Adem DÖNMEZ, Uğur ERKARSLAN, Şehmuz KARADENİZ

Evropiyum içeren lüminesans özelliği gösteren metal-organik malzemelerin üretimi ve yapılarının araştırılması

Molekül yapılarında birleştirici olarak ligand ve bağlayıcı olarak metal merkezler bulunan, uzaysal mimarisi özgün olan Metal organik çerçevelerin (MOÇ), moleküller arası uzaklıkları büyük olduğundan geniş hacimli boşluklara sahip olma özelliği ve yüzey alanlarının geniş olması nedeniyle manyetizma, lüminesans, hidrojen depolama, gaz absorbsiyonu, optik sensör gibi bir çok fiziksel/kimyasal/elektro-optik uygulama alanları mevcuttur. Bu çalışmada; Lantanit Metal Organik Çerçeveler içeren; [Eu(2-STP)], [2-STP=2-sülfoterefitalat] (1) hidrotermal yöntem ile sentezlenmiştir. Sentezlenen bu malzemenin yapısal analizi; Toz kristal X-ışını kırınımı, katı hal UV ve FT-IR spektroskopisi teknikleri kullanılarak açığa çıkartılmıştır. Malzemenin katı hal fotolüminesans özellikleri oda sıcaklığında görünür bölge ve yakın kızıl ötesi bölgede ölçülmüş ve “anten” görevi yapan 2-STP ligandın dan EuIII iyonuna enerji transfer mekanizması detaylı olarak tartışılmıştır.

Synthesis and structural analysis of europium metal-organic materials which show luminescence properties

Metal organic frameworks (MOFs), which is unique in spatial architecture and has ligands and metal centers as linkers and as a binding in molecular structures, due to their large intermolecular distances and their large surface area, they have many physical/chemical/electro-optic application areas such as magnetism, luminescence, hydrogen storage, gas absorption, optical sensor and so on. In this work; Lanthanide Metal Organic Frameworks; [Eu(2-STP)], (2-STP = 2-sulfoterephthalate) (1) were synthesized using hydrothermal method. The structural analysis of synthesized material has been characterized by powder X-ray diffraction, solid state UV and FT-IR spectra. The solid state photoluminescence properties of the material were measured at room temperature in visible and NIR region, and the energy transfer mechanism from 2-STP ligand to the central EuIII ion via an ‘‘antenna effect” was discussed in details.

Keywords:

MOF, luminescence, Europium,

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