Abstract A 3D CdII-based metal–organicframework, [CdLeneN3]n (namely complex 1), was prepared by heating CdCl2, NaN3, and 4-(4-cyanostyryl)pyridine (L) in a mixed solution of i-PrOH and H2O at 165 °C for 72 h. Interestingly, cyano and azide groups can react with each other in suit to generate tetrazolate groups during the synthetic process, which can be confirmed by the singlecrystal X-ray diffraction analysis
Photodimerization behaviour of 1D–3D Zn(<scp>ii</scp>) coordination polymers with tetrazolyl styrylpyridine
作者:Yu-Bo Shu、Na Tu、Hua-Tian Shi、Ye-Gao Yin、Wei-Sheng Liu
DOI:10.1039/c5dt00614g
日期:——
The [2 + 2] photodimerization of tetrazolyl styrylpyridine leads to single-crystal-to-single-crystaltransformations of four Zn(II) coordinationpolymers with 1D–3D structures, exhibiting controllable reaction extent, luminescence decrease or blue shift, and a two-step reaction process with a phase transition point.
Comparison of Templating Abilities of Urea and Thioruea During Photodimerization of Bipyridylethyelene and Stilbazole Crystals
作者:Balakrishna R. Bhogala、Burjor Captain、Vaidhyanathan Ramamurthy
DOI:10.1111/php.12353
日期:2015.5
AbstractPhotodimerization of cocrystals of four bispyridylethylenes and two stilbazoles with urea as a template in the solid state has been investigated following our success with thiourea. Four investigated olefins photodimerized quantitatively to a single dimer in the crystalline state only. The reactivity of urea–olefin crystals is understood on the basis of their packing arrangements in the crystalline state. In reactive crystals the adjacent reactive molecules are within 4.2 Å and parallel, whereas the unreactive ones have their adjacent molecules are farther than 4.6Å and nonparallel. Thus, with the knowledge of crystal packing the reactivity of urea–olefin crystals is predictable on the basis of Schmidt's topochemical postulates. The templating property of urea, similar to thiourea, derives from its ability to form hydrogen bonds with itself and the guest olefins. Despite the similarities in molecular structures of urea and thiourea their subtle electronic properties, yet to be fully understood, affect the crystal packing and consequently their reactivity in the crystalline state. Further work is needed to fully exploit the templating properties of urea.
[2+2] Photodimerization of Stilbazoles Promoted by Oxalic Acid in Suspension
waxy or even insoluble stilbazoles. Moreover, the oxalicacid loading could be lowered to sub-stoichiometric amounts. When further optimizations were needed, our strategy was found to be highly flexible to identify other oligocarboxylic acids as alternative additive to improve or even overturn regioselectivity. Oxalicacid and other oligocarboxylic acids were found to be capable of orienting more than