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

• Published in: Journal of thermal analysis and calorimetry Vol. 132; no. 3; pp. 1741 - 1752
• Main Authors: Neupane, Umesh, Rai, U. S., Rai, R. N.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.06.2018; Springer; Springer Nature B.V
• Subjects: Analytical Chemistry; Chemistry; Chemistry and Materials Science; Enthalpy; Fourier transforms; Heat of mixing; Hydrogen bonding; Inorganic Chemistry; Interfacial energy; Mathematical analysis; Measurement Science and Instrumentation; Nitrobenzoic acid; Nitrophenol; NMR; Nuclear magnetic resonance; Parameters; Physical Chemistry; Polymer Sciences; Spectroscopic analysis; Thermodynamics; Intermolecular complex; Green synthesis; Thermochemistry; Phase diagram; Eutectic
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-018-7051-z

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 ( E 1 and E 2 ) 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.