Infrared Absorption of Metal Chelate Compounds of 1,3-Diketones<sup>1</sup>

Holtzclaw, Henry F.; Collman, James P.

doi:10.1021/ja01570a006

Cited by 134 publications

(27 citation statements)

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“…It is concluded from the above observations that the coordination bonds were formed between holmium and tfnd, holmium and dione (or dafone), respectively [21,22]. The strong bands in the range of 1000-1300 cm À 1 correspond to the vibrations of C-F bands [23]. The FTIR spectra of Pr1 and Pr2 and Tm1 and Tm2 are present in Fig.…”

Section: Ftir and Dr Spectramentioning

confidence: 77%

NIR-luminescence from ternary lanthanide [HoIII, PrIII and TmIII] complexes with 1-(2-naphthyl)-4,4,4-trifluoro-1,3-butanedionate

Dang

Wang

et al. 2011

Journal of Luminescence

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Section: Ftir and Dr Spectramentioning

confidence: 77%

NIR-luminescence from ternary lanthanide [HoIII, PrIII and TmIII] complexes with 1-(2-naphthyl)-4,4,4-trifluoro-1,3-butanedionate

Dang

Wang

et al. 2011

Journal of Luminescence

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“…[14] It is interesting to see that the stretching vibration frequency of CN in the ErDP gel has a red-shift to 1620 cm ±1 , which may suggest the possible coordination of Er±N. A new absorption band appears at 418 cm ±1 , which can be assigned to the stretch- ing band of Er±O, [13,15] even though it is not prominent (Fig. 2, inset).…”

Section: Infrared and Diffuse Reflectance Spectramentioning

confidence: 99%

A New Sol-Gel Material Doped with an Erbium Complex and Its Potential Optical-Amplification Application

et al. 2005

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The crystal structure of a ternary Er(DBM)3phen complex (DBM = dibenzoylmethane; phen = 1,10‐phenanthroline) and its in‐situ synthesis via a sol–gel process are reported. The infrared (IR), diffuse reflectance (DR), and fluorescence spectra of the pure complex and the Er3+/DBM/phen co‐doped luminescent hybrid gel, formed via an in‐situ method (ErDP gel), have been investigated. The results reveal that the erbium complex is successfully synthesized in situ in the ErDP gel. Excitation at the maximum absorption wavelength of the ligands resulted in the typical near‐IR luminescence (centered at around 1.54 μm) resulting from the 4I13/2 → 4I15/2 transition of the Er3+ ion, which contributes to the efficient energy transfer from the ligands to the Er3+ ion in both the Er(DBM)3phen complex and the ErDP gel (an antenna effect). The full width at half maximum (FWHM) centered at 1541 nm in the emission spectrum of the ErDP gel is 72 nm, which has potential for optical‐amplification applications. Further theoretical analysis on the Er3+ ion in the ErDP gel shows that it appears to be a promising candidate for tunable lasers and planar optical amplifiers.

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“…(b), the characteristic band at about 1720 cm −1 , which is ascribed to the imine group (C═N) vibration, can be observed . At the same time, a band at about 1578 cm −1 which is assignable to the vibration of acetylacetonate ring can be also seen in the spectrum of 0.7Co(acac) 2 APTS@SBA‐15 …”

Section: Resultsmentioning

confidence: 75%

Cobalt(II) acetylacetonate complex immobilized on aminosilane‐modified SBA‐15 as an efficient catalyst for epoxidation of trans‐stilbene with molecular oxygen

Tang

Wang

Zhang

et al. 2016

Applied Organom Chemis

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From environmental and economic points of view, it is highly desirable to develop a clean and efficient catalytic process to produce epoxides. An attractive approach is to use a solid, recyclable catalyst and molecular oxygen as the oxidant without any sacrificial reductant or other additives. Nonetheless, the catalysts reported up to now still cannot balance catalytic activity with epoxide selectivity. It is of great importance to explore novel catalysts with both high activity and selectivity for the epoxidation of olefins. In this work, cobalt(II) acetylacetonate (Co(acac)2) was covalently bonded to the silica surface of SBA‐15 molecular sieve by multi‐step grafting using 3‐aminopropytrimethoxysilane (APTS) as coupling agent. Characterizations with nitrogen physisorption, X‐ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy and thermogravimetric analysis suggested that the metal complex was successfully immobilized on the aminosilane‐modified SBA‐15 surface and the channel structure remained intact. The synthesized Co(acac)2APTS@SBA‐15 catalyst was used in the epoxidation of trans‐stilbene (TS) with molecular oxygen. Compared to the sample prepared by the impregnation method as well as Co(acac)2 solutions under the same reaction conditions, the Co(acac)2 immobilized catalyst exhibited remarkably higher TS conversion and trans‐stilbene oxide (TSO) selectivity. An increase in TS conversion with Co content was observed when the Co loading was lower than 0.70% and the 0.70Co(acac)2APTS@SBA‐15 sample exhibited the best catalytic performance. Up to 50.1% of TS conversion could be achieved within 6 h, affording TSO selectivity as high as 96.7%. The superior catalytic performance of this particular catalyst is attributed to the high activity of the immobilized Co(acac)2 species on SBA‐15. Copyright © 2016 John Wiley & Sons, Ltd.

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Infrared Absorption of Metal Chelate Compounds of 1,3-Diketones¹

Cited by 134 publications

References 0 publications

NIR-luminescence from ternary lanthanide [HoIII, PrIII and TmIII] complexes with 1-(2-naphthyl)-4,4,4-trifluoro-1,3-butanedionate

NIR-luminescence from ternary lanthanide [HoIII, PrIII and TmIII] complexes with 1-(2-naphthyl)-4,4,4-trifluoro-1,3-butanedionate

A New Sol-Gel Material Doped with an Erbium Complex and Its Potential Optical-Amplification Application

Cobalt(II) acetylacetonate complex immobilized on aminosilane‐modified SBA‐15 as an efficient catalyst for epoxidation of trans‐stilbene with molecular oxygen

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Infrared Absorption of Metal Chelate Compounds of 1,3-Diketones1

Cited by 134 publications

References 0 publications

NIR-luminescence from ternary lanthanide [HoIII, PrIII and TmIII] complexes with 1-(2-naphthyl)-4,4,4-trifluoro-1,3-butanedionate

NIR-luminescence from ternary lanthanide [HoIII, PrIII and TmIII] complexes with 1-(2-naphthyl)-4,4,4-trifluoro-1,3-butanedionate

A New Sol-Gel Material Doped with an Erbium Complex and Its Potential Optical-Amplification Application

Cobalt(II) acetylacetonate complex immobilized on aminosilane‐modified SBA‐15 as an efficient catalyst for epoxidation of trans‐stilbene with molecular oxygen

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Infrared Absorption of Metal Chelate Compounds of 1,3-Diketones¹