Computational elucidation of the aging time effect on zeolite synthesis selectivity in the presence of water and diquaternary ammonium iodide.

An example of zeolite selectivity (MFI → MOR) driven by synthesis aging time has been studied. Using ,,','-tetramethyl-,'-dipropyl-ethylenediammonium diiodide (TMDP) as an organic structure-directing agent (OSDA), the zeolite phases obtained at 2 h (MFI 97%), 8 h (MFI 84%, MOR 16%) and 24 h (MFI 43%, MOR 57%) have been characterized by powder X-ray diffraction. The results suggest that at intermediate aging time, namely 8 h and 24 h, the dominant phase (MFI) is displaced by MOR.

Three-dimensional organometallic thallium(I) supramolecular polymer nanostructures synthesized with sonochemical process.

A new three-dimensional thallium(I) supramolecular polymer, [Tl(μ-ATA)] (1), [HATA=2-aminoterephthalic acid] has been synthesized and characterized. The single-crystal X-ray data of compound 1 shows one type of Tl ion with a low coordination number. Compound 1 was self-assembled from Tl⋯C, Tl⋯O and Tl⋯N secondary interactions in thallium(I) coordination and the active lone pair on Tl in this compound may be involved in donor bonding.