Cationic
Heteroleptic Cyclometalated IridiumIII Complexes Containing
Phenyl-Triazole and Triazole-Pyridine Clicked Ligands
Marco Felici, Pablo
Contreras-Carballada, Jan M. M. Smits, Roeland J. M. Nolte, René
M. Williams, Luisa De Cola and Martin C. Feiters
Molecules 2010, 15(3), 2039-2059;
doi:10.3390/molecules15032039
Abstract:
Novel heteroleptic iridium complexes
containing the 1-substituted-4-phenyl-1H-1,2,3-triazole (phtl)
cyclometalating ligand have been synthesized. The 3+2 Huisgen dipolar
cycloaddition method (‘click’ chemistry) was utilized to prepare a
class of bidentate ligands (phtl) bearing different substituents on the
triazole moiety. By using various ligands (phtl-R1 and pytl-R2)
(R1=adamantane, methyl and R2=adamantane, methyl, β-cyclodextrin,
ursodeoxycholic acid), we prepared a small library of new luminescent
ionic iridium complexes [Ir(phtr-R1)2(pytl-R2)]Cl and report on their
photophysical properties. The flexibility of the clicking approach
allows a straightforward control on the chemical-physical properties of
the complexes by varying the nature of the substituent on the ligand.