Trisbipyridine ligand

The beautiful circular tetra- 454 [24], penta- 455 [25] and hexa-nuclear 456 [24] helical structures are built of the ligands each of which coordinates with three metal ions. Interestingly, the self-assembly of trisbipyridine ligand 457 to afford the penta- or hexanuclear complex is governed by the counterion. Namely,... 

The same group has also shown that mono- or dinuclear trisbipyridine-like complexes containing the ligand 2,2 -bis(l-methyl-benzimidazol-2-yl)-4,4 -bipyridine instead of unsubstituted 2,2 -bipyridine catalyze the reduction of C02 to oxalate (C2042-) in anhydrous MeCN at — 1.65 V and —1.55 V, respectively (vs. Ag AgCl) with a good current yield (r/ 70%). In contrast,... 

This class of ligands mostly consists of derivatives of pyridine, 2.2 -bipyridinc. 2,2, 2"-ter-pyridine, and 1,10-phenanthroline. Scheme 6 shows the structures of fourEu3+ chelates with aromatic amine derived ligands, that can be covalently bound to proteins, for time-resolved fluorometry, among which 4,7-bis(chlorosulfophenyl)-l,10-phenanthroline-2,9-dicarboxylic acid (BCPDA)-Eu3+ and trisbipyridine cryptate (TBP)-Eu3+ are widely used for europium fluorescence labels in TR-FIA. 

Functionalization of the bipyridine ligand (enlarging the conjugation) proved an excellent tool for working toward ruthenium(II)trisbipyridine complexes with substantially enhanced nonlinearities [147]. Although the initially reported hyperpolarizabilities, obtained by HRS, were overestimated due to luminescence contributions, the fluorescence-free hyperpolarizabilities ((800-1000) x 10 esu) are still impressive [127, 148]. 

Sohna, J.E.S. Fages, F. A trisbipyridine tripodal ligand as toluene gelator. Phase transition-triggered binding of iron(ll). Chem. Comniun. 1997. 327-328. 

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