New metal-organic frameworks (MOFs) based on zinc and cadmium ions, terephthalic acid, and flexible ligands 1,5-bis(imidazol-1-yl)pentane or 1,6-bis(imidazol-1-yl)hexane were prepared and characterized by X-ray diffraction, thermorgavimetric analysis and IR spectroscopy. The imidazolyl ligands were prepared by a new robust procedure involving the reaction between imidazole and 1,5-dibromopentane or 1,6-dibromohexane in a superbasic medium (KOH in DMSO). MOFs based on 1,5-bis(imidazol-1-yl)pentane had diamond topology (dia) and are triply interpenetrated. Ligands with longer spacer 1,6-bis(imidazol-1-yl)hexane, terephthalate ions and zinc(II) ions formed five-fold interpenetrated metal-organic framework also with dia topology, while cadmium(II) ions with the same ligands formed eight-connected uninodal net with a very rare self-penetrated topological type ilc and a point symbol 4 24 .5.6 3 . The influence of the chemical composition of MOFs on their photoluminescent properties is investigated and discussed in detail.
We have formulated and developed a route for the synthesis of sulfur-containing heterocycles based on the interaction of sulfenyl chlorides with unsaturated compounds which occurs by ring closure at the nucleophilic center of the sulfenyl unit [1-6].In the current work reactions of 3,3-dimethyl-1-butene (1) with the hetarenesulfenyl chlorides 2a-d which contain a potentially nucleophilic nitrogen atom in the hetaryl unit: 4,6-dimethylpyrimidine-2-(2a), 3-cyano-4,6-dimethylpyridine-2-(2b), quinoline-8-(2c), and 1,3-benzothiazole-2-sulfenyl chloride (2d). S-Het Cl N N Me Me N Me Me CN N S N t-Bu 1 + Het-SCl 2a-d t-Bu 2, 3 a Het = b Het = c Het = d Het = , , ,
3a-dWith the help of 1 H NMR spectroscopy it was established that addition products at the double bond contrary to Markovnikov's rule -the corresponding β-chlorosulfides 3a-d -were obtained rapidly and with quantitative yield from compounds 2a-d and the alkene 1 at 20°C.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.