Journal of Thermal Analysis and Calorimetry

, Volume 132, Issue 3, pp 1741–1752 | Cite as

Thermal, physicochemical and spectroscopic studies on some novel organic complexes obtained by green synthesis



The solid–liquid equilibrium phase diagram and thermochemical studies on two binary organic systems involving N-methylurea (MU) with 4-nitrophenol (NP) and 3-nitrobenzoic acid NBA were studied. Both systems show the formation of an equimolar intermolecular compound (IMC) and two eutectics (E1 and E2) one on either side of the IMC. Thermodynamic parameters such as heat of mixing, entropy of fusion, roughness parameter, interfacial energy and excess thermodynamic functions of intermolecular compounds and eutectics were calculated using the experimentally determined enthalpy of fusion by the DSC method. The spectroscopic studies, FTIR and NMR, of both the IMCs along with their parent compounds revealed the hydrogen bonding association between the parent moieties forming the complex. The findings were also confirmed by the appearance of new peaks in the powder XRD of the complexes in addition to their parent compounds.


Eutectic Green synthesis Intermolecular complex Phase diagram Thermochemistry 

Supplementary material

10973_2018_7051_MOESM1_ESM.docx (937 kb)
Supplementary material 1 (DOCX 936 kb)


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.Department of Chemistry, Institute of ScienceBanaras Hindu UniversityVaranasiIndia

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