Hydrogen bonding theories

Of particular interest is the fact that two plasticisers of similar molecular weight and solubility parameter can, when blended with polymers, lead to compounds of greatly differing properties. Many explanations have been offered of which the most widely quoted are the polar theory and the hydrogen bonding theory. 

Later on, believing in the hydrogen-bonding theory, Gibson and coworkers incorporated aliphatic crown ethers 27, 28, 29, and 30 into a wide variety of backbones polyurethane, polyester and polyamides [68, 107-113],... 

G. Gilli, P. Gilli, Towards an unified hydrogen-bond theory. J. Mol. Struct. 552, 1-15 (2000)... 

G. Hofacker, Y. Marechal, and M. Ratner, in P. Schuster,G. Zundel and C. Sandorfy (eds.), The hydrogen Bond Theory, North-Hohand Publishing. Amsterdam, the Netherlands 1976 p. 297. 

D. Hadi and S. Bratos, in P.Schuster, G. Zundel, and C. Sandorfy (eds.), The Hydrogen Bond Theory, North-Holland Publishing, Amsterdam The Netherlands, 1976 p. 567. 

Huggins ML (1971) 50 Years of hydrogen bond theory. Angew Chem Int Ed Engl 10 147-152... 

The modern concepts of protein structure and of the H bond had their genesis about the same time, and have advanced together. Hydrogen bond theory began to flourish soon after Latimer and Rodebush presented their classical paper (1201), and x-ray diffraction methods were applied to proteins about the same time. Twenty years later, IR spectroscopy studies were begun. In this chapter we shall show the crucial role of the H bond in modern proposals for protein structures, but the treatment will be restricted to those phases of protein study which reveal this role. (Of course, such restriction dictates only passing mention of... 

Gilli, P., Bertolasi, V., Pretto, L., Antonov, L., and Gilli, G., Variable-temperature X-ray crystallographic and DFT computational study of the N-H- -O/N- H-O tautomeric competition in l-(arylazo)-2-naphthols. Outline of a transition-state hydrogen bond theory, J. Am. Chem. Soc., Ill, 4943-4953 (2005). 

The principal interest of the acid salts describedin this review is that many of them, those of Type A, contain some of the shortest known hydrogen bonds between oxygen atoms. A tentative discussion of these short bonds within the framework of hydrogen bond theory may be permissible. To facilitate such discussion, the backgroimd wiU be sketched. Detailed, and more authoritative, accounts will be found elsewhere (87, 88, 89). 

At present, there are no generally accepted views on the formation of hard agglomerates of nanoparticles. There are several representative theories proposed, e.g., including crystal bridge theory, capillary pressure theory, hydrogen bond theory, chemical bond theory, etc. [21]. We shall only mention the essential concept of each theory. 

Hydrogen bond theory Nanoparticles become attached as a result of hydrogeu boud effects, and thus form agglomerates. 

G. Gilli and P. Gilli, The Nature of the Hydrogen Bond Outline of a Comprehensive Hydrogen Bond Theory, Oxford University Press, Oxford, 2009. 

Many refinements can be introduced into the theory. First of all, it would be worthwhile to pay further attention to the structure of water around the polar groups. Perhaps, when the hydrophobic bond (and the role of water in it) is better understood, it may be possible to modify the hydrogen-bonding theory to take the water into account. Second, the helices need not be held rigidly with respect to each other, i.e., side-chain hydrogen bond rupture may lead to increased mobility of the backbone chains, allowing the R groups to move quite a distance away from each other. Third,... 

---