Vapor pressures, thermodynamic stability, and fluorescence properties of three 2,6-alkyl naphthalenes.

Abstract:

:This work reports the experimental determination of relevant thermodynamic properties and the characterization of luminescence properties of the following polycyclic aromatic hydrocarbons (PAHs): 2,6-diethylnaphthalene, 2,6-diisopropylnaphthalene and 2,6-di-tert-butylnaphthalene. The standard (p(o) = 0.1 MPa) molar enthalpies of combustion, ΔcHm(o), of the three compounds were determined using static bomb combustion calorimetry. The vapor pressures of the crystalline phase of 2,6-diisopropylnaphthalene and 2,6-di-tert-butylnaphthalene were measured at different temperatures using the Knudsen effusion method and the vapor pressures of both liquid and crystalline phases of 2,6-diethylnaphthalene were measured by means of a static method. The temperatures and the molar enthalpies of fusion of the three compounds were determined using differential scanning calorimetry. The gas-phase molar heat capacities and absolute entropies of the three 2,6-dialkylnaphthalenes studied were determined computationally. The thermodynamic stability of the compounds in both the crystalline and gaseous phases was evaluated by the determination of the Gibbs energies of formation and compared with the ones reported in the literature for 2,6-dimethylnaphthalene. From fluorescence spectroscopy measurements, the optical properties of the compounds studied and of naphthalene were evaluated in solution and in the solid state.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Santos AF,Oliveira JA,Ribeiro da Silva MD,Monte MJ

doi

10.1016/j.chemosphere.2015.11.114

subject

Has Abstract

pub_date

2016-03-01 00:00:00

pages

173-81

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(15)30445-8

journal_volume

146

pub_type

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