Influence of Polymerization Conditions and Postdeposition Oxidation on Polydopamine Film Characteristics.

Polydopamine (PDA) is widely used as a universal surface modification layer due to its strong adhesion and chemical versatility. However, the properties of PDA films can vary significantly depending on polymerization conditions and postdeposition handling. In this study, we hypothesize that oxygen availability during deposition and subsequent exposure to air after film formation critically influence the physical structure and chemical reactivity of PDA coatings.

Hydrogen-bond rearrangements in the self-association and microhydration of ethylene glycol: A combined infrared and theoretical conformational sampling investigation.

The hydrogen-bond rearrangements involved in the self-association and microhydration of the simplest vicinal diol, ethylene glycol (EG), have been explored by low-temperature mid- and far-IR cluster spectroscopy in doped neon "quantum" matrices at 4 K complemented by high-level quantum chemical conformational sampling. In addition to the reproduction of previous mid-IR jet assignments of the highly concerted hydrogen-bonded O-H stretching transitions, new distinct far-IR observations have been unambiguously attributed to transitions associated with concerted and highly anharmonic large-amplitude hindered OH (OD) torsional motion of (EG)2 and (EG-d2)2, respectively. These observations confirm the formation of a highly S4 symmetric global intermolecular potential energy minimum in the cryogenic neon environment associated with a very compact intermolecular hydrogen-bonded cyclic structure.

Stepwise microsolvation of HCl revisited: Infrared investigation of selectively deuterated (HCl)m(H2O)n (m + n ≤ 4) cluster molecules.

In a recent theoretical investigation of DCl-H2O, HCl-D2O, and DCl-D2O [Felker et al., J. Phys.

Spectroscopic and Quantum Chemical Evidence of Amine-CO and Alcohol-CO Interactions: Confirming an Intriguing Affinity of CO to Monoethanolamine (MEA).

A recent broadband rotational spectroscopic investigation of the cross-association mechanisms of CO with monoethanolamine (MEA) in molecular beams [F. Xie et al., , , , e202218539] revealed an intriguing affinity of CO to the hydroxy group.

Self-aggregation and microhydration mechanisms of monoethanolamine: Far-infrared identification of large-amplitude hydrogen bond libration.

The strong tendency for self-aggregation together with an intriguing mechanism for the microhydration of monoethanolamine (MEA) have been explored by low-temperature far-infrared cluster spectroscopy in doped neon "quantum" matrices at 4 K complemented by high-level quantum chemical modeling. In addition to the assignment of new mid-infrared perturbed intramolecular transitions, a distinct far-infrared transition is unambiguously assigned to the concerted large-amplitude hydrogen bond librational motion of the MEA homodimer. This observation confirms a global "head-to-head" intermolecular potential energy minimum associated with the formation of a compact doubly intermolecular OH⋯N hydrogen-bonded cyclic structure, where both monomeric intramolecular OH⋯N hydrogen bonds are broken upon complexation.