Photosensitized Luminescence of Neodymium(III) Coordinated with 8-Quinolinolates in DMSO-<i>d</i>6

Iwamuro, Mitsunori; Adachi, Takayuki; Wada, Yuji; Kitamura, Takayuki; Nakashima, Nobuaki; Yanagida, Shozo

doi:10.1246/bcsj.73.1359

Cited by 41 publications

(20 citation statements)

References 40 publications

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“…Fluorescence quenching of the coordinating unit is mainly related to two processes: population of the triplet state of the ligand favoured by the external heavy‐atom effect exerted by the lanthanide cation, and depletion of the ligand excited state through energy transfer to the metal ion. As previously demonstrated on similar complexes22 and as commonly accepted for organic antennae,3c, 20 it seems reasonable to assume that the ligand‐to‐metal energy transfer occurs from the lowest triplet excited state of the ligand acting as an antenna.…”

Section: Resultssupporting

confidence: 54%

“…The measured NIR luminescence quantum yields (0.11×10 −3 and 0.12×10 −3 in aerated and degassed THF, respectively) are lower than those published for other 8‐hydroxyquinoline derivatives 11. 22, 23 Most likely, in ligand 1 , the substitution on the hydroxyquinoline ring by a phenylamide moiety is responsible for non‐radiative pathways through its free rotation in solution. Furthermore, the N–H as well as C–H vibrations should also contribute to the quenching of the emission 20.…”

Section: Resultsmentioning

confidence: 68%

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Metal‐Oxide Nanoparticles with Desired Morphology Inherited from Coordination‐Polymer Precursors

Zhao

Sun

et al. 2012

Chemistry A European J

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Efficient and designable strategies for fabrication of nanomaterials with controlled morphology are fundamentally important to nanotechnology development. A number of studies have shown that the morphology of nanomaterials, especially for semiconductors, determines the optical-electronic properties, band gap, photoenergy conversion efficiency, photocatalytic activities, and so forth.[1] Accordingly, various strategies based on physical and chemical methods have been developed in recent years for the fabrication of different kinds of nanomaterials. Chemical methods, such as solgel processes, micelles, chemical precipitation, hydrothermal synthesis, pyrolysis, and vapor deposition, have been frequently employed in the large-scale preparation of nanostructured materials. [2] Many nanostructured materials with uniform morphology and specific crystal planes have been successfully synthesized in recent years. For example, TiO 2 crystals with a high percentage of exposed {001} facets could be obtained with the aid of fluorine-containing compounds.[3] Hexagonal, platelike, ZnO nanocrystals with polar {001} facets were synthesized by changing the molar ratio of the reactants. [4] BiVO 4 nanoplates with the preferred (010) surface orientation have been prepared both in aqueous ethanolamine solution or in the presence of a directing agent.[5] Co 3 O 4 nanorods synthesized in an ethylene glycol solution predominantly exposed {110} planes.[6] Despite the versatile methods reported, fabrication of nanostructured materials with desirable morphology and composition still remains a big challenge and great interest in the field of material science.Herein, we report the fabrication of metal oxides with controlled morphology and crystal planes by using coordination-polymer nanoparticles (CPNs) as precursors based a on template-engaged-quasi-topotactic transformation by an "escape-by-crafty-scheme" strategy and the CPNs with designed morphology can be synthesized based on the soft chemical assembly of metal-ion precursors and organic coordination ligands at the molecular level (Scheme 1). Firstly, CPNs with well-defined morphology were synthesized by soft chemical assembly of the metal ion and ptcda. The morphology of the CPNs can be elaborately controlled by the judicious choice of synthesis conditions, such as temperature, organic additives, reactant concentration, metal ions, and so forth. Then the metal-oxide nanoparticles with maintained morphology were formed; even the crystal-plane orientation was inherited from the pristine CPNs, by a simple thermal treatment process. The CPNs act as precursors for the formation of nanostructured metal oxides with maintained morphology through a template-engaged-quasi-topotactic, transformation process. This strategy is demonstrated to be a general and convenient approach to prepare metaloxide nanomaterials with controlled morphology and crystal planes.The zinc-ion-based CPNs, Zn-ptcda, were synthesized through the reaction of ptcda with ZnA C H T U N G T R E N N U N G (OAc) 2 in a sol...

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Section: Resultssupporting

confidence: 54%

Section: Resultsmentioning

confidence: 68%

Metal‐Oxide Nanoparticles with Desired Morphology Inherited from Coordination‐Polymer Precursors

Zhao

Sun

et al. 2012

Chemistry A European J

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“…This is further evidence that the broad emission observed originates from the ligand as has been previously observed from lanthanide complexes 27 Also visible in figure 3 are the characteristic Nd 3+ emission lines at ~900 nm, 1064 nm, and 1320 nm due to the 4 F 3/2 → 4 I 9/2 , 4 F 3/2 → 4 I 11/2 , and 4 F 13/2 → 4 I 9/2 transitions respectively. The relative strengths of the emission lines are typical to those observed in other Nd 3+ organolanthanide complexes 17,22,23,27 . In figure 3 (right) these emission lines have been plotted normalized to each other to allow the Stark splitting evident in the spectra to be clearly seen.…”

Section: Resultssupporting

confidence: 65%

The potential of pyridine-2,6-dicarboxylic acid based organolanthanide complexes for efficient near-infrared emission

Curry

George

Grossel

2005

Organic Light-Emitting Materials and Devices IX

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We present detailed spectroscopic data obtained from Nd pyridine-2,6-dicarboxylic acid based complexes in which the 4-position of the pyridine ring has been substituted with OH and Cl. In each case the ligands formed stable complexes with the Nd ion without the requirement for any additional 'neutral' ligand to satisfy the 8-9 coordination requirement of the lanthanide ion. Photoluminescence is observed from both the ligand (centered ∼700 nm) and the Nd ion (at ∼900 nm, 1064 nm, and 1320 nm due to the F → I, F → I, and F → I transitions respectively) following excitation in the low energy tail of the ligand π → π* absorption. The intensity of the ligand emission and sensitized Nd emission was found to be dependent on the substituted 4-position of the pyridine ring. The origin of the observed phenomena are discussed in relation to the energy transfer process from ligand to Nd ion and the non-radiative relaxation of the sensitized Nd ion. These results suggest that further modification of the ligand through complete halogenation and/or addition of other functional groups may provide an attractive route to obtaining an efficient near-infrared emitting organolanthanide complex

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“…[13] Because of the promising near-infrared luminescence properties of the quinolinates of trivalent erbium, ytterbium, and neodymium, interest in these materials has in-creased substantially in the last years, resulting in the appearance of several literature reports. [14][15][16][17][18][19][20] This paper is the first, however, to report on complexes of 8-hydroxy-5-nitroquinoline as near-infrared emitting materials. Introduction of the nitro group in the 5-position of the 8-hydroxyquinoline moiety changes its physical and chemical properties significantly.…”

Section: Resultsmentioning

confidence: 95%

Rare‐Earth Nitroquinolinates: Visible‐Light‐Sensitizable Near‐Infrared Emitters in Aqueous Solution

et al. 2007

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Keywords: Rare earth metals / Luminescence / Chelates / N,O ligands / Sensing Water-soluble, stable, and easily synthesizable 1:4 complexes of rare-earth ions with 8-hydroxy-5-nitroquinolinate ligands have been prepared. These complexes can be sensitized by visible light with wavelengths up to 480 nm and show nearinfrared emission in aqueous solution. The incorporation of a nitro group in the quinoline moiety shifts its absorption bands to longer wavelengths and also increases its molar absorp-

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Photosensitized Luminescence of Neodymium(III) Coordinated with 8-Quinolinolates in DMSO-d6

Cited by 41 publications

References 40 publications

Metal‐Oxide Nanoparticles with Desired Morphology Inherited from Coordination‐Polymer Precursors

Metal‐Oxide Nanoparticles with Desired Morphology Inherited from Coordination‐Polymer Precursors

The potential of pyridine-2,6-dicarboxylic acid based organolanthanide complexes for efficient near-infrared emission

Rare‐Earth Nitroquinolinates: Visible‐Light‐Sensitizable Near‐Infrared Emitters in Aqueous Solution

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