Thermochemical Properties of Triphenylantimony Dibenzoate Ph 3 Sb(OC(O)Ph) 2
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ICAL THERMODYNAMICS AND THERMOCHEMISTRY
Thermochemical Properties of Triphenylantimony Dibenzoate Ph3Sb(OC(O)Ph)2 D. V. Lyakaeva, A. V. Markina,*, N. N. Smirnovaa, A. V. Knyazeva, V. V. Sharutinb, and O. K. Sharutinab aLobachevsky bSouth
State University, Nizhny Novgorod, 603950 Russia Ural State University, Chelyabinsk, 454080 Russia *е-mail: [email protected]
Received December 9, 2019; revised December 9, 2019; accepted December 10, 2019
Abstract—The energy of combustion of crystalline triphenylantimony dibenzoate is measured using an isoperibolic combustion calorimeter with a static bomb at T = 298.15 K. The experimental data show that the standard enthalpy of combustion of this substance in the crystalline state is calculated for T = 298.15 K. Standard functions ∆fH° and ∆fG° of the formation of the compound in the crystalline state are calculated for T = 298.15 K. Keywords: calorimetry, enthalpy of combustion, enthalpy of formation, triphenylantimony dibenzoate DOI: 10.1134/S0036024420090162
INTRODUCTION Organic antimony derivatives have the potential to be used in the treatment of oncological diseases [1–6]; in the fight against pathogenic organisms as biocides and fungicides [7–9]; in fine organic synthesis as reagents and catalysts components [10–12]; and for preparing metal-containing polymers [13–15]. Organic antimony complexes are used in the development of new photocatalytic and thermo-radioresistant materials [16–19]. In addition, various organic antimony compounds exhibit the ability to absorb carbon dioxide [20, 21]. Due to the wide range of applications of organic pentavalent antimony derivatives, studying the physical and chemical properties of new members of this class of compounds remains a key task in many studies [22–25]. Information about the thermodynamic and thermochemical properties of promising antimony compounds is needed for calculating and optimizing technological processes that involve them. The thermodynamic properties of Ph5Sb and Ph3Sb(OC(O)Ph)2 and several other pentavalent antimony derivatives of the Ph3SbX2 type, where X denotes organic substituents, were determined via adiabatic vacuum and differential scanning calorimetry in [26–30]. Thermochemical characteristics (ΔcU°, ∆cH°, ∆fH°) of Ph3Sb(OC(O)Ph)2 are missing from the literature. In this work, we continued our calorimetric studies of the thermodynamic properties of a number of organic antimony(V) derivatives, enthalpy ΔсН° of combustion was determined, the standard enthalpy
∆fH° of formation was calculated, and standard Gibbs function ∆fG° of formation in the crystalline state of triphenylantimony dibenzoate was calculated for T = 298.15 K. EXPERIMENTAL Samples The studied compound was synthesized and identified according to the procedure in [31]. A sample of triphenylantimony dibenzoate was obtained by the authors of [31] via the oxidative addition reaction from triphenylantimony, hydrogen peroxide, and benzoic acid (molar ratio 1 : 1 : 2) in ether:
Ph3Sb + 2PhCOOH + H2O2 (1) → Ph3Sb(OC(O)Ph)2 + 2H2O. The r
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