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Lanthanide complexes with β-diketones and coumarin derivates:synthesis,thermal behaviour,optical and pharmacological properties and immobilisation

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Journal of Rare Earths 2010年第S1期28卷 66-74页

作者： Maria Milanova Joana Zaharieva Iliya Manolov Miroslava Getzova Dimitr To dorovsky Department of Inorganic Chemistry University of SofiaBulgaria 1J. Bourc hier Blvd.1164 SofiaBulgaria Department of Organic Chemistry Medical Un iversity2Dunav Str.1000 SofiaBulgaria

The paper presents the results of the synthesis of complexes of the ty pe Eu(DBM) 3 and Eu(DBM) 3·Q(DBM-dibenzoylmethane,Q-1,10-phenantroline or 4,7-d iphenyl-1,10-phenantroline) and of Tb-and Nd-complexes with the newly-synthesis ed coumarin derivates 3,3’-[(4-chlorphenyl) methylene) bis(4-hydroxy-2H-chromen-2-one) ,3,3’-[(3,5-dimethoxy-4-hydroxy) methylene) bis(4-hydroxy-2H-chromen-2-one) ,etc. Elemental and thermogravimetric analysis,IR,UV,NMR and fluorescence spe ctroscopy and X-ray analysis were applied for characterisation of the complexes. Some peculiarities of the synthetic procedures for both types of complexes were discussed and the influence of the synthetic approach,pH of the reaction mediu m,temperature of synthesis and drying of the complexes on the composition,stab ility and optical properties was reported. The immobilisation of the complexes i n thin films based on sol-gel produced SiO2 and on polymethylmethacrylate was st udied. The optimal conditions for preparation of the matrices(composition of th e starting system,temperature and time of sol aging,etc.) were recommended. Th e film morphology was evaluated by fluorescence,scanning electron and atomic fo rce microscopy. The interaction of the lanthanide ions with the matrices and the influence of their nature,the effect of the in-situ polymerisation and other f actors on photoluminescent excitation and emission spectra and excited state lif e-times of the complexes were followed. The effect of the second ligand on the p hotoluminescence properties of the immobilised diketonates was further elucidate d. Processes involved in the thermal decomposition of the complexes and microcom posites produced on their base were proposed. Preliminary results on the pharmac ological properties of the coumarin complexes reported showed unambiguously high er cytotoxicity of the Nd complex in comparison with that of the respective ligand.

关键词： rare earths complexes thin films β-diketones coumarin derivates optical properties pharmacological properties morphology

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Nitrite Ionic Liquids （IL-ONO and [bmim]NO2） as Effective Nitrosonium Sources for the Synthesis of a-Oximinoketones under Mild Heterogeneous Conditions

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Chinese Journal of Chemistry 2012年第1期30卷 163-166页

作者： Valizadeh，H Shomali, A. Gholipour, H. Department of Chemistry Faculty of Sciences Azarbao＇an University of Torbiat Moallem Tabriz Iran

Ketones and β-diketones were nitrosated and converted to their corresponding aoximinoketones using task-specific ionic liquids, l-（4-nitritobutyl）-3-methylimidazolium chloride, IL-ONO, and 1-butyl-3-methylimidazolium nitrite at room temperature. The results from two ionic liquids are comparable and showed that these IL＇s are effective nitrosonium sources for the preparation of oximinoketones. The protocol is rapid, the yields are excellent, and the method is simple.

关键词： β-diketones ketones malonodiamide oximinoketones ionic liquids

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PMA-SiO_2 catalyzed synthesis of β-keto enol ethers

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Chinese Chemical Letters 2008年第7期19卷 767-770页

作者： P.Srihari S.S.Mandal J.S.S.Reddy R.Srinivasa Rao J.S.Yadav Organic Division-I Indian Institute of Chemical TechnologyHyderabad 500007India

An efficient conversion of β-diketones into corresponding β-keto enol ethers with catalytic amount of PMA-SiO2 has been achieved.

关键词： β-Keto enol ethers β-diketones

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A STUDY ON THE SPECTRUM CHARACTER AND PHOTOSTABILIZATION ABILITY OF A NOVEL UV-ABSORBER-DIBENZOYL METHANE

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Chinese Journal of Polymer Science 1987年第1期5卷 7-11页

作者：吴世康戴光松刘鲁生 Institute of Photographic Chemistry Academia Sinica Beijing

The absorption and fluorescence spectra of dibenzoyl methane have been studied. From the absorption spectra it was found that there are two peaks locating at 252 nm and 340 nm, respectively, similar to that of o-hydroxy benzophenone which can form intra-molecular hydrogen bond. Besides, an uncommonly large Stoke’s shift of fluorescence can be observed in fluorescence spectra. The photostabilizing effects of dibenzoyl methane and UV-531 on the photodegradation of poly (cis-1, 4-butadiene) in solution have been investigated and compared. A possible mechanism was discussed.

关键词： β-diketones UV-absorber Photostabilizer Intra-molecular hydrogen bond

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