Ester-substituted cyclometallated rhodium and iridium coordination assemblies with π-bonded dioxolene ligand: synthesis, structures and luminescent properties

Abstract

A series of functionalized cyclometallated rhodium and iridium coordination assemblies2–7displaying a π-bonded dioxolene ligand is described.

Deep‐Red Phosphorescent Iridium(III) Complexes with Chromophoric N‐Heterocyclic Carbene Ligands: Design, Photophysical Properties, and DFT Calculations

“…[1][2][3][4][5][6][7] These materials are of paramount interest in optoelectronics [8,9] (e.g., organic light-emitting diodes [10,11] and light-emitting electrochemical cells) [12][13][14][15] and are extensively used as photosensitizers, [16,17] imaging agents, [18,19] and photocatalysts. [1][2][3][4][5][6][7] These materials are of paramount interest in optoelectronics [8,9] (e.g., organic light-emitting diodes [10,11] and light-emitting electrochemical cells) [12][13][14][15] and are extensively used as photosensitizers, [16,17] imaging agents, [18,19] and photocatalysts.…”

Cyclometalated Rhodium and Iridium Complexes Containing Masked Catecholates: Synthesis, Structure, Electrochemistry, and Luminescence Properties

“…The average Ir−N and Ir−C bond distances are 2.03(1) and 1.99(1) Å, respectively, in line with the results obtained for similar compounds. 21,[23][24][25]30 The six-membered carbocycle ring is bound to the Cp*Ru fragment in a η 6 mode; the mean Ru−C bond distance is 2.22(3) Å for the internal diene system (C25 and C28) and 2.40(6) Å for C23 and C24, slightly longer but also indicative of a bonding interaction. Moreover, the mean C−O bond length is 1.31(2) Å, in accord with a single bond.…”

“…The iridium complex [(F2ppy) 2 Ir(η-Cat)] (3) exhibits rather a broad emission band at λ max = 475 nm with ϕ = 4.3 × 10 −3 and τ = 38.75 ns, which might originate from 3 LC-3 MCLT transitions (Figure 7). 46 For comparison purposes with respect to the previous work on related [(MEppy) 2 M(η-Cat)] (ME = methylester; M = Rh, Ir) 30 but containing an ester group at the pyridyl unit instead of the phenyl ring, we studied the luminescence properties of both compounds 2 and 3 in a MeOH/EtOH (1/4) mixture at room temperature and at 77 K. Unlike the iridium ester compound, which emits in the red region (λ max = 600 nm), our current compounds displayed emissions at higher energy (vide infra). It should be mentioned that the rhodium ester compound is not emissive.…”

Rational Design of Mono- and Bi-Nuclear Cyclometalated Ir(III) Complexes Containing Di-Pyridylamine Motifs: Synthesis, Structure, and Luminescent Properties

“…For instance, [Ir(ppy) 3 ] is a well-representative molecule for such compounds and behaves as a green emitter for organic light-emitting devices with high efficiency as reported by Thompson and coworkers [13]. The introduction of a bipyridine (bpy)-type ligand (NˆN) to the metal center generates cationic heteroleptic complexes of the type [Ir(CˆN) 2 (NˆN)] + [14][15][16]. Such compounds have been utilized as light-emitting-electrochemical cells (LECs) [17,18].…”