Flexible covalent tripods in nonadentate podands: synthesis of tris[3-(6-diethylcarbamoylpyridine-2-carboxamido)propyl]amine and its complexing properties with trivalent lanthanides was written by Renaud, Fabien;Decurnex, Carole;Piguet, Claude;Hopfgartner, Gerard. And the article was included in Journal of the Chemical Society, Dalton Transactions in 2001.Electric Literature of C9H12N4 This article mentions the following:
The nonadentate podand tris[3-(6-diethylcarbamoylpyridine-2-carboxamido)propyl]amine (L14) is prepared according to a multistep strategy using the flexible tris(3-(N-methylamino)propyl)amine (Me-TRPN) covalent tripod. L14 exists as a statistical mixture of four conformers in solution whose distribution is slightly affected by protonation of the apical nitrogen atom in [L14 + H]+. Reactions of L14 and [L14 + H]+ with Ln3+ (Ln = La-Lu) produce flexible and poorly stable 1:1 podates [Ln(L14)]3+ and [Ln(L14 + H)]4+ in which the terdentate chelating binding units exhibit partial dynamic on-off complexation equilibrium In the experiment, the researchers used many compounds, for example, 3,3′,3”-Nitrilotripropanenitrile (cas: 7528-78-1Electric Literature of C9H12N4).
3,3′,3”-Nitrilotripropanenitrile (cas: 7528-78-1) belongs to nitriles. Nitriles are polar, as indicated by high dipole moments. As liquids, they have high relative permittivities, often in the 30s. Industrially, the main methods for producing nitriles are ammoxidation and hydrocyanation. Both routes are green in the sense that they do not generate stoichiometric amounts of salts.Electric Literature of C9H12N4
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts