Molecular Self-Assembly of Group 11 Pyrazolate Complexes as Phosphorescent Chemosensors for Detection of Benzene

International Conference on Chemistry and Material Science 2017

化学;材料科学

Ghazalli, N.F.^1 ; Yuliati, L.^2,3,4 ; Lintang, H.O.^2,3,4

Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, UTM, Johor, Johor Bahru

81310, Malaysia^1

Centre for Sustainable Nanomaterials, Ibnu Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, UTM, Johor, Johor Bahru

81310, Malaysia^2

Ma Chung Research Center for Photosynthetic Pigments, Universitas Ma Chung, East Java, Malang

65151, Indonesia^3

Department of Chemistry, Faculty of Science and Technology, Universitas Ma Chung, East Java, Malang

65151, Indonesia^4

关键词: External stimulus;    Intermolecular interactions;    Metal-metal distances;    Metal-metal interactions;    Molecular self assembly;    Quenching phenomena;    Supramolecular assemblies;    Systematic study;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/299/1/012029/pdf
DOI  :  10.1088/1757-899X/299/1/012029

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

We highlight the systematic study on vapochromic sensing of aromatic vapors such as benzene using phosphorescent trinuclear pyrazolate complexes (2) with supramolecular assembly of a weak intermolecular metal-metal interaction consisting of 4-(3,5-dimethoxybenzyl)-3,5-dimethyl pyrazole ligand (1) and group 11 metal ions (Cu(I), Ag(I), Au(I)). The resulting chemosensor 2(Cu) revealed positive response to benzene vapors in 5 mins by blue-shifting its emission band in 44 nm (from 616 to 572 nm) and emitted bright orange to green, where this change cannot be recovered even with external stimuli. Comparing to 2(Ag) with longer metal-metal distance (473 nm) with same sensing time and quenching in 37%, 2(Au) gave quenching in 81% from its original intensity at 612 nm with reusability in 82% without external stimuli and emitted less emissive of red-orange from its original color. The shifting phenomenon in 2(Cu) suggests diffusion of benzene vapors to inside molecules for formation of intermolecular interaction with Cu(I)-Cu(I) interaction while quenching phenomenon in 2(Au) suggests diffusion of benzene vapors to between the Au(I)-Au(I) interaction. These results indicate that suitable molecular structure of ligand and metal ion in pyrazolate complex is important for designing chemosensor in the detection of benzene vapors.