Novel silver() cluster-based coordination polymers as efficient luminescent thermometers

• Published in: CrystEngComm Vol. 23; no. 1; pp. 56 - 63
• Main Authors: Xue, Zhen-Zhen, Li, Xin-Yu, Xu, Lei, Han, Song-De, Pan, Jie, Wang, Guo-Ming
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 07.01.2021
• Subjects: Clusters; Coordination polymers; Crystal structure; Crystallography; Emission analysis; Emission spectra; Fluorescence; Ligands; Luminescence; Photoluminescence; Silver; Structural analysis; Temperature dependence; Thermometers; Triazoles
• ISSN: 1466-8033; 1466-8033
• DOI: 10.1039/d0ce01507e

By employing a triazole-pyridine-containing ligand, two novel coordination polymers with Ag( i ) clusters exhibiting different architectures have been successfully constructed. Structural analysis indicates that diverse coordination modes of the N-donor linker are responsible for the network difference for these two compounds, affording an isolated cluster for 1 and a 2D framework for 2 , respectively. Compound 1 features a butterfly-shaped [Ag 8 (bptp) 4 (H 2 O) 2 ] cluster wherein strong argentophilic interactions could be observed. The linkage of Ag( i ) with N and I centers gives rise to a tetranuclear building unit [Ag 4 (bptp) 3 I] in 2 , which is further extended to a 2D network with the assistance of the N-donor linkers. The syntheses and crystal structures have been investigated. Solid-state photoluminescence emissions as well as luminescence lifetimes of 1 and 2 have also been studied. Moreover, temperature-dependent luminescence tests show that an excellent linear relationship between temperature and emission intensity in the ranges of 77-298 K and 77-200 K could be observed for compounds 1 and 2 , respectively. The wide temperature sensing range especially for 1 implies that they could act as promising ratiometric fluorescence molecular thermometers. Two original Ag-based clusters with a multidentate N-containing organic linker have been constructed featuring temperature-dependent luminescence behavior.