Tuning luminescence viatransition metal-directed strategy in coordination polymers

• Published in: CrystEngComm Vol. 16; no. 21; pp. 4422 - 4430
• Main Authors: Zhao, Fangfang, Dong, Huan, Liu, BeiBei, Zhang, Guangju, Huang, Hui, Hu, Hailiang, Liu, Yang, Kang, Zhenhui
• Format: Journal Article
• Language: English
• Published: 01.05.2014
• Subjects: Coordination polymers; Irradiation; Luminescence; Photoluminescence; Quenching; Strategy; Transition metals; Tuning
• ISSN: 1466-8033
• DOI: 10.1039/c3ce42566e

Six coordination polymers of transition metals, namely, Cu(bpy)(H sub(2)L) sub(2) (1), Co(bpy)(H sub(2)L) sub(2)(H sub(2)O) sub(2) (2), Mn(bpy)(H sub(2)L) sub(2)(H sub(2)O) sub(2) (3), Ag(bpy)(H sub(2)L) (4), Cd(bpy)(HL)(H sub(2)O) (5), and [Zn(bpy)(HL)].H sub(2)O (6) (bpy = 4,4'-bipyridine, H sub(3)L = 4-chloro-5-sulphamoylbenzoic acid), have been synthesized under hydrothermal conditions. Single crystal X-ray diffraction analysis reveals that these compounds exhibit 1D linear chains for 1-3 (2 and 3 are isomorphic), a 1D double chain for 4, a 2D square-grid sheet for 5 and a 3D window-shaped net for 6. Photoluminescent investigation shows that compounds 2-6 exhibit distinct tunable yellow-to-violet photoluminescence by varying the TMs. These five compounds show weak Co(ii)-based yellow, intense Mn(ii)-based blue, Ag(i)-based green, Cd(ii)-based violet and Zn(ii)-based violet luminescence upon irradiation with a standard UV lamp ( lambda sub(ex) = 254 nm) at room temperature. However, the Cu(ii)-based compound shows fluorescence quenching. Furthermore, the luminescent quantum yields (QYs) and lifetimes under UV irradiation of 2-6 as well as the H sub(3)L and bpy ligands have been obtained.