3 years ago

Structural diversity, single-crystal to single-crystal transformation and photocatalytic properties of Cu(II)-metal-organic frameworks based on 1,4-phenylenedipropionic acid

Structural diversity, single-crystal to single-crystal transformation and photocatalytic properties of Cu(II)-metal-organic frameworks based on 1,4-phenylenedipropionic acid
A series of four new copper(II) based metal-organic frameworks containing 1,4-phenylenedipropionic acid and different N,N′-donor coligands, namely, [Cu(ppa)(bpy)] n (1), {[Cu(ppa)(azp)(H2O)](H2O)} n (2), {[Cu(ppa)(tdp)(H2O)](H2O)2} n (3), and {[Cu(ppa)(tdp)](H2O)} n (4), (H2ppa=1,4-phenylenedipropionic acid, bpy=4,4′-bipyridine, azp=4,4′-azobipyridine, tdp=4,4′-thiodipyridine) have been successfully synthesized and structurally characterized by elemental analysis, IR, UV–vis, TGA, XRPD and single-crystal X-ray diffraction. Compound 1 containing a short and rigid bpy coligand displays a 2D square lattice (sql) topology while 2 and 3 which contain more flexible and longer azp and tdp coligands possess two-fold interpenetrating diamond-like ( dia ) 3D framework. Finally, the thermal-induced compound 4 is transformed from compound 3 by heating, through single-crystal-to-single-crystal transformation, adopting a CdSO4-like ( cds ) 3D framework. Additionally, the solid stated compounds 14 exhibit the energy band gaps of 3.50, 3.16, 3.53 and 3.31eV, respectively. Thus, the photocatalytic properties of 14 have been investigated. Approximately 84.9% for 1, 93.3% for 2, 82.0% for 3 and 85.4% for 4 of methylene blue were decomposed within 105min.

Publisher URL: www.sciencedirect.com/science

DOI: S0020169316307824

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