Polydentate nitrogen donors

Polydentate nitrogen donor tripod ligands are discussed in this section. Mixed donor ligands containing nitrogen donors are discussed in Section 6.8.11. 

The equilibrium constants, obtained by NMR spectroscopic methods, showed a strong dependence on both the macrocycles and the diorganozinc compounds. Polydentate nitrogen donor ligands, particularly triazacyclononanes, form much stronger complexes than cryptands and crown ethers. 

Complexes with Other Polydentate Nitrogen Donor Ligands... 

High spin/low spin equilibria Pressure effects on the distribution of electronic states have also been investigated for d iron] 11) complexes of the type FeL, where L is a polydentate nitrogen donor Ugand. For certain L such as pyim (Fig. 6.8), the... 

There are, of course, numerous complexes in which polydentate ligands with both oxygen and nitrogen donor atoms are present, generally giving high coordination numbers.13 The ligand diethylenetriaminepentaacetic acid forms La3+ and Eu3+ complexes with a coordination number of ll.14... 

Polydentate and Related Nitrogen Donor Con lexes.—[Bis(2-dimethylaminoethyl)-methylamine]Cd(NCS)2 contains five co-ordinate cadmium in a square-pyramidal environment the apical position is occupied by N-bonded thiocyanate (Cd—N = 2.18 A) while the basal positions are occupied by the amine (Cd—N = 2.34—2.37 A) and the second thiocyanate (Cd—N = 2.21 A) ligands. ... 

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