Thermodynamics of triphenylantimony bis-phenylpropiolate

Highlights

• The temperature dependence of heat capacity of triphenylantimony bis-phenylpropiolate is reported for the first time.

• The fusion temperature was determined.

• The thermodynamic functions of Ph₃Sb(OC(O)CCPh)₂ in the crystalline state were calculated.

• The obtained thermodynamic data were compared with other of type Ph3SbX₂.

Abstract

In the present research the temperature dependence of the heat capacity of triphenylantimony bis-phenylpropiolate Ph₃Sb(OC(O)CCPh)₂ was measured by precision adiabatic vacuum and differential scanning calorimeters and reported for the first time. In the studied temperature region, the melting accompanying decomposition of the compound was revealed and the fusion temperature was determined as 431.5 K. By using the obtained experimental data the standard thermodynamic functions (р° =0.1 MPa) of Ph₃Sb(OC(O)CCPh)₂ in crystalline state were calculated: $C_{\text{p}}^{\text{o}}(T)$ – the heat capacity; H°(T)−H°(0) – the enthalpy; S°(T)−S°(0) – the entropy; G°(T)−H°(0) – the Gibbs energy over the temperature range from T → 0 K–450 K. The standard formation entropy of the substance in the crystalline state at T = 298.15 K were calculated. The thermodynamic data of the antimony derivative studied in the present work was compared in this study with those of Ph₅Sb and other of type Ph₃SbX₂.

Introduction

Nowadays organoelement compounds are widely studied because of their potential application in various fields of science, technology and biomedicine [1,2]. Organometallic compounds have advantages over purely organic compounds in application as catalyzers and reagents in organic synthesis [[3], [4], [5], [6], [7], [8]], as photo-catalyzer in the degradation of polymeric materials [9] as carbon dioxide absorbers [10] and as solar cells elements [11]. The organoelement compounds exhibit antioxidant, antitumor, antimalarial, and antibacterial activities [[12], [13], [14], [15], [16], [17], [18], [19], [20]] and find out an application against leishmaniasis and hepatitis C [21,22]. Also antimony derivatives are widely used for the synthesis of metal-containing macromolecular compounds that have fungicidal and biocidal property [[23], [24], [25]], heat resistance and radioresistance [26,27].

In accordance with the abovementioned facts the synthesis and research of physical and chemical properties of organic antimony complexes are actual and challenging issue.

This work is continuation of calorimetric research on standard thermodynamic properties of organic derivatives of antimony (V): pentaphenylantimony Ph₅Sb [28] and compounds of the type Ph₃SbX₂, where X is the organic substituents [[29], [30], [31], [32], [33]]. The phase transition, such as fusion and glass-formation, for organoantimony compounds were detected and their standard thermodynamic characteristics were estimated in these studies.

This research is devoted to calorimetric determination of the temperature dependence of the heat capacity $C_{\text{p,m}}^{\text{o}}=f\left(T\right)$ of triphenylantimony bis-phenylpropiolate in the temperature range T = (5–452) K, along with detection of phase transformations and evaluation of their standard thermodynamic characteristics, calculation of the standard (р° =0.1 MPa) thermodynamic functions: $C_{\text{p}}^{\text{o}}(T)$ – the heat capacity; H°(T)−H°(0) – the enthalpy; S°(T)−S°(0) – the entropy; G°(T)−H°(0) – the Gibbs energy over the temperature range from T → 0 K–450 K, and calculation of the standard formation entropy of the Ph₃Sb(OC(O)CCPh)₂ in the crystalline state at T = 298.15 K and comparison of the standard thermodynamic characteristics of triphenylantimony bis-phenylpropiolate with those of the studied earlier organoantimony (V) compounds.