2-Sülfoterfitalik Asit ve 4,4'-Bipiridin İçeren 2-Boyutlu Koordinasyon Bileşiğinin Yapısal ve Optik Özellikleri

Yıl 2019, , 103 - 113, 29.12.2019

Mustafa Burak Çoban , Hülya Kara Subaşat

https://doi.org/10.17100/nevbiltek.530931

Öz

Bu
çalışmada, iki farklı organik ligand içeren yeni bir tip iki-boyutlu
koordinasyon bileşiği, {(2-H₃stp)(4,4'-bipy)2.(H₂O)}_n,(2-H₃stp
=2-sülfoterfitalik asit ve 4,4'-bipy= 4,4'-bipiridin), hidrotermal yöntemle
sentezlendi ve tek kristal X ışını kristalografisi, toz kırınımı, UV-Vis
spektroskopisi ve katı hal fotolüminesans ölçümleri ile karakterize edildi.
Kristal yapı analizi bileşiğin triklinik kristal sistemi P-1 uzay grubunda
kristalleştiğini gösterir. Bileşiğin asimetrik birimi bir 2-sülfoterfitalik
asit,  iki 4,4'-bipiridin ve bir örgü su
moleküllerinden oluşmaktadır. Kristal yapıda her bir 2-H₃stp ligandı
güçlü O–H···N hidrojen bağları ile 4,4'-bipiridin molekülü ile etkileşim
içindedir. Yapı böylece tek-boyutlu zincir şeklinde büyümektedir. Ayrıca,
O–H···O, O–H···N hidrojen bağları ve yüz yüze π-π etkileşimler ile molekülleri
bir arada tutmaktadır. Sonuç olarak yapı iki-boyutlu bir forma sahip olur.
Ayrıca, bileşik ve onun ligandları sırasıyla oda sıcaklığında katı halde
şiddetli sarı-yeşil ve yeşil lüminesans sergiler. Bileşik, maksimum dalgaboyu
560 nm de olacak şekilde geniş yayma bandı gösterir. Bu geçiş muhtemelen  π -π * veya n-π * ligandlar arası elektronik
geçiş olabilir. Bu arada, bileşiğin ölçülen fotolüminesans spektrumunda,
serbest ligandlarla karşılaştırıldığında yaklaşık 50 nm kırmızıya kayma
gözlenmiştir. Böylece, bileşik sarımsı-yeşil ışık yayar. Bileşik, {(2-H₃stp)(4,4'-bipy)₂.(H₂O)}_n,
hem teknolojik hem de endüstriyel üretimde yapısal bir ara malzeme olarak
kullanılabilir. 

Anahtar Kelimeler

2-Sülfoterfitalik Asit, 4 4'-bipiridin, Koordinasyon bileşiği, Tek kristal analizi, Fotolüminesans özellikleri

Structural and Optical Properties of 2-Dimensional Coordination Compound Containing 2-Sulfoterephthalic Acid and 4,4'-Bipyridine

Öz

In this study, a new type 2D coordination compound
formulated as {(2-H₃stp)(4,4'-bipy)₂.(H₂O)}_n,
(2-H₃stp =2-sulfoterephthalic acid and 4,4'-bipy= 4,4'-bipyridine),
which included two different organic ligand, was synthesized via hydrothermal
method and characterized by single crystal X-ray crystallography, powder X-ray diffraction
(PXRD), UV-vis  and solid-state
photoluminescence measurements. The crystal structure analysis shows that
compound crystallizes in the triclinic space group P-1 and its asymmetric unit
of contains one 2-sulfoterephthalic acid, two 4,4'-bipyridine and one
coordinated water molecules. In this structure, each 2-H₃stp ligand
links to one 4,4'-bipy molecule with O–H···N hydrogen bonds and the structure
is expanding in the form of one-dimensional chain. Meanwhile, O–H···O, O–H···N
hydrogen bonds and face-to-face π–π interactions contact also connect the
molecules in the structure, resulting form to 2D. Furthermore, compound and its
ligand display an intense yellow and green light luminescence emission in the
solid-state at room temperature, respectively. The compound indicates broad
emission band at λ_max= 560 nm which may be assigned to the π-π* or
n-π* electronic transition intra-ligand charge transfer (ILCT). Meanwhile, the
photoluminescent measured of compound shows the about 50 nm red shift compared
free ligands. Thus, compound emits yellowish-green light. The compound, {(2-H₃stp)(4,4'-bipy)₂.(H₂O)}_n,
can be used as a structural intermediate material in both technological and
industrial production.

Anahtar Kelimeler

2-sulfoterephthalic acid, 4, 4'-bipyridine, Coordination compound, Single crystal analysis, , Photoluminescence properties

Kaynakça

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