Metal-organic framework assembled from erbium and a tetrapodal polyphosphonic acid organic linker
authors Mendes, RF; Firmino, ADG; Tome, JPC; Paz, FAA
nationality International
author keywords metal-organic frameworks; MOF; polyphosphonic acids; lanthanides; erbium; crystal structure
abstract A three-dimensional metal-organic framework (MOF), poly[[mu(6)-5'-pentahy-drogen [1,1'-biphenyl]-3,3',5,5'-tetrayltetrakis(phosphonato)]erbium(III)] 2.5-hydrate], formulated as [Er(C12H11O12P4)]center dot 2.5H(2)O or [Er(H(5)btp)]center dot 2.5H(2)O (I) and isotypical with a Y3+-based MOF reported previously by our research group [Firmino et al. (2017b). Inorg. Chem. 56, 1193-1208], was constructed based solely on Er3+ and on the polyphosphonic organic linker [1,1'-biphenyl]-3,3',5,5'-tetrakis(phosphonic acid) (H(8)btp). The present work describes our efforts to introduce lanthanide cations into the flexible network, demonstrating that, on the one hand, the compound can be obtained using three distinct experimental methods, i.e. hydro(solvo) thermal (Hy), microwave-assisted (MW) and one-pot (Op), and, on the other hand, that crystallite size can be approximately fine-tuned according to the method employed. MOF I contains hexacoordinated Er3+ cations which are distributed in a zigzag inorganic chain running parallel to the [100] direction of the unit cell. The chains are, in turn, bridged by the anionic organic linker to form a three-dimensional 6,6-connected binodal network. This connectivity leads to the existence of one-dimensional channels (also running parallel to the [100] direction) filled with disordered and partially occupied water molecules of crystalization which are engaged in O-H center dot center dot center dot O hydrogen-bonding interactions with the [Er(H(5)btp)] framework. Additional weak pi-pi interactions [intercentroid distance = 3.957 (7) angstrom] exist between aromatic rings, which help to maintain the structural integrity of the network.
issn 2053-2296
year published 2018
volume 74
beginning page 752
ending page 759
digital object identifier (doi) 10.1107/S2053229618007374
web of science category Chemistry, Multidisciplinary; Crystallography
subject category Chemistry; Crystallography
unique article identifier WOS:000434332200014
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