Ligand and Solvent Effects on Emission Lifetimes of Cr(III) Ammines.

Walters, R.T.; Adamson, Arthur W.; Johansson, Georg; Holm, Arne; Toubro, Nils H.; Krantz, A.; Laureni, J.

doi:10.3891/acta.chem.scand.33a-0053

Cited by 46 publications

(24 citation statements)

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“…At the low temperature limit, phosphorescence and nonradiative deactivation are responsible for excited state relaxation. Since phosphorescence quantum yields, P , are small for most Cr(III) complexes [79], the 2 E g lifetime must be dominated by NR (k nr k r ). Because the 2 E g and 4 A 2g electronic states are nested, i.e.…”

Section: Photophysicsmentioning

confidence: 99%

Metal centered ligand field excited states: Their roles in the design and performance of transition metal based photochemical molecular devices

Wagenknecht¹,

Ford²

2011

Coordination Chemistry Reviews

282

292

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Section: Photophysicsmentioning

confidence: 99%

Metal centered ligand field excited states: Their roles in the design and performance of transition metal based photochemical molecular devices

Wagenknecht¹,

Ford²

2011

Coordination Chemistry Reviews

282

292

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“…QYs of 0.0001 and 0.0015 were found for [1]Cl and [4]Cl, respectively, measured in solution at room temperature. These QYs correspond well to the in solution value of 1 × 10 -4 determined for the relatively strong emitter [Cr(en) 3 ] 3+ , [38] though lower than the QY value of [Cr(en) 3 ] 3+ measured in frozen glass at 77 K (0.0090). [39,42] The homoleptic cyano complex, [Cr(CN) 6 ] 3-, displays a QY of 0.0042 in frozen glass.…”

Section: Emission Studiesmentioning

confidence: 99%

Synthesis and Investigation of Macrocyclic Cr^III Bis(alkynyl) Complexes: Structural and Spectroscopic Properties

et al. 2017

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The synthesis and characterization of four new CrIII–bis(alkynyl) complexes bearing the macrocyclic tetraaza ligand DMC (DMC = 5,12‐dimethyl‐1,4,8,11‐tetraazacyclotetradecane) are reported. Complexes trans‐[Cr(DMC)(C2R)2]X (R = Ph ([1]X), Fc ([2]X), X = Cl, ClO4. C2H ([3]X′); X′ = ClO4, BPh4) and cis‐[Cr(DMC)(C4TMS)2]Cl ([4]Cl) were studied using UV/Vis and FTIR spectroscopy, and their identities were verified with ESI‐MS and elemental analysis. The three trans complexes, [1]Cl, [2](ClO4), and [3](BPh4), were structurally characterized using single‐crystal X‐ray diffraction, which revealed a pseudo‐octahedral geometry around the Cr center with the nitrogen atoms occupying the equatorial plane and the alkynyl ligands residing in the apical positions. Spectroscopic analysis of [1]Cl, [3](BPh4) and [4]Cl shows highly structured d–d bands between 320 and 500 nm. All CrIII complexes reported herein are emissive, and detailed studies were performed for [1]Cl, [3](BPh4), and [4]Cl, yielding phosphorescence lifetimes (77 K) of 380, 358, and 160 µs, respectively, and room temperature quantum yields of 0.01 % for complex [1]Cl and 0.15 % for complex [4]Cl. Voltammetric studies of complex [2](ClO4) indicate a weak but discernible coupling between two ferrocenyl groups across the C2–Cr–C2 bridge.

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“…First , the temperature and solvent dependence studies on R ion (33) have been extended to other Cr(III) complexes ( 37). The principal data are summarized in Table 1; apparent • activ~'tion energies for the r ' S , not included , range from 4 to 12 kcal mole~ and obey the previously noted Barclay-Butler plot (33).…”

Section: Resultsmentioning

confidence: 99%

Whither Inorganic Photochemistry? A Parochial View

Adamson¹

1979

Photochemistry–7

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Ligand and Solvent Effects on Emission Lifetimes of Cr(III) Ammines.

Cited by 46 publications

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Metal centered ligand field excited states: Their roles in the design and performance of transition metal based photochemical molecular devices

Metal centered ligand field excited states: Their roles in the design and performance of transition metal based photochemical molecular devices

Synthesis and Investigation of Macrocyclic Cr^III Bis(alkynyl) Complexes: Structural and Spectroscopic Properties

Whither Inorganic Photochemistry? A Parochial View

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Ligand and Solvent Effects on Emission Lifetimes of Cr(III) Ammines.

Cited by 46 publications

References 0 publications

Metal centered ligand field excited states: Their roles in the design and performance of transition metal based photochemical molecular devices

Metal centered ligand field excited states: Their roles in the design and performance of transition metal based photochemical molecular devices

Synthesis and Investigation of Macrocyclic CrIII Bis(alkynyl) Complexes: Structural and Spectroscopic Properties

Whither Inorganic Photochemistry? A Parochial View

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Synthesis and Investigation of Macrocyclic Cr^III Bis(alkynyl) Complexes: Structural and Spectroscopic Properties