Di-2,2/-pyridylamine

Amine complexes stabilized with phosphine ligands of the type [AuL(PR3)]+ have been obtained for L = bipy,2310 phen,2310,231 quinoline,23 1 acridine,2311 benzo[h]quinoline,2311 naphthyr-idine (388)2311 2,2 -biquinoline,2311 di-2-pyridyl-ketone,2311 di-2-pyridylamine,2311 2-(2-pyridyl)-benzimidazole, 2311 ferrocenylpyridine, 2-nitroaniline,2312 4-methoxyaniline,2312 NHPh2, 2 NHEt2,2312 NMe3,2312 quinuclidine,2313 NEt3,2314 2-aminothiazoline,2315 histidine,2316... 

The enhancement of the acidity of the amine is not limited to sites which are directly co-ordinated to the metal, but may also be transmitted for considerable distances through the molecule. For example, the complex bis(di-2-pyridylamine)palladium(ii) undergoes a facile deprotonation (Fig. 5-28). This reaction also serves to exemplify the importance of charge control over the level of protonation. The deprotonation yields the neutral doubly deprotonated complex. 

Figure 5-28. The deprotonation of a co-ordinated di-2-pyridylamine ligand, in which the site of deprotonation is not directly bonded to the metal.

Dichloro(diethylene)platinum(II), cis and trans forms( ), formation of, from tetrachloro(di-ethylene)diplatinum(II), 5 215 Dichloro (di-2-pyridylamine)cobalt-(II), 5 184... 

In Volume V of this series, syntheses were presented for coordination compounds of 2,2 -iminodipyridine [di-2-pyridylamine, NH(C6H4N)2] with copper(II) and cobalt-(II). Nickel(II) has also been shown to coordinate with this ligand. A similar behavior is exhibited by zinc salts, which form 1 1 derivatives if a 1 1 mol ratio of reactants is used. The specific choice of a solvent medium for synthesis is dictated by the solubility of the zinc compound. Either acetone or methanol may be used with zinc chloride, methanol with zinc acetate, and pyridine with zinc cyanide. 

See also Preparation of metal derivatives of 1,3-diketones, synthesis 29 Dichloro(di-2-pyridylamine)cobalt(II), synthesis 50... 

DICHLORO (DI-2-PYRID YLAMINE)COPPER (II) AND BIS(DI-2-PYRIDYLAMINE)COPPER(II) CHLORIDE... 

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