Gözenekli malzemelerde Pr(III) iyonlarının anten etkisi ile duyarlılaştırılması

Yıl 2017, Cilt: 19 Sayı: 3, 50 - 57, 07.12.2017

Melek Özdaş Bütün

https://doi.org/10.25092/baunfbed.363760

Cited By: 1

Öz

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.

Anahtar Kelimeler

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

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

Öz

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.

Anahtar Kelimeler

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

Kaynakça

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