title: Luminescent microporous metal-organic framework with functional lewis basic sites on the pore surface: specific sensing and removal of metal ions.
abstract: A three-dimensional luminescent metal-organic framework, {Mg(DHT)(DMF)(2)}(n) (1), based on an excited-state intramolecular proton-transfer (ESIPT) responsive linker, 2,5-dihydroxyterephthalic acid (H(2)DHT), has been synthesized, and its desolvated microporous framework with pendent -OH groups on the pore surface was exploited for the binding and specific sensing of metal ions via Lewis acid-base interactions. The luminescence intensity significantly quenches with Cu(II) among various s- and d-block metal ions, and highly selective sensing of Cu(II) ions has been realized in both solid and solution states (up to nanomolar concentration). The immobilized Cu(II) metal ions can be selectively removed by chelating agents like ethylenediaminetetraacetic acid without any structural disintegration of the framework, as revealed by the luminescence and gas-adsorption studies.
authors.affiliation: Molecular Materials Laboratory, Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India.
authors.forename: Kolleboyina
authors.initials: K
authors.lastname: Jayaramulu
authors.forename: Raghu Pradeep
authors.initials: RP
authors.lastname: Narayanan
authors.forename: Subi J
authors.initials: SJ
authors.lastname: George
authors.forename: Tapas Kumar
authors.initials: TK
authors.lastname: Maji
mesh_terms: D000327:Adsorption; D003300:Copper / Q000032:analysis / Q000302:isolation & purification*; D058115:Lewis Bases / Q000737:chemistry*; D049408:Luminescent Agents / Q000737:chemistry*; D008163:Luminescent Measurements / Q000379:methods*; D008670:Metals / Q000032:analysis / Q000302:isolation & purification; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000737:chemistry*; D016062:Porosity; D012680:Sensitivity and Specificity
chemical_list: D058115:Lewis Bases; D049408:Luminescent Agents; D008670:Metals; D009942:Organometallic Compounds; D003300:Copper