Acid-base interactions: introduction

The significance in contemporary adhesion theory of Lewis acid-base interactions has been discussed in Acid-base interactions introduction. It was argued that in many... 

Some methods of evaluating the acid-base components have been discussed under Acid-base interactions introduction and Inverse gas chromatography. Here, the method introduced by Good, Chaudhury and van Oss, which involves acid-base surface... 

Acid-base interactions introduction D E PACKHAM Relation to work of adhesion, Drago equation... 

In the main introduction to this chapter the importance of acid-base interactions in determining the interfacial chemistry between fillers and matrices in particulate composites was emphasised. In this section, a summary of the more commonly used acid-base theories will be presented. 

Though the Russian school has been credited with the introduction of the EDL electronic adhesion theory,O07) the idea of donor-acceptor (or acid-base) interaction did not originate from their school. 

After this brief introduction, the chapter will focus on solvolysis reactions and acid-base equilibria of various platinum compounds and on species distribution of isomeric [PtCl2(NH3)2] in aqueous solution in Section 2. Binding of platinum compounds to monomeric nucleobase derivatives will be discussed in Section 3, while Section 4 pays attention to the reactions of Pt-nucleobase complexes with different nucleophiles. And finally, the interactions of Pt with DNA and defined oligonucleotides will be discussed in Section 5. 

Zeolitic materials have been widely used in the last decades in the chemical and petrochemical industries. This increasing interest on these materials is based in their unique properties a uniform intra-crystalline microporosity that provides aceess to a large and well-defined surface, the molecular sieve effect, and the electrostatic field centered at zeolite cations. Furthermore, some properties of zeolites can be tailored by changing the nature of the compensating cation located in the inner part of the cavities by means of their ion-exchange capability. In this way, the pore accessibility of some zeolites used in gas separation processes, as well as the adsorbent-adsorbate interactions, can be tailored by the introduction of cations with different size and chemical nature. Similarly, different cations can be used to introduce new chemical properties (acid-base, redox, etc.), which are needed for a given application in catalytic processes. 

The influence of electronic effects on the binding mode of tetraalkynylplatinate anions is apparent in the reactions of compounds of general formula Li2[Pt (C=CR)4] with thallium(l) nitrate [72]. For electrrai-rich alkynyl moieties (R = p-tolyl, 1-naphtyl), discrete hexanuclear structures are obtained (Scheme 16, top), in which each Tl center interacts with four C=C triple bonds and not with the platinum atom. The introduction of a remote electron-withdrawing substituent oti the alkynyl unit (R = p-CFsC lU) induces a dramatic change in the structure of the Lewis acid-base complex each platinum atom now involves in donor-acceptor bonds with two thaUium(I) ions (Pt-Tl 2.9355(5) and 3.0272(5) A), one oti each face of its coordination plane. These Tl2Pt units are interconnected by weak interactions of thallium with the Jt-elecfron density of the triple bonds. 

The introduction of a carefully located tertiary amine proximal to the boron centre of a fluorescent sensor permits the sensor to function at lower pH and introduces an off on optical response to the system via photoinduced electron transfer (PET). The tertiary amine boronic acid (N-B) interaction in a boronic acid-based PET sensor has strength in the range of 15 25 kJ mol . In an aprotic solvent, the N B dative bond is usually present. However, in a protic media, solvent insertion of the N-B occurs to afford a hydrogen-bonded zwitterionic species. 

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