Density, viscosity, surface tension, excess properties and molecular interaction of diethylene glycol (1)+1,2-propanediamine (2) at atmospheric pressure and T=293.15 K ∼ 318.15 K

Under atmospheric pressure of the laboratory (88.94 KPa), the density (rho), viscosity (eta) and surface tension (gamma) for binary mixture system of the diethylene glycol (DEG) (1) + 1,2-propanediamine (1,2-PDA) (2) were measured in different concentration ranges at T = 293.15 K similar to 318.15 K. According to the basic data of rho, eta and gamma, excess molar volumes values (V-m(E)), viscosity deviation (Delta eta), surface tension deviation (Delta y), partial molar volume (V-phi,V-1 and V-phi,V-2), apparent molar volume and and thermal expansion coeficiente (alpha(p)) were calculated and fitted by Redlich-Kister (R-K) equation, the least square method and other formulas. At the same time, the interaction between DEG (1) + 1,2-PDA (2) was also discussed by Gaussian 09, Fourier Transform infrared spectroscopy (FTIR), UV-visible spectroscopy (UV-vis), and Fluorescence spectroscopy (FLS) etc. The results were displayed that a hydrogen bond was formed between the nitrogen atom (N) on the amino group (-NH2) of 1,2-PDA and the hydrogen atom (H) on the hydroxyl group (-OH) of DEG, which took the form of HOCH2CH2OCH2CH2OH center dot center dot center dot NH2CH2CHNH2CH3. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

By conducting experiments and analysis, it was found that a hydrogen bond formed between DEG and 1,2-PDA, with a structure of HOCH2CH2OCH2CH2OH···NH2CH2CHNH2CH3.