In 2021 ENVIRON SCI POLLUT R published article about NUCLEAR-MAGNETIC-RESONANCE; POLYCYCLIC AROMATIC-HYDROCARBONS; NATURAL ORGANIC-MATTER; MICELLE-LIKE CONFORMATION; HOST-GUEST INTERACTIONS; NONCOVALENT INTERACTIONS; DIFFERENCE NMR; FULVIC-ACID; QUANTITATIVE-EVALUATION; CORRELATION TIMES in [Chaubey, Bhawna; Singh, Pooja; Pal, Samanwita] Indian Inst Technol Jodhpur, Dept Chem, Jodhpur 342037, Rajasthan, India in 2021, Cited 88. The Name is 2,6-Difluorobenzoic acid. Through research, I have a further understanding and discovery of 385-00-2. Category: isothiazole
Understanding the nature of interactions between the aromatic organic pollutants with dissolved humic acid (HA) is fundamental for the prediction of their environmental fate and subsequent development of efficient remediation methods. The present study employs solution-state H-1/F-19 NMR methods to investigate the non-covalent interaction between aqueous peat humic acid (Aldrich HA) and monoaromatic carboxylic acids (CA), viz., 2, 6 diflourobenzoic acid (DFBA) and its non-fluorinated analog, benzoic acid (BA). NMR self-diffusion measurement of HA protons confirmed micellar nature indicating possibility of encapsulation of small molecules through host-guest interaction. F-19-H-1 and H-1-H-1 saturation transfer difference (STD) experiments reveal the mode of insertion of CA into HA superstructure. The strength of interaction has been evaluated by analyzing T-1/T-2 relaxation times and self-diffusion coefficients of CA as a function of HA concentration. Association constants extracted for CA-HA complexes from NMR diffusion experiments reflected that the association between DFBA-HA (2.34 mM(-1)) is significantly higher than that of BA-HA (0.97 mM(-1)). The experimental outcome reiterated that substitution of -H with halogen atoms (-F in specific) to aromatic ring plays a dominant role in modulating the strength of association and mode of insertion of organic pollutants into HA superstructure. The present study emphasizes that AHA can be a potential remediating agent for organic contaminants due to its superior binding affinity compared to less humified extracted HA (EHA) from Karwar, Rajasthan, India.
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