298.15 K was calculated. The obtained results were compared with corresponding data for hyperbranching perfluor polyphenylenegermaniums with other structures. Some conclusions about dependences of the thermodynamic polymers properties versus their structures were made. [ABSTRACT FROM AUTHOR]

For the first time, the heat capacity $$ C_{\text{p}}^{^\circ } $$ of poly(2-ethylhexyl acrylate) has been studied in an adiabatic vacuum calorimeter between 7 and 350 K, the standard thermodynamic functions: heat capacity $$ C_{\text{p}}^{^\circ } $$( T), enthalpy H°( T) − H°(0), entropy S°( T) − S°(0), Gibbs function G°( T) − H°(0) have been calculated from T → 0 to 350 K. The energy of combustion Δ U of the compound under study has been measured in a calorimeter with a stationary bomb and an isothermal shell. The standard enthalpy of combustion Δ H° and thermodynamic parameters of formation-enthalpy Δ H°, entropy Δ S°, Gibbs function Δ G°-at T = 298.15 K have been calculated. The results have been used to calculate the thermodynamic characteristics of 2-ethylhexyl acrylate bulk polymerization into poly(2-ethylhexyl acrylate) over the range from T → 0 to 350 K. [ABSTRACT FROM AUTHOR]

Abstract: New isostructural lanthanide cymantrenecarboxylates [Ln2(μ-О,η2-OOCCym)2(μ2-OOCCym)2(η2-ООССym)2(py)4]·2py, where Ln=Pr (1), Sm (2), Eu (3), Gd (4) and Cym=(η5-C5H4)Mn(CO)3, were synthesized and characterized by X-ray diffraction. The crystals of 1–4 are built of discrete binuclear molecules; the Ln atoms are nine-coordinate. The phases produced by thermal elimination of pyridine from complexes 3 and 4 are identical to the phases formed by elimination of THF from the THF-containing cymantrenecarboxylates prepared earlier. The magnetic properties of complex 4 indicate an enhancement of antiferromagnetic interactions between Gd3+ ions due to the substitution of THF for pyridine; in the product of ligand elimination from 4, ferromagnetic interactions were found. It was shown that the lanthanide cymantrenecarboxylates are virtually nonvolatile. The thermal decomposition of the complexes was studied by differential scanning calorimetry (DSC) and thermogravimetry (TGA). Thermolysis of 1–4 in air affords mixtures of LnMn2O5 and Mn2O3. For the earlier prepared complex [Nd2(μ2-OOCCym)4(OOCCym)2(THF)4] (5), standard thermodynamic functions were calculated from adiabatic calorimetry data. Cymantrenecarboxylate ligands appreciably suppress Eu3+ luminescence and determine the spectral and the fluorescent properties of the lanthanide cymantrenecarboxylates. [Copyright &y& Elsevier]

Abstract: In the present research, the temperature dependence of heat capacity of neopentylbenzene C6H5–C5H11 has been measured between T =(6 and 350)K in the precision adiabatic vacuum calorimeter and reported for the first time. The temperature and enthalpy of fusion of neopentylbenzene and the total mole fraction of impurities have been determined. The experimental results have been used to calculate the standard (р°=0.1MPa) thermodynamic functions and (where R is the universal gas constant) of neopentylbenzene over the range from T →(0 to 350)K. The standard entropy of formation of the compound under study at T =298.15K has been calculated. [Copyright &y& Elsevier]

Abstract: In the present research, the temperature dependence of heat capacity of crystalline bis-(η6-cumene)chromium fulleride [(η6-PhCH(CH3)2)2Cr] +[C60] − has been measured between Т =(6 and 310)K in the precision adiabatic vacuum calorimeter and reported for the first time. Also, for the first time, the temperature dependence of EPR signal parameters of bis-(η6-cumene)chromium fulleride over the range from T =(120 to 290)K was investigated by electron paramagnetic resonance. In the interval from T =(196 to 240)K the reversible endothermic transformation was detected and its thermodynamic characteristics were estimated. This transformation was caused by dissociation of dimer and formation of fulleride [(η6-PhCH(CH3)2)2Cr] +[C60] − during heating. The experimental results have been used to calculate the standard (р ° =0.1MPa) thermodynamic functions , , , and (where R is the universal gas constant) for dimeric fulleride over the range from T →(0 to 196)K and for monomeric complex [(η6-PhCH(CH3)2)2Cr] +[C60] − between Т =(240 and 310)K. [Copyright &y& Elsevier]

In this study, the temperature dependence of heat capacity C° = f( T) of crystalline bis-(η- m-xylene)molybdenum fulleride between T = (8 and 320) K was measured by precision adiabatic vacuum calorimetry. Also the temperature dependence of EPR signal parameters of bis-(η- m-xylene)molybdenum fulleride in the range from 120 to 300 K was investigated by electron paramagnetic resonance. In the interval 175-220 K the reversible endothermic transformation was detected and its thermodynamic characteristics were estimated. This transformation was caused by the dissociation of the (C) dimer in the [(η-( m-xylene))Mo][C] fulleride during heating. Based on the experimental data, the standard ( p° = 0.1 MPa) thermodynamic functions, namely, the heat capacity, enthalpy, entropy, and Gibbs function were calculated for dimeric fulleride in the interval from T → 0 to 175 K as well as for monomeric [(η-( m-xylene))Mo][C] complex between 220 and 320 K. The standard thermodynamic properties of tested fulleride and previously studied C fullerite and neutral dimer (C) were compared. [ABSTRACT FROM AUTHOR]

In this study for the first time the temperature dependences of the heat capacity C and enthalpies of physical transitions of carbosilane dendrimers with diundecylsilyl and diundecylsiloxane terminal groups of the fifth generation have been measured using the methods of precision adiabatic vacuum calorimetry and differential scanning calorimetry over the range from 6 to 580 K. In the above temperature ranges the physical transformations have been detected and their thermodynamic characteristics were estimated and analyzed. The standard thermodynamic functions: heat capacity C( T), enthalpy H°( T) − H°(0), entropy S°( T) − S°(0), and free Gibbs energy G°( T) − H°(0) and standard entropies of formation of dendrimers at T = 298.15 K have been calculated over the range from T → 0 K to 580 K. The thermodynamic properties of studied dendrimers have been compared. [ABSTRACT FROM AUTHOR]

In the present research for the first time, the heat capacity $$ C_{\text{p}}^{ \circ } $$ of crystalline tetraphenylantimony acetophenoneoxymate PhSbONCPhMe has been measured using the methods of precision adiabatic vacuum calorimetry over the range from 6 to 350 K, the standard thermodynamic functions: heat capacity $$ C_{\text{p}}^{ \circ } (T ) $$, enthalpy H°( T) − H°(0), entropy S°( T), and Gibbs function G°( T) − H°(0) have been calculated over the range from T → 0 K to 350 K. Low-temperature (20 K ≤ T ≤ 50 K) heat capacity data have shown a chain-layered structure topology of the compound under study. The energy of combustion of the compound has been determined in the isothermal combustion calorimeter with a stationary bomb. The standard thermodynamic functions of formation of crystalline PhSbONCPhMe at 298.15 K have been calculated. The differential scanning calorimetry and thermogravimetric analysis studies have shown the compound melts with decomposition and its melting temperature has been estimated. Thermodynamic properties of PhSbONCPhMe, PhSb and PhSbONCPh have been compared. [ABSTRACT FROM AUTHOR]

In the present study, the molar heat capacity of solid formamidinium lead iodide (CH5N2PbI3) was measured over the temperature range from 5 to 357 K using a precise automated adiabatic calorimeter. In the above temperature interval, three distinct phase transitions were found in ranges from 49 to 56 K, from 110 to 178 K, and from 264 to 277 K. The standard thermodynamic functions of the studied perovskite, namely the heat capacity C°p(T), enthalpy [H0(T) − H0(0)], entropy S0(T), and [G°(T) − H°(0)]/T, were calculated for the temperature range from 0 to 345 K based on the experimental data. Herein, the results are discussed and compared with those available in the literature as measured by nonclassical methods. [ABSTRACT FROM AUTHOR]

Abstract: In the present research, the temperature dependence of the heat capacity of pentaphenylantimony Ph5Sb has been measured between T =(6 and 350)K in the precision adiabatic vacuum calorimeter and from T =(327 to 415)K in the differential scanning calorimeter and reported for the first time. The melting of the sample has been observed within the above temperature range. The melting was accompanied by partial compound decomposition. The experimental results have been used to calculate the standard (p ∘ =0.1MPa) thermodynamic functions , , , and (where R is the universal gas constant) of crystalline Ph5Sb over the range from T →0K to 400K. The energy of combustion of the compound under study has been determined in the isothermal combustion calorimeter with a stationary bomb. The standard thermodynamic functions of crystalline Ph5Sb formation at T =298.15K have been calculated. [Copyright &y& Elsevier]

Abstract: In the present work, firstly the temperature dependence of heat capacity of the crystalline fullerene complex [(Me3Si)3C60]2 has been measured between T =(6 and 350)K and T =(330 and 480)K by precision adiabatic vacuum and dynamic calorimetry, respectively. The irreversible endothermic effect was detected in the temperature range from T =(400 to 466)K and its thermodynamic characteristics have been determined and analysed. This transformation was caused by the opening of a dimeric bond between fullerene fragments and the decomposition of the tested complex on heating. The experimental data were used for calculating the standard (p ∘ =0.1MPa) thermodynamic functions , , and (where R is gas constant) in the range 0 ⩽ T/K⩽400. The value of the standard entropy of formation of the complex from simple substances at T =298.15K has been estimated. [Copyright &y& Elsevier]

In the present work, the temperature dependence of heat capacity of C˚p,m = f(T) of crystalline bis-(η6-diphenyl)chromium (I) fulleride [(η6-Ph2)2Cr]+[C60]∙− has been measured by precision adiabatic vacuum calorimetry between T = (6 and 360) K with an uncertainty of ±0.2%. In this temperature interval, the transformations were detected and their thermodynamic characteristics were estimated. The experimental data were used for calculating standard (po = 0.1 MPa) thermodynamic functions C˚p,m/R, ∆T0 Hom/RT, ∆T0 Som/R and Φom/R = ∆T0 Som/R – ∆T0 Hom/ RT(where R is the universal gas constant) in the range T→(0 to 360) K. [Copyright &y& Elsevier]

• The temperature dependence of heat capacity of CsNbMoO 6 was determined. • The phase purity of sample has been confirmed by X-ray diffraction analysis. • The thermodynamic functions of CsNbMoO 6 were calculated. Firstly in the present research, the heat capacity C p , m o = f (T) of crystalline caesium niobium molybdenum oxide CsNbMoO 6 was measured in the range of T = (6 and 340) K by the precise adiabatic vacuum calorimeter. The phase purity and composition homogeneity of prepared sample have been confirmed by X-ray diffraction analysis and X-ray microanalysis. The standard thermodynamic functions (p ° = 0.1 MPa) of CsNbMoO 6 , namely C p , m o , Δ 0 T H m o , Δ 0 T S m o and Δ 0 T G m o , were calculated using the obtained experimental data from T → 0 to 340 K. The low-temperature (T < 50 K) heat capacity dependence was analyzed on the basis of the Debye heat capacity theory of solids and its multifractal model, so the characteristic temperature and the fractal dimension were determined, and chain-layered structure topology of the studied compound was established. The standard thermodynamic functions of crystalline CsNbMoO 6 formation at T = 298.15 K were calculated. [ABSTRACT FROM AUTHOR]

• We report the thermodynamic properties for fullerenol C 60 (OH) 24. • The keto-enol tautomerism was discovered and its standard thermodynamic characteristics were calculated. • Thermodynamic functions for the temperature range from T → 0 to 350 K of fullerenol C 60 (OH) 24 were calculated. In the present investigation, the heat capacity of fullerenol C 60 (OH) 24 was measured by precision adiabatic and differential scanning calorimetry over the temperature range from T = (6 to 670) K. The keto-enol tautomerism was revealed in the temperature range T = (355–575) K and enthalpy of transition was determined. The standard thermodynamic functions: molar heat capacity C p °, enthalpy H °(T) − H °(0)], entropy S °(T), and Gibbs energy G °(T) − H °(0)] of the fullerenol were determined over the temperature range from T = (6 to 350) K from the obtained experimental results. Also, DFT calculations of the heat capacities were performed. The standard thermodynamic properties of the investigated fullerenol were compared to other fullerene derivatives. [ABSTRACT FROM AUTHOR]

• Heat capacities of protonated layered oxides H x K 2 -x Nd 2 Ti 3 O 10 · y H 2 O were measured • Thermodynamic functions were calculated over the range of T = (6–300) K. • Overview on C p of NaLnTiO 4 and A 2 Ln 2 Ti 3 O 10 (A=H, Na, K; Ln = La, Nd, Gd) is presented The heat capacities of protonated layered perovskite-like oxides H 1.64 K 0.36 Nd 2 Ti 3 O 10 ·0.61 H 2 O and H 1.89 K 0.11 Nd 2 Ti 3 O 10 ·0.60 H 2 O were measured by precision adiabatic vacuum calorimetry over the temperature range of (6–300) K. The standard thermodynamic functions: molar heat capacity, enthalpy, entropy, and the Gibbs energy of the compounds were evaluated from the experimental data of the heat capacities over the temperature range of T = (6–300) K. The deviation of experimental points from fitting curves obtained on the basis of Debye's theory. The overview on low-temperature heat capacity and standard thermodynamic properties of cation-ordered layered perovskite-like titanates NaLnTiO 4 and A 2 Ln 2 Ti 3 O 10 (A=H, Na, K; Ln=La, Nd, Gd) is present. [ABSTRACT FROM AUTHOR]

• The heat capacity of bis -dioxolene cobalt complex with imino-pyridine functionalized by TEMPO moiety was determined. • Thermodynamic characteristics of the phase transition were analyzed. • The standard thermodynamic functions of above complex were calculated. Firstly in the present research, the heat capacity of bis -dioxolene cobalt complex with imino-pyridine functionalized by TEMPO moiety (TEMPO-Im-Py)Co(3,6-DBSQ) 2 was measured over the range T = (6 and 347) K by the precise adiabatic vacuum calorimeter. In the temperature interval of T = (220 to 285) K, the phase transition in the crystalline state was observed, and its standard thermodynamic characteristics were determined. The standard thermodynamic functions (p ° = 0.1 MPa) of (TEMPO-Im-Py)Co(3,6-DBSQ) 2 (cr), namely C p , m o , Δ 0 T H m o , Δ 0 T S m o and Δ 0 T G m o , were calculated using the obtained experimental data from T → 0 to 350 K. The low-temperature (T < 50 K) heat capacity dependence was analysed on the basis of the Debye heat capacity theory of solids and its multifractal model, so the characteristic temperature and the fractal dimension were determined, and chain-layered structure topology of the studied complex was established. [ABSTRACT FROM AUTHOR]