Search results for "Crystal"
showing 10 items of 22886 documents
CCDC 635391: Experimental Crystal Structure Determination
2009
Related Article: S.Bredeau, E.Ortega, G.Delmas, P.Richard, R.Frohlich, B.Donnadieu, G.Kehr, N.Pirio, G.Erker, P.Meunier|2009|Organometallics|28|181|doi:10.1021/om800512u
Phosphorus-Chalcogen Ring Expansion and Metal Coordination
2017
The reactivity of 4-membered (RPCh)2 rings (Ch = S, Se) that contain phosphorus in the +3 oxidation state is reported. These compounds undergo ring expansion to (RPCh)3 with the addition of a Lewis base. The 6-membered rings were found to be more stable than the 4-membered precursors, and the mechanism of their formation was investigated experimentally and by density functional theory calculations. The computational work identified two plausible mechanisms involving a phosphinidene chalcogenide intermediate, either as a free species or stabilized by a suitable base. Both the 4- and 6-membered rings were found to react with coinage metals, giving the same products: (RPCh)3 rings bound to the…
Zn2+ and Cu2+ complexes of a fluorescent scorpiand-type oxadiazole azamacrocyclic ligand: crystal structures, solution studies and optical properties
2020
A ligand comprised of a macrocyclic pyridinophane core having a pendant arm containing a secondary amine group linked through a methylene spacer to a pyridyl–oxadiazole–phenyl (PyPD) fluorescent system has been prepared (L). The crystal structures of [ZnL](ClO4)2 and [CuL](ClO4)2 show that M2+ is coordinated to all the nitrogen atoms of the macrocyclic core, the secondary amine of the pendant arm and the nitrogen atom of the pyridine group of the fluorescent moiety, the latter bond being clearly weaker than the one with the pyridine of the macrocycle. Solution studies showed the formation of a highly stable Cu2+ complex with 1 : 1 stoichiometry, whereas with Zn2+ least stable complexes were…
Heads or Tails? Sandwich-Type Metallocomplexes of Hexakis(2,3-di-O-methyl)-α-cyclodextrin
2020
Native and synthetically modified cyclodextrins (CDs) are useful building blocks in construction of large coordination complexes and porous materials with various applications. Sandwich-type complexes (STCs) are one of the important groups in this area. Usually, coordination of secondary hydroxyls or the “head” portal of native CD molecules to a notional multinuclear ring of metal cations leads to formation of head-to-head STCs. Our study introduces a new CD-ligand, hexakis(2,3-di-O-methyl)-α-cyclodextrin, which enables formation of intriguing head-to-head, but also novel tail-to-tail STCs. Homometallic silver-based head-to-head STCs, AgPF6-STC and AgClO4-STC, were obtained by coordination …
Decomposition Process of Carboxylate MOF HKUST-1 Unveiled at the Atomic Scale Level
2016
HKUST-1 is a metal-organic framework (MOF) which plays a significant role both in applicative and basic fields of research, thanks to its outstanding properties of adsorption and catalysis but also because it is a reference material for the study of many general properties of MOFs. Its metallic group comprises a pair of Cu2+ ions chelated by four carboxylate bridges, forming a structure known as paddle-wheel unit, which is the heart of the material. However, previous studies have well established that the paddle-wheel is incline to hydrolysis. In fact, the prolonged exposure of the material to moisture promotes the hydrolysis of Cu-O bonds in the paddle-wheels, so breaking the crystalline n…
CCDC 2149627: Experimental Crystal Structure Determination
2022
Related Article: Adrian Laviós, Amparo Sanz-Marco, Carlos Vila, M. Carmen Muñoz, José R. Pedro, Gonzalo Blay|2022|Org.Lett.|24|2149|doi:10.1021/acs.orglett.2c00427
CCDC 985005: Experimental Crystal Structure Determination
2014
Related Article: Frank Bohland, Irina Erlin, Lukas Platte, Maike Schröder, Dieter Schollmeyer, Udo Nubbemeyer|2014|Eur.J.Org.Chem.|2014|6272|doi:10.1002/ejoc.201402720
CCDC 1880603: Experimental Crystal Structure Determination
2018
Related Article: M.M. Abdou, M. Matziari, P.M. O'Neill, E. Amigues, R. Zhou, R. Wang, B.F. Ali|2018|IUCrData|3|x181662|doi:10.1107/S2414314618016620
CCDC 1825949: Experimental Crystal Structure Determination
2018
Related Article: Jacques Pliquett, Souheila Amor, Miguel Ponce-Vargas, Myriam Laly, Cindy Racoeur, Yoann Rousselin, Franck Denat, Ali Bettaïeb, Paul Fleurat-Lessard, Catherine Paul, Christine Goze, Ewen Bodio|2018|Dalton Trans.|47|11203|doi:10.1039/C8DT02364F
CCDC 1010853: Experimental Crystal Structure Determination
2014
Related Article: Linda Ta, Anton Axelsson, Joachim Bijl, Matti Haukka, Henrik Sundén|2014|Chem.-Eur.J.|20|13889|doi:10.1002/chem.201404288