Hydrogen bonds, acid-base interactions

Althongh attempts were made by means of spectroscopic methods to understand the natnre of the interactions between VOCs and phthalocyanines [32,59], the sensing mechanism is not yet well nnderstood. The interactions between phthalocya-nines/porphyrins and the VOCs may be associated with bond formation, acid-base interactions, hydrogen bonding, dipolar, and multipolar interactions, n-n molecular... 

The adhesion of paint films is influenced primarily by the chemical composition of the binder. Films may adhere by a mix of all possible mechanisms, for example. Dispersion forces, Acid-base interactions. Hydrogen bonding, covalent bond formation and other specific chemical interactions, such as chelation. In addition to these molecular interactions across an interface, the micro-roughness of the substrate can contribute by increasing the surface area and points of contact (see Mechanical theory of adhesion). In addition, if the substrate is itself another paint film (or a plastic), chain ends of the overcoating polymer can diffuse into the substrate, provided that the binder types are mutually compatible (see Theories of adhesion). 

Many synthetic polymers are essentially nonpolar and do not participate in specific interactions like acid-base reactions, hydrogen-bonding, or dipole-dipole interactions. In that case, intermolecular interactions arc of the van der Waals type... 

A similar situation is seen in type III solutions. The vapour pressure is lower than the predicted value according to Raoult s law and the interaction could be similar to acid-base or hydrogen bond formation. 

Phase selectivity, which also impacts resolution in a chromatographic separation, is governed by solute-stationary-phase interactions, such as dispersion, dipole, acid/base, and hydrogen bond donors/acceptors. A column containing a polar stationary phase can display greater retention for a solute having a given... 

Langlet, J., Claverie, P., Caron, R, Boeuve, J. C. (1981). Interactions between nucleic acid bases in hydrogen bonded and stacked configurations The role of the molecular charge distribution. International Journal of Quantum Chemistry, 20, 299. 

For polymer systems in which strong interactions, such as acid-base or hydrogen bond interactions, are present, either LCST or UCST behavior may be described using the directional-specific model of segmental interactions [17,18] ... 

Until surface contact, the force between molecules is always one of attraction, although this attraction has different origins in different systems. London forces, dipole-dipole attractions, acid-base interactions, and hydrogen bonds are some of the types of attraction we have in mind. In the foregoing list, London forces are universal and also the weakest of the attractions listed. The interactions increase in strength and also in specificity in the order listed. 

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