Phase transitions properties of N,N-dimethyl-4nitroaniline

• Type: Article in International Scientific Journal
• Date: 2023

Authors

Pinheiro B.D.A. (Author) Other; Almeida A.R.R.P. (Author) FCUP; Manuel J S Monte (Author) FCUP

Journal

Title: U.Porto Journal of Engineering

Vol. 9

Pages: 77-88

Publisher: Universidade do Porto. Faculdade de Engenharia

Indexing

Scopus - 0 Citations

Other information

Authenticus ID: P-00Z-EDZ

DOI: 10.24840/2183-6493_009-005_002176

Abstract (EN): The present work reports an experimental study aiming to determine several thermodynamic properties of fusion and sublimation of the chromophore N,Ndimethyl-4-nitroaniline. This compound is commonly used as a reference in studies focused on the non-linear optical (NLO) characteristics of chromophores. Using the Knudsen mass-loss effusion method, the vapor pressures of the crystalline phase of N,N-dimethyl-4-nitroaniline were measured over the temperature range between 341.1 K and 363.5 K. The standard molar enthalpy, entropy, and Gibbs energy of sublimation were calculated from the experimental results, at 298.15 K, and compared with those given in the literature. Differential scanning calorimetry was used to determine the temperature and enthalpy of fusion, as well as the isobaric heat capacities of the crystalline compound under study. Additionally, the enthalpic and entropic contributions to N,N-dimethyl-4-nitroaniline¿s volatility were assessed, and it was determined that is greatly conditioned by enthalpic factors.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11