Covalently linked donor-acceptor cyclometalated platinum(II) complexes. Structure and luminescent properties

Synthesis, characterization and electrophosphorescent properties of mononuclear platinum(II) complexes based on 2-phenylbenzoimidazole derivatives

“…Che's group exploited the (C^N^N) cyclometalated ligands that show a strong preference for a planar geometry, and can therefore be expected to disfavor the excitedstate distortion and promote radiative decay [38]. These platinum (II) complexes obtained have high phosphorescence quantum yields ranging from 0.21 to 0.68 in solutions at room temperature [37,39]. Secondly, restraining the formation of the aggregates and excimers [40] of the square planar molecular configuration of platinum(II) complexes.…”

Electronic structures and optical properties of neutral substituted fluorene-based cyclometalated platinum(II)–acetylide complexes: A DFT exploration

“…[42]. Recently, they also developed tridentate cyclometalated Pt(II) lumophores with C^N^N ligand (HC^N^N = 6-aryl-2,2 0 -bipyridine) [33,[54][55][56][57][58]. Compared to N^N^N (or tpy, 2,2 0 ,6 0 ,2 00 -terpyridine) and C^N^C (HC^N^CH = 2,6-diphenylpyridine) congeners [59][60][61][62], two advantages of the C^N^N ligand have emerged: the strongly r-donating carbanion would increase the energy difference between the ligand field and the MLCT states with superior emissive properties, and associating with the anionic alkynyl ligand affords neutrality to the cyclometalated Pt(II) r-alkynyl moiety framework.…”

Modular Cyclometalated Platinum(II) Complexes as Luminescent Molecular Sensors for pH and Hydrophobic Binding Regions

“…Hence, changes in photophysical behaviour have been observed in the presence of biomolecules, [1±5] gases and organic vapours. [6,7] In this context, cyclometalated Pt II complexes of 6-phenyl-2,2'-bipyridine and related ligands are important because they display emissive MLCT excited states in solution, [8][9][10][11][12] and these emissions are extremely environment-sensitive. [13] Meanwhile, the design of fluorescent chemosensors based on photoinduced electron transfer (PET) suppression is an area of continued interest in supramolecular chemistry.…”