Some lanthanide and group II complexes with triketones

Ismail, M.; Lyle, Samuel J.; Newbery, J. E.

doi:10.1016/0022-1902(69)90024-4

Cited by 9 publications

(9 citation statements)

References 3 publications

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“…[33] Given the considerably detailed investigation on lanthanoid b-diketonate complexes to date, [34] it was surprising that the b-triketonate analogues were rather unexplored.O nly ac ouple of reports in the 1960s describe the emissive properties of lanthanoid b-triketonate complexes, without any structurals tudies. [35][36][37] Remarkably,t he [Yb(K·HOEt)(L) 4 ] 2 assembly provedt ob eah ighly efficient NIR emitter when comparedw ith the photophysical performance of NIR-emitting lanthanoid b-diketonate complexes. Furthermore, we were able to demonstrate that the photophysicalp roperties of such an assembly can be exploited in the emitting layer of organic light-emitting diodes (OLEDs) fabricated by sublimation.…”

Section: Introductionmentioning

confidence: 99%

“…Given the considerably detailed investigation on lanthanoid β‐diketonate complexes to date,34 it was surprising that the β‐triketonate analogues were rather unexplored. Only a couple of reports in the 1960s describe the emissive properties of lanthanoid β‐triketonate complexes, without any structural studies 35–37. Remarkably, the [Yb(K ⋅ HOEt)( L ) 4 ] 2 assembly proved to be a highly efficient NIR emitter when compared with the photophysical performance of NIR‐emitting lanthanoid β‐diketonate complexes.…”

Section: Introductionmentioning

confidence: 99%

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Lanthanoid/Alkali Metal β‐Triketonate Assemblies: A Robust Platform for Efficient NIR Emitters

Reid

Stagni

Malicka³

et al. 2015

Chemistry A European J

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The reaction of hydrated lanthanoid chlorides with tribenzoylmethane and an alkali metal hydroxide consistently resulted in the crystallization of neutral tetranuclear assemblies with the general formula [Ln(Ae⋅HOEt)(L)4 ]2 (Ln=Eu(3+) , Er(3+) , Yb(3+) ; Ae=Na(+) , K(+) , Rb(+) ). Analysis of the crystal structures of these species revealed a coordination geometry that varied from a slightly distorted square antiprism to a slightly distorted triangular dodecahedron, with the specific geometrical shape being dependent on the degree of lattice solvation and identity of the alkali metal. The near-infrared (NIR)-emitting assemblies of Yb(3+) and Er(3+) showed remarkably efficient emission, characterized by significantly longer excited-state lifetimes (τobs ≈37-47 μs for Yb(3+) and τobs ≈4-6 μs for Er(3+) ) when compared with the broader family of lanthanoid β-diketonate species, even in the case of perfluorination of the ligands. The Eu(3+) assemblies show bright red emission and a luminescence performance (τobs ≈0.5 ms, ${{\Phi}{{{\rm L}\hfill \atop {\rm Ln}\hfill}}}$≈35-37 %, ηsens ≈68-70 %) more akin to the β-diketonate species. The results highlight that the β-triketonate ligand offers a tunable and facile system for the preparation of efficient NIR emitters without the need for more complicated perfluorination or deuteration synthetic strategies.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Lanthanoid/Alkali Metal β‐Triketonate Assemblies: A Robust Platform for Efficient NIR Emitters

Reid

Stagni

Malicka³

et al. 2015

Chemistry A European J

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“…The decrease may be due to passivating of the surface with chlorine atoms, as with the fluorine-containing precursor Ce(tpm)3, or perhaps the sulfur atoms form volatile compounds with chlorine, which evaporate during the growth. The main reflection in XRD was (111) for the pure SrS. With Sic& dopant, the main reflection in XRD was (220) at 300°C and (ZOO) at higher temperatures.…”

Section: Effect Of Doping and Codoping On Thin Film Growthmentioning

confidence: 96%

Volatile Metal β‐Diketonates: ALE and CVD precursors for electroluminescent device thin films

Karinen

Niinistou²

1997

Chemical Vapor Deposition

140

113

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The use of volatile P-diketonate chelates as precursors for the deposition of thin films for electroluminescent devices is reviewed. Alternating current thin film electroluminescent (ACTFEL) devices consist of an emitting layer sandwiched between two dielectric layers, together with conducting and buffer layers. Besides various physical deposition techniques, the commonly applied methods for preparing thin films are chemical vapor deposition (CVD) and its particular variant atomic layer epitaxy (ALE). Alkaline earth P-diketonates are used as precursors for deposition of the semiconducting alkaline earth sulfide and thiogallate films that provide the matrix in emissive layers, while P-diketonates of lanthanides and a few other metals (Mn, Na, K) are precursors for dopants and codopants producing colors. P-Diketonate precursors can also be used for the preparation of dielectric alkaline earth titanate and oxide layers. Current research on thin film electroluminescent materials is focused on improving the blue color produced by cerium doping of alkaline earth sulfide and thiogallate matrices. The synthesis and properties of P-diketonate chelates and the growth and characterization of the thin films obtained with them are presented and discussed. This review of precursors for TFEL materials is also relevant for other materials, including oxide superconductors.

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“…Cyclic 1,3,3 H -triketones have attracted some interest because of their application as herbicides, since it has been shown that their derivatives inhibit p-hydroxyphenylpyruvate dioxygenase (Lee et al, 1998, and references therein). 1,3,3 H -Triketones have also been studied as chelating ligands with group 2 and lanthanide cations (Ismail et al, 1969). Although the crystal structures of many -substituted -diketones are known, only one crystal structure of an acyclic 1,3,3 H -triketone [Cambridge Structural Database (CSD;Allen, 2002) refcode OCIQOG (Lim et al, 2001)] and one transition metal complex with an acyclical 1,3,3 H -triketonate ligand (CSD refcode IGAGUS;Carano et al, 2002) have been reported to date.…”

Section: Commentmentioning

confidence: 99%

Conformational enantiomeric disorder in tripivaloylmethane

Kaitner

Stilinović

2007

Acta Crystallogr C

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Tripivaloylmethane [systematic name: 4-(2,2-dimethylpropanoyl)-2,2,6,6-tetramethylheptane-3,5-dione], C(16)H(28)O(3), is a 1,3,3'-triketone with C(3) molecular symmetry, prepared by alpha-acylation of 2,2,6,6-tetramethylheptane-3,5-dione with 2,2-dimethylpropanoyl anhydride in the presence of barium metal. The molecules are conformationally chiral and pack so that each molecular site is occupied with equal probability by the two enantiomers. The carbonyl groups of the two superimposed enantiomeric molecules are at an angle of 75.4 (16) degrees .

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Some lanthanide and group II complexes with triketones

Cited by 9 publications

References 3 publications

Lanthanoid/Alkali Metal β‐Triketonate Assemblies: A Robust Platform for Efficient NIR Emitters

Lanthanoid/Alkali Metal β‐Triketonate Assemblies: A Robust Platform for Efficient NIR Emitters

Volatile Metal β‐Diketonates: ALE and CVD precursors for electroluminescent device thin films

Conformational enantiomeric disorder in tripivaloylmethane

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