Experimental and theoretical study on the 1:1 supramolecular complexes of formamide with adrenaline

Non-covalent interactions between epinephrine and nitroaromatic compounds: A DFT study

Here, we present a density functional theory (DFT) study of hydrogen bonding and π-π stacking interactions between epinephrine and different aromatic nitro-compounds in gas phase as well as in methanol solvent. Detail investigations of hydrogen bonding and π-π interactions are performed and confirmed on the basis of theoretical IR spectra, natural bond orbital (NBO) analysis, non-covalent interaction (NCI), chemical reactivity descriptors and electronic spectra. Among different functionals used for the calculation, the results obtained from ωB97XD functional are found to be more suitable to describe the hydrogen bonding and π-π stacking phenomenon for our considered systems. Weakening of hydrogen bonding and π-π stacking interaction on solvent incorporation is observed. Electronic transition between different orbitals and transition probabilities of epinephrine and nitro-aromatic complexes are described using time dependent density functional theory (TD-DFT) method.

Experimental and theoretical study on the hydrogen bonding between dopamine hydrochloride and N,N-dimethyl formamide

The hydrogen bonding between dopamine hydrochloride (DH) and N,N-dimethyl formamide (DMF) were investigated by UV-visible spectra (UV-Vis), cyclic voltammetry (CV) and density functional theory (DFT). It was found that the position of UV-Vis absorption band and the anodic/cathodic peak potentials of DH were all affected by the concentrations of DH in DMF. It was suggested that hydrogen bonding were formed between DH and DMF, which was confirmed by the DFT results. AIM analyses were performed to elucidate the nature of the hydrogen bonding in the mixtures.