Heterocyclic donors

Copper(I) halide supramolecular networks linked by N-heterocyclic donor bridging ligands 98PAC2351. 

The length of the conjugating bridge between the terminating heterocyclic donor moieties... 

VOF2 combines readily with water or fluoride. It has less tendency to combine with nitrogen or sulfur, but many complexes of these donors and oxygen donors were easily prepared by reaction (22).428 The products containing N-heterocyclic donors are listed in Table 11, with some properties. 

The binding of CO to hemocyanin is of interest. The two-coordinate copper centres in deoxyhemocyanin might each be expected to bind CO. However, some two-coordinate complexes of Cu1 with heterocyclic donor ligands show lack of reactivity towards CO in the absence of additional ligands, probably because the metal does not receive enough electron density to back bond to CO.1295... 

Franck and Marzabadi755 have developed the heterocyclic donor 180 and used it in coupling with a variety of alcohol acceptors to obtain /8-glycosides in good yields with excellent stereoselectivities using equimolar amount of triflic acid [Eq. (5.286)]. 

Many publications are devoted to the synthesis of nitrile complexes, carried out by the immediate (direct) interaction of RCN and MX , mostly in the absence of a solvent [10, p. 95]. A series of N-donors, N-containing heterocyclic donors, whose complexes frequently model biologically important objects (Sec. 2.2.42), should be mentioned apart. The following compounds belong to this type azoles 188, azines 189, and their amino derivatives 572. Their interaction with metal salts takes place usually without a solvent with the use of liquid heterocyclic ligands, for example pyridine [10, ch. 4, p. 107 11], in alcohol or alcohol-aqueous mediums in cases of crystalline ligands (3.10)—(3.12). The specific conditions are presented in the literature, cited in Sec. 2.2.4.2. 

Selected -Barriers in Push-Pull Ethylenes with Heterocyclic Donors and Acceptors... 

Monocyclic azines are very weak --donors and behave mainly as n-donors on interaction with electrophiles. However, 7r-donor character is significantly increased in their benzo derivatives which have higher energy HOMOs (Table 2). For example, acridine 25 forms a highly colored 1 1 molecular complex with 2,3,5,6-tetrachloro-l,4-benzoquinone (chlor-anil). Perimidine 96 is one of the strongest heterocyclic --donors and gives deeply colored molecular complexes with a variety of organic electron acceptors. This is consistent with its electron-rich structure and its separate classification. 

Figure 10 Didentate chelates containing N-heterocyclic donors...

Multidentate Macrocyclic Ligands HETEROCYCLES DONOR ATOMS FUNCTIONAL GROUPS... 

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