2E relaxation in aquoammine chromium(III) complexes

Forster, Leslie S.; Rund, John V.; Castelli, Francesco; Adams, Patricia L.

doi:10.1021/j100210a029

Cited by 18 publications

(5 citation statements)

References 5 publications

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“…16 The blue-shifts of absorption and emission maxima by electron-donating groups such as amino groups are explained by the "energy-gap law". [19][20][21][22] Fivemembered heterocyclic ligands such as imidazole, pyrazole and triazole have the greater tunability of the p-electronic structure and the synthetic versatility of luminescent metal complexes. Multiple coordination sites, however, may enable these azole ligands to form complicated multinuclear complexes with or without the electronic interaction between metal ions.…”

Section: Introductionmentioning

confidence: 99%

Syntheses, structural characterization and photophysical properties of 4-(2-pyridyl)-1,2,3-triazole rhenium(i) complexes

et al. 2008

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Novel chelators, i.e., 4-(2-pyridyl)-1,2,3-triazole derivatives, were synthesized by means of Cu(I)-catalyzed 1,3-dipolar cycloaddition and used to prepare luminescent Re(I) complexes [ReCl(CO)(3)(Bn-pyta)], [ReCl(CO)(3)(AcGlc-pyta)] and [ReCl(CO)(3)(Glc-pyta)] (Bn-pyta = 1-benzyl-4-(2-pyridyl)-1,2,3-triazole, AcGlc-pyta = 2-(4-(2-pyridyl)-1,2,3-triazol-1-yl)ethyl 2,3,4,6-tetra-O-acetyl-beta-d-glucopyranoside, Glc-pyta = 2-(4-(2-pyridyl)-1,2,3-triazol-1-yl)ethyl beta-d-glucopyranoside). X-Ray crystallography of Bn-pyta and Glc-pyta indicated an azocompound-like structure while the 1,2,4-triazole isomer has an azine character. [ReCl(CO)(3)(Bn-pyta)] crystallized in the monoclinic system with space group P2(1)/n. Bn-pyta ligand coordinates with the nitrogen atoms of the 2-pyridyl group and the 3-position of 1,2,3-triazole ring, which is a very similar coordinating fashion to that of the 2,2'-bipyridine derivative. The glucoconjugated Re(I) complexes [ReCl(CO)(3)(AcGlc-pyta)] and [ReCl(CO)(3)(Glc-pyta)] hardly crystallized, and were analyzed by applying extended X-ray absorption fine structure (EXAFS) analysis. The EXAFS analyses suggested that the glucoconjugation at the 1-position of the 1,2,3-triazole makes no influence to the coordinating fashion of 4-(2-pyridyl)-1,2,3-triazole. [ReCl(CO)(3)(Bn-pyta)] showed a blue-shifted maximum absorption (333 nm, 3.97 x 10(3) M(-1) cm(-1)) compared with [ReCl(CO)(3)(bpy)] (371 nm, 3.35 x 10(3) M(-1) cm(-1)). These absorptions were clearly assigned to be the mixed metal-ligand-to-ligand charge transfer (MLLCT) on the basis of time-dependent density functional theory calculation. The luminescence spectrum of [ReCl(CO)(3)(Bn-pyta)] also showed this blue-shifted feature when compared with that of [ReCl(CO)(3)(bpy)]. The luminescence lifetime of [ReCl(CO)(3)(Bn-pyta)] was determined to be 8.90 mus in 2-methyltetrahydrofuran at 77 K, which is longer than that of [ReCl(CO)(3)(bpy)] (3.17 micros). The blue-shifted electronic absorption and elongated luminescence lifetime of [ReCl(CO)(3)(Bn-pyta)] suggested that 4-(2-pyridyl)-1,2,3-triazole functions as an electron-rich bidentate chelator.

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Section: Introductionmentioning

confidence: 99%

Syntheses, structural characterization and photophysical properties of 4-(2-pyridyl)-1,2,3-triazole rhenium(i) complexes

et al. 2008

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“…For example, intrinsic conduction of aromatic hydrocarbons is about 10 À16 H10 À15 cm À1 om À1 and unsaturated hydrocarbons about 10 À20 H10 À19 cm À1 om À1 . According to the theory of Forster [82], intrinsic conductivity consists of two processes: electronic conductivity and conductivity, caused by excited molecules. Free electron jumps from one molecule to another one and linger on every molecule for a certain time.…”

Section: Introductionmentioning

confidence: 99%

Interparticle interactions in concentrate water–oil emulsions

Mishchuk

Sanfeld²,

Steinchen³

2004

Advances in Colloid and Interface Science

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“…The solution was filtered and solvent removed by rotary evaporation; then the residue was extracted with CH2C12 and the solution filtered and evaporated. The resulting solid (5), purple crystals from ethanol; Co(0-S-0)(py)2 (6), purple crystals from ethanol containing ~1% pyridine; Co(0-S-0)(bpy) (7), green crystals from dichloromethane; Ni(O-S-O) (TMED) (8), olive green crystals from ethanol; Ni(0-S-0)(py)2 (9) olive green crystals from benzene/ hexane; Cu(Ó-S-0)(TMED) (10), blue crystals from ethanol; Cu(0-S-0)(py)2 (11), blue crystals from ethanol containing ~1% pyridine; Cu(0-S-0)(bpy) (12), blue crystals from dichloromethane/hexane.…”

Section: Methodsmentioning

confidence: 99%

Coordination modes of polydentate ligands. 3. Five-coordinate complexes of cobalt(2+), copper(2+), and nickel(2+) containing a tridentate thioether-alkoxy ligand

Boeré¹,

Brown²,

Stephan³

et al. 1985

Inorg. Chem.

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A study has been made of the application of the dianion of the fluorinated alcohol-thioether 2,2'-[thiobis(methylene)]bis-[ 1,1,1,3,3,3-hexafluoro-2-propanol], [HOC(CF3)2CH2]2S, as a tridentate, dinegative, ligand. Stable, neutral, complexes are formed with Coz+, Ni2+, and Cu2+ from nitrogen-containing coligands, and five-wordination is favored. A complete structural determination has been carried out on the complex Co[OC(CF )2CH2]2S(C5H~N)2. The crystals are monoclinic, space group C2/c, with a = 26.24 (1) A, b = 16.565 (9) A, c = 10.998 (6) A, 0 = 104.50 (4)O, and 2 = 8. The Co2+ ion is five-coordinate in trigonal-bipyramidal geometry, with the alkoxy-thioether ligand adopting a facial configuration, the sulfur atom being in the apical position. These complexes show no tendency to increase the coordination number of the metal to 6 by solvation, an effect attributed to the bulk of the fluorinated alkoxy groups.

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2E relaxation in aquoammine chromium(III) complexes

Cited by 18 publications

References 5 publications

Syntheses, structural characterization and photophysical properties of 4-(2-pyridyl)-1,2,3-triazole rhenium(i) complexes

Syntheses, structural characterization and photophysical properties of 4-(2-pyridyl)-1,2,3-triazole rhenium(i) complexes

Interparticle interactions in concentrate water–oil emulsions

Coordination modes of polydentate ligands. 3. Five-coordinate complexes of cobalt(2+), copper(2+), and nickel(2+) containing a tridentate thioether-alkoxy ligand

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