Luminescent Pt^II Complexes of Tridentate Cyclometalating 2,5‐Bis(aryl)‐pyridine Ligands

Cyclometallated tridentate platinum(ii) arylacetylide complexes: old wine in new bottles

“…For example, complexes 3a-c (Chart 2) bearing a pentafluorophenylacetylide ligand showed a quantum yield (F = 0.08-0.99) which is substantially better than the chloro (F = 0.03-0.25), DMSO and N,N-dimethylimidazolium-bearing counterparts. 23 It was proposed that exchanging a C^-donor (phenyl group by a naphthyl unit) assists in stabilizing the geometrical distortion of the excited state leading to enhanced k r values. Interestingly, auxiliary group dependent emitting excited states were suggested for these complexes.…”

Anionic Cyclometallated platinum(II) Tetrazolato Complexes as Viable Photoredox Catalysts

“…[27][28][29][30] The fourth site of the coordination sphere is occupied by the S atom of the DMSO ligand, with a S-Pt distance of 2.195(3) Å, which is consistent with previously reported complexes of analogous structure. 28,29,31 The S atom adopts a pseudo tetrahedral geometry with the S=O bond oriented on the plane of the square planar coordination of the platinum center, with the two methyl groups lying above and below the plane. The crystal packing shows the presence of relatively short interactions between neighbouring cyclometallating ligands (C•••H distance = 2.843 -2.892 Å), whereas the shortest Pt•••Pt distance observed is 6.016 Å, indicating the absence of metal-metal interactions in the solid state.…”

“…The crystal packing shows the presence of relatively short interactions between neighbouring cyclometallating ligands (C•••H distance = 2.843 -2.892 Å), whereas the shortest Pt•••Pt distance observed is 6.016 Å, indicating the absence of metal-metal interactions in the solid state. 30,31 The complexes are arranged in pairs and in a head-to-tail fashion along the a axis (see ESI Symmetry transformations used to generate equivalent atoms: 1…”

“…With reference to related platinum(II) cyclometalated complexes, the high energy bands (λ < 400 nm) are assigned to π®π* ligand-centered transitions (LC). [27][28][29][30][31][32] On the other hand, the bands at lower energy (λ > 400 nm) are assigned to spin-allowed (singlet to singlet) and spin-forbidden (singlet to triplet) metal-to-ligandcharge-transfer transitions (MLCT). 28,30,32,33 While none of the complexes display photoluminescence in DMF fluid solution at room temperature, the emission properties could be measured from solid state and frozen matrix at 77 K. The combined emission data are summarized in Table 3.…”

Spectroelectrochemical Sensing: Current Trends and Challenges

“…From this point of view, SEC is a really powerful analytical technique. SEC can be used with many different purposes, and excellent examples can be found in literature in different fields such as organic molecules , molecules of biological interest , inorganic complexes , conducting polymers , carbon nanotubes , graphene , fullerenes , metal nanoparticles , quantum dots , etc. A huge variety of information can be obtained using SEC, for example, formal potentials , electron transfer rate constants , diffusion coefficients , number of electrons , molar absorption coefficients , band‐gaps , among many others.…”