Ionothermal Syntheses, Crystal Structures and Luminescence of Two Lanthanide‐Carboxylate Frameworks based on the 1, 4‐Naphthalenedicarboxylate and Oxalate Mixed Ligands1. Issue 12 (19th August 2014)

• Record Type: Journal Article
• Authors: Gao, Ming‐Jun; Wang, Yu‐Ling; Cao, Hai‐Yan; Liu, Qing‐Yan; Chen, Li‐Li
• Is Part Of: Zeitschrift für anorganische und allgemeine Chemie. Volume 640:Issue 12/13(2014)
• Page Start: 2472
• Page End: 2476
• Publication Date: 2014-08-19
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1002/zaac.201400197
• Languages: English
• ISSNs: 0044-2313

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Ionothermal reactions of <italic>Ln</italic>(NO₃)₃ [<italic>Ln</italic> = Eu (<bold>1</bold>), Sm (<bold>2</bold>)] with 1, 4‐naphthalenedicarboxylic acid (1, 4‐H₂ndc) and oxalic acid (H₂ox) in 1‐ethyl‐3‐methylimidazolium bromide (EMIM‐Br) ionic liquid (IL) afforded two lanthanide compounds, namely, {(EMIM)[<italic>Ln</italic>(1, 4‐ndc)(ox)_0.5Br]}<italic>_n</italic> [<italic>Ln</italic> = Eu (<bold>1</bold>), Sm (<bold>2</bold>)]. The two isomorphous compounds consist of anionic three‐dimensional lanthanide‐carboxylate frameworks and extraframework charge‐balancing species of [EMIM]⁺ cations. Both compounds are 6‐connected <bold>pcu</bold> topological nets based on the dinuclear lanthanide secondary building units. It is noted that the cationic and anionic components of the IL are incorporated into the structures under the present ionothermal conditions. Moreover, the use of IL solvent for preparation of the lanthanide compounds can prevent the coordination of water and organic solvent molecules from central lanthanide atoms effectively. Detailed photoluminescence studies showed both compounds exhibit typical lanthanide luminescent emissions. An efficient excitation energy transfer from organic ligand‐to‐Eu^III ion is observed in compound <bold>1</bold>.</p> </abstract>