Gözenekli malzemelerde Pr(III) iyonlarının anten etkisi ile duyarlılaştırılması

Abstract

Metal organik çerçeveler (MOÇ) genellikle ligandlar ve metal iyonları ile oluşturulan gözenekli malzemelerdir.  Son zamanlarda, Ln(III) komplekslerinin fotolüminesans özellikleri alanında yapılan çalışmaların çoğu Eu(III), Tb(III), Dy(III) ve Sm(III) komplekslerine odaklanmıştır.  Araştırmalarımıza göre; özellikle Pr(III) komplekslerinin lüminesans özelliklerinin incelenmesi üzerine yapılan çalışmalar literatürde sınırlıdır.  Bu çalışmada, metal organik çerçeve elde etmek için Pr(III) metal iyonu seçilmiştir. f-f geçişlerinin yasaklı olması nedeniyle, lantanit (III) iyonlarının doğrudan uyarılması hemen hemen mümkün değildir.  Organik ligandların sağladığı anten etkisiyle lüminesans artışı daha etkili bir şekilde elde edilir.  Uygun bir ligandın seçimi veya anlamlı tasarımı, mükemmel lüminesans özelliklerini elde etmek için 3 boyutlu MOÇ'lerin oluşturulmasında önemli bir rol oynamaktadır.  Bu çalışmada Pr-MOÇ kompleksinin hem görünür hem de NIR bölgedeki lüminesans karakteristiği ile enerji transfer mekanizması incelenmiştir.

Keywords

• Metal organik çerçeve,gözenekli materyal,praseodim (III),fotolüminesans,anten etkisi

Sensitization of Pr(III) ions in porous material via an antenna effect

Abstract

Metal organic frameworks (MOF) are porous materials which generally construct with ligands and metal ions.  Recently, most of studies in the field of photoluminescence properties of Ln(III) complexes has been focused on Eu(III), Tb(III), Dy(III) and Sm(III) compounds.  In according to our research; investigation of luminescence properties of  specially Pr(III) complexes are limited report in literature.  In this study, Pr(III) metal ion has been selected to form the metal organic frameworks.  Because of forbidden f–f transitions, direct excitation of lanthanide (III) ions is nearly impossible.  The sensitization of organic ligands is more effectively achieved a via antenna effect.  To obtain excellent luminescence properties, the significant design or selection of a suitable ligand play a key role in the building of 3D-MOFs.  In this work, luminescence characteristics of the Pr-MOF complex both in visible and NIR region and energy transfer mechanism have been investigated.

Keywords

• Metal organic framework,porous material,praseodymium(III),photoluminescence,antenna effect

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