Synthesis, luminescence, and excited-state complexes of the tris(1,10-phenanthroline)- and bis(terpyridine)iridium(III) cations

Synthesis, Characterization, and DFT Investigation of IrIII Tolylterpyridine Complexes

“…The electronic absorption spectra for 1, 2, and 5 are shown in Figure 3, and the spectroscopic data for the complexes 1-6 and the tterpy and terpy ligands are tabulated in Table 2. [22] While the shapes of the spectra are similar, the absorption band at 282 nm for 2 is red shifted relative to that at 272 nm for 1 (Figure 3), owing to the two phenyl groups attached to complex 2. The absorption band at 272 nm in 1 has been assigned as a phen(π)- [a] Ref.…”

Luminescent Iridium(III)‐Terpyridine Complexes – Interplay of Ligand Centred and Charge Transfer States

“…Luminescence data in aerated and air-free MeCN at 298 K and in BuCN at 77 K are collected in Table 2. The room temperature reaction rate constants with oxygen (O 2 solubility in air equilibrated MeCN is 1.9 × 10 -3 m [18] ) can be derived from the lifetime data shown in Table 2 [ 19] We noticed that complexes 2 and 3 exhibit spectroscopic features, both in the low-energy regions of the absorption spectra and in the luminescence spectra at room temperature, which suggest an electronic nature other than neat LC for the excited states involved in the concerned transitions. Thus, the absorption profile for these complexes, see Figure 1, is characterised by a broad, unstructured band extending beyond 400 nm with ε max of the order of Figure 3.…”

Charge Separation in a Molecular Triad Consisting of an Iridium(III) – bis-terpy Central Core and Porphyrins as Terminal Electron Donor and Acceptor Groups

“…[6] Recently, we reported an efficient synthetic procedure for making related complexes, including asymmetrical compounds containing two different terpy ligands. [7] A detailed electrochemical, spectroscopic, and photochemical study clearly showed that 1) [Ir(terpy) 2 ] 3 is a potentially interesting electron relay (Ir III /Ir II : E 0 %À 0.7 V vs. SCE in CH 3 CN; ªIr II º is in fact an iridium(iii)-stabilized radical anion localized on the terpy ligand), 2) no low-lying excited states (`2.5 eV) are present, and 3) the excited state populated by light absorption (mostly of ligand-centered character) is photochemically very promising, especially for complexes of 4'-substituted terpy: it is long lived (b 1 ms at 298 K in CH 3 CN), strongly luminescent, and expected to display a very strong electron-accepting character.…”