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Procedure for the purification of alfa,omega diiodoperfluorinated compounds
No full textThe invention concerns a highly selective procedure for the separation and purification of alfa,omega-diiodioperfluoroalkanes of the formula I-(RF)-I, wherein RF is a perfluoralkyl group having from 2 to 10 carbon atoms.This applied also to complex industrial mixtures with very long diiodoperfluoroalkanes (from 8 to 16 carbon atoms)
FLUO 8-Supramolecular dynamic porous networks resolve mixtures of oligomeric alpha,omega-diiodoperfluoroalkanes in solution and through gas-solid reactions
No full textSolid state regiospecific photoreactions under supramolecular control by halogen bonding
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Dynamic Resolution of Diiodoperfluoroalkanes Mixtures by Halogen Bonded Non-porous Solids
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Dynamically Porous Organic Solids for the Selective Encapsulation of Diiodoperfluoroalkanes
No full textNonporous Organic Solids Capable of Dynamically Resolving Mixtures of Diiodoperfluoroalkanes
No full textHalogen bonding has increasingly facilitated the assembly of diverse host-guest solids. Here, we show that a well-known class of organic salts, bis(trimethylammonium) alkane diiodides, can reversibly encapsulate α,ω-diiodoperfluoroalkanes (DIPFAs) through intermolecular interactions between the host's I– anions and the guest's terminal iodine substituents. The process is highly selective for the fluorocarbon that forms an I–···I(CF2)mI···I– superanion that is matched in length to the chosen dication. DIPFAs that are 2 to 12 carbons in length (common industrial intermediates) can thereby be isolated from mixtures by means of crystallization from solution upon addition of the dissolved size-matched ionic salt. The solid-state salts can also selectively capture the DIPFAs from the vapor phase, yielding the same product formed from solution despite a lack of porosity of the starting lattice structure. Heating liberates the DIPFAs and regenerates the original salt lattice, highlighting the practical potential for the system in separation applications
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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