Luminescent excimers and exciplexes of PtII compounds

PtII Complexes with 6‐(5‐Trifluoromethyl‐Pyrazol‐3‐yl)‐2,2′‐Bipyridine Terdentate Chelating Ligands: Synthesis, Characterization, and Luminescent Properties

“…Knowing there exists a higher tendency for forming multiple Pt···Pt interactions in the condensed phase, it is thus reasonable to ascribe the F 2 band to originate from either metalmetal-to-ligand charge transfer (MMLCT) [7] or excimeric ligand-to-ligand charge transfer emission. [8] Further evidence is given by the emission spectrum of 1 recorded using a single-crystal sample (see the Experimental Section). Complex 1 exhibits a well-aligned head-to-tail stacking along the b axis of crystal lattices, with intermolecular Pt···Pt distances as short as 3.385 (as mentioned previously).…”

“…These transitions are often denoted as either metal-metal-to-ligand charge transfer (MMLCT) [7] or excimeric ligand-to-ligand charge transfer emission. [8] Among the chelating ligands documented in the literature, 2,2'-bipyridine (Figure 1) is the most popular neutral ligand, and it can interact with a metal atom using simple dative bonding involving N-donor atoms. On the other hand, 2phenylpyridine is known for its capability of undergoing a cyclometalation reaction, by supplying the anionic bonding character with respect to the central metal atom.…”

A Review of Luminescent Anionic Nano System: d10 Metallocyanide Excimers and Exciplexes in Alkali Halide Hosts

“…For inorganic excimers, a matrix isolation study has been carried out for alkali metals, alkaline earth metals and group VIIB metals with absorption and luminescence spectra [ 12 ]. Platinum complexes have been reported to form different excimers in aqueous solution, such as [PtII(4,7-diphenyl-1,10-phenanthroline)(CN) 2 ], [Pt 2 (P 2 O 5 H 2 ) 4 2− Tl], and [Pt 2 (P 2 O 5 H 2 ) 4 2− Au(CN) 2 − ] [ 13 , 14 , 15 ]. In aqueous solution, the formation of excimers is affected by the concentration of monomers; as the concentration increases, the emission peak intensity corresponding to the excimer is enhanced.…”

Substituent effect on photo- and electroluminescence properties of heteroleptic cyclometalated platinum(II) complexes based on a 2-(dibenzo[b,d]furan-4-yl)pyridine ligand

“…Among them, heteroleptic cyclometalated platinum(II) complexes have been eagerly studied along with heteroleptic bis-and homoleptic tris-cyclometalated iridium(III) complexes, and have often been employed as emitting dopants for PLEDs [21,22]. In general, the platinum(II) complexes adopt four-coordinated planar structures and often form excimers owing to strong intermolecular stacking interaction [10,[23][24][25]. The excimer-based luminescence affords a broad emission band at longer wavelength together with the original monomer emission.…”