Phenanthroline chelates

Figure 232. Copper(I)-templated synthesis of Cu(I)-complexed [2]-rotaxane 96 whose thread contains a terpyridine and a phenanthroline chelate.

Figure 25. Pictorial representation of the reaction sequence initiated by the excitation of the rotax-ane Cu.20 into either porphyrin subunit. The thick lines represent phenanthroline chelates, and the black disk, Cu. The empty and hatched diamonds are the Zn and Au porphyrins, respectively.

Phenanthroline chelates, reactions with nucleophiles 83MI3. Phosphorylated benzannelated pyridines 86KGS1587. 

Figure 34. The structure of QAFGIO [Ho(C5H604)(phen)Cl], where l,10-phenanthroline = phen.l,10-Phenanthroline chelates Ho—O dimers that are then connected through glutarate groups to form chains along [100]. The large phenanthroline groups also participate in n stacking.

The 2,9-diphenyl-l,10-phenanthroline chelates embedded respectively in the macrocyclic and the dumbbell-shaped components of (Cu)-[3]rotaxane... 

Figure SO. A covalent bis-porphyrin dimer bridged by a 2,9-diphenyl-1,10- phenanthroline chelate (90) and the dimer (91) of its Zn(ll)/ Au(lll) complex formed by coordination to a Cu" center.

Linear dimers of perpendicularly arranged porphyrins can also be assembled at a tetrahedral metal center such as Zn(II) or Cu(I), using ditopic, phenanthroline chelates, as shown by Crossley and coworkers. The case of Cu(l) (92), is shown in Figure 51. The phenanthroline ligands are connected to the tetrapyrrolic macrocycles via fused aromatic rings, producing ribbon-like molecules. 

Molecular motion based on the electrochemical-induced ligand substitution reaction has been reported in a copper(I) rotaxane (Figure 37). This rotaxane is composed of a 2,9-diphenyl-l,10-phenanthroline-containing cyclic poly ether ring, a tetraphenylmethane-stoppered molecular string that contains another 2,9-disubstitnted phenanthroline chelate... 

The more recent results on the interaction of these substitution inert complexes with DNA (see Chapter 1), and especially the photosensitized cleavage of DNA by Co(III) complexes [46], may well be relevant to these biological results, especially as a 1,10-phenanthroline chelate, cis-[Co(phen)2(N02)2], is also claimed to be an efficient sensitizer. Differing activities have been observed in isomeric forms of [Co(NH3)4X2], X = Cl, NO2. Abrams et al. [40] have observed that all active complexes show a reduction potential of < 260 mV, which represents a cut-off point as there is no strict correspondence between reduction potential and OER. No selectivity is apparent for these complexes in hypoxic cells. The hexam-mine and pentammine complexes originally reported [36] are essentially... 

---