Conventional hydrogen bond concept

At the beginning of the 20th century, Huggins [1], Latimer and Rodebush [2], and Pauling [3] introduced the concept of a classical or conventional hydrogen bond A-H- -B as that formed between a (conventional) hydrogen... 

In this chapter we will mainly concentrate on hydrogen-bonded ferroelectrics, which were the first class of ferroelectrics where the coexistence of the different dynamics was postulated and observed [26,27]. In Chap. 2 of this volume (by Dalai et al. [51]) new experimental techniques and their advantages over conventional ones will be described together with their applications to hydrogen-bonded systems. The theoretical concept of bihnear... 

In fact, as noticed by Hobza and Havlas [105], the published definitions of the H- bond are not unambiguous and many exist . Nowadays, the concept of a hydrogen bond is much broader than it was expected nearly a century ago [80,82], and that is why it permits, together with the conventional H-bonds, an existence of a wide class of those, say nonconventional ones, identified during the last three decades experimentally and theoretically, which do not partially... 

In 1923, Brpnsted extended the concept of an acid as a species that produces hydrogen ions, to put forward a broader definition of an acid as a proton donor. A base, by analogy, was a proton acceptor (see also Hydrogen bonding). The reaction of a conventional acid with water becomes an acid-base reaction ... 

One possible alternative to the complex modular scheme has been proposed by Meyer and co-workers, and is based upon the integration of excitation, electron, and proton transfer in one single concerted step. Instead of conventional PCET, where light excitation precedes a proton and electron transfer event, the authors propose a mechanism based on photo-EPT. This as a concept has been tested for intramolecular charge transfer in hydrogen bonded dyes, but further development is needed before it can be applied to light driven water splitting devices. 

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