Features of spectral properties of Sm3+ complexes with dithia- and diselenophosphinate ligands

Vibrational Quenching in Near‐Infrared Emitting Lanthanide Complexes: A Quantitative Experimental Study and Novel Insights

“…However, to achieve a full picture of the performances of the Ln emitters in such complexes it is also necessary to take into account their individual oscillator strength in the different coordination environments. The “natural” radiative lifetime τ rad , that is, the lifetime the emitter would have in the absence of any quenching phenomenon, is a parameter that strictly depends on the chemical surroundings (symmetry, degree of orbital mixing, vibrational coupling, ligand charge transfer states…) of the Ln ion . It has been already discussed how the change in the coordination sphere on going from water to tppo containing complexes induces a modification of the spectral shapes of emission and absorption peaks pointing out the necessity to assess τ rad for each individual molecular species.…”

“…The "natural"r adiative lifetime t rad , that is, the lifetime the emitterw ould have in the absence of any quenching phenomenon, is ap arameter that strictly depends on the chemical surroundings( symmetry,d egree of orbital mixing, vibrational coupling, ligand charget ransfer states…) of the Ln ion. [26] It has been already discussed how the change in the coordination sphereo ng oing from water to tppo containing complexes induces amodification of the spectral shapes of emission and absorption peaks pointing out the necessity to assess t rad for each individual molecular species. It is knownt hat the determination of this parameter can be a rather difficult task requiring rather tedious calculations that can be subjected to large errors.…”

Synthesis and luminescence of some rare earth metal complexes

“…Brought to you by | MIT Libraries Authenticated Download Date | 5/12/18 8:54 PM In order to discover novel lanthanide optoelectronic materials, a set of chalcogenides and sulfide-nitrides of Nd (21), Sm (19,20) and Dy (22) were synthesized [12,13] (Scheme 3). The complexes of Sm and Dy revealed luminescence activity.…”

“…Aspiring to fill this gap, we synthesized some scandium derivatives and studied their photoluminescent (PL) and electroluminescent (EL) properties. To design the compounds of Sc and other rare earth metals well-known 8-hydroxyquinoline H(q), 2-amino-8-hydroxyquinoline H(q NH2 ) [3,4], 2-mercaptobenzothiazole H(mbt) [5], 2-(2-pyridyl)phenol H(pp) [6], 2-(2-benzimidazol-2-yl)phenol H(NON), 2-(2-benzoxyazol-2-yl)phenol (HOON), 2-(2-benzothiazol-2-yl)phenol H(SON) [7], pentafluorophenol (C 6 F 5 OH) [8], fluorinated iso-propanol (HOCH(CF 3 ) 2 ), tert-butanol (HOC(CF 3 ) 3 ) and 2,3-butanediol (HO(CF 3 ) 2 C-C(CF 3 ) 2 OH) [9]) and new (1-(2-pyridyl)naphth-2-ol H(pn) [6], 3-(5-methylbenzoxazol-2-yl)naphthol H(OON 5Me ), 3-(6-methylbenzoxazol-2-yl)naphthol H(OON 6Me ) [10], 3-(2-benzoxazol-2-yl)-2-naphthol H(NpOON), 3-(2-benzothiazol-2-yl)-2-naphthol H(NpSON) [11]) alcohols as well as potassium salts K(S 2 PPh 2 ) and K(Se 2 PPh 2 ) [12]) were synthesized. Quite unusual complexes of Nd and Dy were synthesized by direct reactions of lanthanide meals, iodine, nitrogen and sulfur [13].…”

The Evaluation of F-F Spectra of Some ER (Iii) Ternary Complexes Containing Crown Ethers and Amino Acids & Computation of Spectral Parameters Using the Spectra

“…The f-f transition spectra have been recorded in solution. The spectra have been evaluated & analyzed and spectral parameters, energy interaction parameters: such as Racah (E k ), Slator-Condon (F k ), Landé ( 4f ), electric dipole intensity parameters in terms of Judd-Ofelt (T 2 , T 4 & T 6 ) &Oscillator strength (P osc ) and the bonding parameters: Nephelauxetic ratio (β) & co-valency ( b 1/2 )have been computed to explain the symmetry, ligand environment around the Er (III) ion, nature of Er (III)-ligand bonding using these spectra [8] II. EXPERIMENTAL A.…”