Complexes luminescence

Other methods involve isotopic dilution, kinetic resolution, relaxation rates of diastereomeric complexes, luminescence. ... 

Arias, J., Bardaji, M. and Espinet, P. (2008) Luminescence and Mesogenic Properties in Crown-Ether-Isocyanide or Carbene Gold(I) Complexes Luminescence in Solution, in the Solid, in the Mesophase, and in the Isotropic Liquid State. Inorganic Chemistry, 47, 3559-3567. 

The synthesis of [Ircp Cl(bpy-cd)]Cl, where bpy-cd is a /3-cyclo-dextrin attached at the 6 position to a bpy ligand, is detailed.138 The complexes [Ircp (diimine)X]+, X = C1, H, diimine = bpy, phen, are active catalysts for the light-driven water-gas-shift reaction.139 The hydride complexes luminesce at 77 K and room temperature, whereas the chloride complexes do not.140 The three-legged piano-stool arrangement of the ligands in [Ircp (bpy)Cl]+ and [Ircp (4,4 -COOFl-bpy)Cl]+ is confirmed by X-ray crystallography.141,142 Further mechanistic studies on the catalytic cycle shown in reaction Scheme 11 indicate that Cl- is substituted by CO and the rate-determining step involves loss of C02 and H+ to leave the Ir1 species, which readily binds Fl+ to yield the lrIH hydride species.143... 

Recently, Gianotti et al. (96) reported photoluminescence and DRUV spectra of pure siliceous MCM-41 and Ti-MCM-41 containing Ti4+ species anchored to the inner walls of the siliceous MCM-41. They observed complex luminescence signals and concluded that these could be used for a clear distinction of the emission of tetrahedral Ti4+ ions from those of silica surface centers. 

X -Ray powder pattern studies of the complexes [M(phen)2X2]" and [M(bipy)2YZ]"+ [M = Co, Rh, Ir, or Os X = Cl, H2O, or ox YZ = CI2 or (0H)(H20)] show that each metal in each series is isomorphous. A cis configuration is therefore assigned to all complexes. Luminescence quantum yields have been measured for a series of [IrCl2(N—N)2C1 complexes (N—N = phen or bipy, or diphenyl derivatives), permitting a quantitative estimate of the effect of ligand phenyl substituents.A normal-co-ordinate analysis (i.r. has been carried out for [Ir(NH3)5Cl]Cl2. ... 

The versatility of the quinolyl derivative (295) is exemplified in the complex [Ru(295-A,A )(295-A,A, A")C1]. The coordination behavior of (295) has been compared with those of (296) and (297) and factors influencing didentate vs. tridentate preferences have been examined. Perchlorate salts of [Ru(tpy)L)] " and [RUL2] where L = (298)-(300) have been synthesized and characterized, and their properties compared with those of [Ru(tpy)2] ". Complexation of Ru with 2,6-bis(4 -phenyl-2 -quinolyl)pyridine (L) affords [RUL2] , spectrosccmic properties of which have been discussed. " The bis(7 -methyl)-derivative of this ligand, L, has also been prepared and incorporated into the complexes [M(L )2f, [ (L CIs] (M = Ru, Os), and [Ru(L )(tppz)] + where tppz = 2,3,5,6-tetra(2 -pyridyl)pyrazine. Related cyclometallated complexes have also been studied. All the complexes luminesce at 77 K and [M(L )2] (M = Ru or Os), [Ru(L )(L )] , and two of the cyclometallated species are luminescent at room... 

As far as I know, no other examples of cobalt(III) complex luminescence have been reported. Several d6 systems, notably the chelates of... 

Ruthenium(II) bipyridyl and Cr(III) aquo complexes luminesce strongly when photostimulated. The emission of light can be quenched effectively by such species as oxygen, paraquat, Fe(II) aquo complexes, Ru(II) complexes and Cr(NCS)i (Sutin [15]). Pfeil [16] found that the quenching rate coefficients are typically a third to a half of the value which might be predicted from the Smoluchowski theory [3]. 

The results obtained from thermal spin equilibria indicate that AS = 1 transitions are adiabatic. The rates, therefore, depend on the coordination sphere reorganization energy, or the Franck-Condon factors. Radiationless deactivation processes are exothermic. Consequently, they can proceed more rapidly than thermally activated spin-equilibria reactions, that is, in less than nanoseconds in solution at room temperature. Evidence for this includes the observation that few transition metal complexes luminesce under these conditions. Other evidence is the very success of the photoperturbation method for studying thermal spin equilibria intersystem crossing to the ground state of the other spin isomer must be more rapid than the spin equilibrium relaxation in order for the spin equilibrium to be perturbed. 

Table 2 Transition metal polypyridyl complexes luminescence probes for PSP ...

Fig. 9 Energy level diagram indicating redox control of Os(II) complex luminescence [51]...

Webber et al. have used [Os(bpy)3]2+ complex luminescence in a photoluminescence following electron transfer scheme for HPLC detection of amines... 

This dinuclear complex luminesces at both 77 K and room temperature in solid state and emission seems to be related to the fragment AuI-PPh2C=C rather than to aurophilic interactions, which are commonly responsible for the luminescent properties of dinuclear species. 

Finally, it is worth mentioning that both complexes luminesce in the solid state both at room temperature and at 77 K, showing different luminescent behavior, the dioxane derivative being one of the still scarce blue luminescent materials. In contrast, the acetone complex is also luminescent in solution and shows a solvent dependence on the emission. Luminescence and conductivity measurements suggest that the Tl- -Tl interaction also exists in solution (probably stabilized by solvent molecules) and TD-DFT calculations seem to indicate that this interaction is responsible for luminescence in this case. This contrasts with other pentahalophenyl Au/Tl complexes, in which the optical properties are associated with the Au- -Tl contacts.149,151-154... 

Mixed-ligand square-planar platinum(II) complexes of the type [Pt(L) (L Xmnt)] (15), where L = L = P(OPh)3, P(OEt)3, PPh3 L + L =l,5-cyclooctadiene (cod), l,2-bis(diphenylphosphino)methane (dppm) have also been investigated for their photoluminescent properties (59, 90, 91). These complexes luminesce in the solid state at 298 K and at 77 K in frozen solvent... 

Components of fluidized cracking catalysts (FCC), such as an aluminosilicate gel and a rare-earth (RE) exchanged zeolite Y, have been contaminated with vanadyl naphthenate and the V thus deposited passivated with organotin complexes. Luminescence, electron paramagnetic resonance (EPR) and Mossbauer spectroscopy have been used to monitor V-support interactions. Luminescence results have indicated that the naphthenate decomposes during calcination in air with generation of (V 0)+i ions. After steam-aging, V Og and REVO- formation occurred. In the presence of Sn, Tormation Of vanadium-tin oxide species enhance the zeolite stability in the presence of V-contaminants. 

Squarate Complexes of Heavier Transition Metals and Lanthanides The Squarate Ion as a Linking Group Spectroscopy of Squarate Complexes Luminescence Studies Electrochemistry... 

Steemers, F.J., Verboom, W, Reinhoudt, D.N., et al (1995) New sensitizer-modified calix[4]arenes enabling near-UV excitation of complexed luminescent lanthanide ions. Journal of the American Chemical Society, 117, 9408-9414. 

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