1610886-75-3Relevant academic research and scientific papers
Syntheses, structures, and photoluminescent properties of a series of metal-organic frameworks constructed by 5,5′-bis(1H-imidazol-1-yl)-2, 2′-bithiophene and various carboxylate ligands
Shi, Zhi-Qiang,Li, Yi-Zhi,Guo, Zi-Jian,Zheng, He-Gen
, p. 900 - 909 (2014)
A series of new metal-organic frameworks (MOFs), namely, {[Co(BIBP)(hfipbb)]}n (1), {[Co(BIBP)(Hbtc)]}n (2), {[Zn(BIBP)(5-OH-bdc)]}n (3), {[Cd(BIBP)(bdc)]}n (4), {[Zn2(BIBP)0.5(hfipbb)2]·H 2O}n (5), {[Zn4(BIBP)4(bdc) 4]}n (6), {[Zn(BIBP)(dl-ca)]·H2O} n (7), (BIBP = 5,5′-bis(1H-imidazol-1-yl)-2,2′- bithiophene, H2hfipbb = 4,4′-(hexafluoroisopropylidene) bis(benzoic acid), H3btc = 1,3,5-benzenetricarboxylic acid, H 2bdc = isophthalic acid, 5-OH-H2bdc = 5-hydroxyisophthalic acid, d-H2ca = d-camphor acid), have been hydrothermally synthesized. These compounds were structurally characterized by IR spectroscopy, elemental analysis and X-ray single-crystal diffraction. Compound 1 exhibits a 2D → 3D framework with an unusual parallel polycatenation of corrugated 2D (4,4) nets. Compounds 2-4 are structurally similar and display 2D layer structures, in which 2 and 3 extend into 3D supramolecular frameworks through interlayer O-H...O hydrogen-bonding interactions. Compound 5 displays a 3D 2-fold interpenetrating framework with a rare {44·6 6} sqp topology, containing an interesting ...LRLR... double helical layer structure. Compound 6 is a 2D network with {4 4·62}-sql topology and further extends via C-H...O hydrogen bonds into the 3D supramolecular framework. Compound 7 possesses a rare 3D non-interpenetrated cds-type framework with the Schlaefli symbol {65·8}. Thermal stabilities for 1-7 and photoluminescence properties of the compounds 3-7 have been examined in the solid state at room temperature. Furthermore, solid-state UV-vis spectroscopy experiments show that compounds 1-7 exhibit optical band gaps which are characteristic for optical semiconductors, with band gaps of 2.41, 2.44, 2.48, 2.46, 2.83, 2.68, and 2.72 eV, respectively.
