Trialkylamine metal complexes

The base can be a co-solvent, such as trialkylamine, or the Lewis base function can be designed into the metal complex using O-bearing ligands such as al-koxyamines, acetylacetonates, etc. The optimum amount of co-solvent is 1-2 equivalents of the metal complex present in the solvent. The nitrogen atoms in ethylenediamine are not sufficiently basic to activate the surface protons from silica, but ethylenediamine complexes of some metal cations, such as Cu(II), readily exchange for the protons in zeolites which are more acidic than silanol protons. ... 

In place of the commonly used metal halides as the metal precursors, transition metal complexes with labile leaving groups have also been used for the preparations of metal alkynyls (Scheme 10.8). The presence of good leaving groups, for example, N2, MeCN or H2O ligands, would provide potential sites for ligand substitutions. These kinds of reactions are usually carried out in the presence of sodium hydroxide or trialkylamine which act as a base to deprotonate the terminal alkynes. 

Water-emulsifiable vehicles contain emulsifiers that may act as plasticizers after film formation, affecting the hardness. Water-soluble vehicles usually contain a neutralizing amine, the primary purpose of which is to solubihze the resin. These amines can influence the drying properties as they tend to complex the metal drier, thus affecting the catalytic activity. Acceptable results are usually obtained with trialkylamines such as dim ethyl eth a n o1 amine, trimethyl amine, and aminomethylpropan o1 (7). 

Coordination chemistry is the study of coordination compounds or, as they are often defined, coordination complexes. These entities are distinguished by the involvement, in terms of simple bonding concepts, of one or more coordinate (or dative) covalent bonds, which differ from the traditional covalent bond mainly in the way that we envisage they are formed. Although we are most likely to meet coordination complexes as compounds featuring a metal ion or set of metal ions at their core (and indeed this is where we will overwhelmingly meet examples herein), this is not strictly a requirement, as metalloids may also form such compounds. One of the simplest examples of formation of a coordination compound comes from a now venerable observation - when BF3 gas is passed into a liquid trialkylamine, the two react exothermally to generate a solid which contains... 

It is to be noted that alkoxides of more electropositive metals - alkaline, alkaline earth, rare earth (RE), and Zr(IV), Hf(IV), and Sn(IV) - often form quite stable complexes with protic ligands, which are also Lewis bases (alcohok, amines). Their formation is supported by both complexation of the metal atom with this additional Lewis base function, which is apparently weaker than the alkoxide one, and formation of the hydrogen bonds with active hydrogen atoms of the additional ligands [61]. No stable complexes are formed with stronger but aprotic nucleophiles such as trialkylamines, R3N [62]. Very often, the alcohol solvates have a bit lower solubility, but are easily purified by recrystallization, which makes them attractive as commercial products. When the pure alkoxides are highly... 

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