Chelating nitrogen ligands

The dimethylplatinum(II) complexes having chelate nitrogen ligands, [PtMe2(N-N)] (N-N = 2,2 -bipyridyl or 1,10-phenanthroline) (46) reacted with alcohols (ROH, R = Me, Et, Pr) to give hygroscopic and basic platinum(IV) complexes. 

Complexes with chelating nitrogen ligands incorporating oximes and related functions 292... 

The reactions of a benzylzinc chloride TMEDA adduct with either benzyllithium or benzyl(trimethylsilyl)lithium TMEDA adduct yielded both homoleptic dibenzylzinc (37, Figure 16) and heteroleptic monobenzylzinc compounds as TMEDA adducts. The heteroleptic diorganozinc compounds do not disproportionate as long as TMEDA is present, but removal of the chelating nitrogen ligand in the gas phase does cause disproportionation. 

Chelate nitrogen ligands (h) Ethylenediamine-type ligands... 

There are a number of dinuclear carboxylate complexes of Co" which show interesting magnetic behavior and contain the [Co2(ft-OH2)(RC02)2]2+ or [Co2(/t-X)(/i-RC02)2]+ core (X = OH, Cl, Br), stabilized by chelating nitrogen ligands to complete the octahedral coordination. The latter can be oxidized to mixed-valence ConCom compounds in which the valences are localized.5... 

Several Co complexes with chelating nitrogen ligands catalyze oxidation reactions, e.g. [CoII(bipy)2]2+ activates 02 and oxidizes N-methyl-anilines, benzyl alcohols, and aldehydes. In the absence of organic substrates 02 is reduced to H202.M Cobalt(II) complexes of tetraaza macrocyclic ligands (N4) reversibly form 02 adducts [(N4)CoOO]2+ which are rapidly reduced to [(N4)CoOOH]2+ these species are involved in the electro-reduction of 02 to H202.23... 

Tetracoordinate Boron. A number of tetracoordmate organoboron species that are photo- and electroluminescent, and thus of interest for device applications have been developed. Characteristic of complexes (168-170) is the presence of chelating nitrogen ligands such as 8-hydroxyquinoline in (168). The qumolate complexes (168) were reported to show superior stabihfy over more commonly used aluminum complexes. Moreover, their photophysical properties were shown to be tunable through ligand variation. ... 

Chelate nitrogen ligands (h) Ethylenediamine-type ligands Cu(en)3l(S04) (178) CuN TO 427... 

The catalytic activity and selectivity of two systems has been compared one based on Rii3(CO)i2 in the presence of [NEt4][Cl] as a cocatalyst, which is very good for the conversion of nitrobenzene derivatives to carbamates [22, 23], and the other based on Pd(02CR)2 in the presence of chelating nitrogen ligands and 2,4,6-trimethylbenzoic acid (TMBH), which is very active and selective for the conversion of nitrobenzene to phenylisocyanate [37] and carbamates [93, 94]. 

Table 18. Carbonylation of o-nitrobenzyl alcohol (55) catalysed by Pd(02CR)2/chelating nitrogen ligand (L)/2,4,6-trimethylbenzoic acid (TMBH). (Data from [92]).

CHC(NH)CF3). The carbonyl ligands can be substituted by several phosphines." The use of novel chelating nitrogen ligands of the bis(azaheteroaryl)methane type afforded complexes such as Rh(BBOM)(CO)2 18... 

---