NDLI: Synthesis, structure and oxygen-sensing properties of Iridium(III)-containing coordination polymers with different cations

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Ho, Mei-lin Lee, Gene-hsiang Sheu, Hwo-shuenn Chen, Tsai-chen Cheng, Kum-yi Chang, Pei-jen Shih, Chien-hung Chen, Yi-an Yu, Yi-ping
Description	Author Affiliation: Ho ML ( Department of Chemistry, Soochow University, Taipei, Taiwan. meilin_ho@scu.edu.tw)
Abstract	Four iridium(III)-containing coordination polymers 1–4 using $Ir(ppy)_{2}(H_{2}dcbpy)PF_{6}$ $(L-H_{2},$ ppy = 2-phenylpyridine , $H_{2}dcbpy$ = 4,4′-dicarboxy-2,2′-bipyridine ) as the bridging ligand , $[ZnL_{2}]·3DMF·5H_{2}O$ (1), $[CdL_{2}(H_{2}O)_{2}]·3DMF·6H_{2}O$ (2), $[CoL_{2}(H_{2}O)_{2}]·2DMF·8H_{2}O$ (3) and $[NiL_{2}(H_{2}O)_{2}]·3DMF·6H_{2}O$ (4), have been synthesized and structurally characterized. The emissions from 1–4 are ascribed to a metal-to- ligand charge transfer transition (MLCT). The absolute emission quantum yields for 1–4 in single crystals were measured in air to be 0.274, 0.193, 0.001 and 0.002, respectively. The noteworthy oxygen-sensing properties of 1–4 as well as $L-H_{2}$ in a single crystal were also evaluated. The Stern–Volmer quenching constant, $K_{SV}$ values, of 1–4 and $L-H_{2}$ can be deduced to be 0.834, 2.820, 1.328, 1.111 and 2.476, respectively. The results show promising $K_{SV}$ values (e.g.2) that are competitive or even larger than those of many known Ir-complexes. Moreover, the short response time (e.g. compound 2) and recovery times toward oxygen of 1–4 have been measured in their single crystal forms. The reversibility experiments for 1–4 were carried out for seven repeated cycles. As a result, >75% recovery of intensity for 1 and 2 on each cycle demonstrates a high degree of reproducibility during the sensing process. It should be noted that iridium(III)-containing coordination polymers with high emission intensity and notable oxygen sensing properties are obscure, especially in the single crystal form. This, in combination with its fine reversibility, leads to success in single crystal oxygen recognition based on photoluminescence imaging. The detection limit could be 0.50% for gaseous oxygen. Moreover, the temperature effect of compound 2 in a single crystal upon application as an oxygen sensor was expected.
ISSN	14779226
Issue Number	9
Journal	Dalton Trans.
Volume Number	41
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2012-03-07
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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