Two new alkaline earth metal organic frameworks with the diamino derivative of biphenyl-4, 4′-dicarboxylate as bridging ligand: Structures, fluorescence and quenching by gas phase aldehydes. (1st October 2018)

• Record Type: Journal Article
• Authors: Diamantis, Stavros A.; Pournara, Anastasia D.; Hatzidimitriou, Antonios G.; Manos, Manolis J.; Papaefstathiou, Giannis S.; Lazarides, Theodore
• Is Part Of: Polyhedron. Volume 153(2018)
• Page Start: 173
• Page End: 180
• Publication Date: 2018-10-01
• Subjects: Metal organic frameworks -- Alkaline earths -- Fluorescence -- Aldehydes -- Sensors; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2018.07.010
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: In this work we present two new fluorescent MOFs based on the alkaline earth metal ions Ca 2+ and Sr 2+ . The MOFs feature three dimensional networks which contain uncoordinated amino groups. In addition, both MOFs display bright blue fluorescence in the solid state. Their fluorescence is strongly quenched upon their interaction with gas phase aldehydes indicating that MOFs of this type may form the basis for the development of new aldehyde sensing platforms. Abstract: Alkaline earth metal ion organic frameworks (AEMOFs) represent a relatively underexplored subcategory of MOFs. Two new MOFs [Ca6 (bpdc-(NH2 )2 )5 (μ3 -HCO2 )2 (H2 O)2.5 (DMF)0.5 ]·0.5H2 O·2.5DMF (1 ) and [Sr4 (bpdc-(NH2 )4 )(μ2 -DMF)2 (DMF)1/3 ]·2/3(DMF) (2 ) [H2 bpdc-(NH2 )2 = 2, 2′-diamino-[1, 1′-biphenyl]-4, 4′-dicarboxylic acid); DMF = N, N-dimethylformamide] are presented here. These MOFs display structural variety with diverse topologies and new structural features. Luminescence studies revealed that both MOFs display ligand based fluorescence with small differences in emission profiles possibly attributable to the difference in charge density of the metal ions combined with the different conformation adopted by the ligand in the crystal structures of 1 and 2 . Furthermore, initial sensing studies reveal that both MOFs can potentially function as fluorescent sensors for gas phase aldehydes.